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Journal articles on the topic 'Operational transconductance amplifier (OTA)'

Author: Grafiati

Published: 4 June 2021

Last updated: 25 July 2025

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1

Sanchotene Silva, Rafael, Luís Henrique Rodovalho, Jefferson Luiz Brum Marques, and Cesar Ramos Rodrigues. "A 59 pA/V and 62 nW Differential OTA with 0.35% THD for Biomedical Applications." Journal of Integrated Circuits and Systems 16, no. 2 (2021): 1–11. http://dx.doi.org/10.29292/jics.v16i2.490.

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This paper presents a novel differential pA/V Operational Transconductance Amplifier (OTA) topology. The circuit is suitable for the implementation of fully integrated operational transconductance amplifier-capacitance (OTA-C) filters with small feature size capacitors, suited for electrophysiological signal acquisition and conditioning. Unlike typical OTA-Cs, the proposed topology consists of transconductance reduction technique based on unbalanced output branches thatallow current subtraction thus enabling transconductances in the order of pA/V. The technique is demonstrated through the desi

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2

Dubey, Tanmay, Vijaya Bhadauria, and Rishikesh Pandey. "Linearity Enhancement Techniques for Operational Transconductance Amplifier: A Survey." Recent Advances in Electrical & Electronic Engineering (Formerly Recent Patents on Electrical & Electronic Engineering) 13, no. 5 (2020): 650–68. http://dx.doi.org/10.2174/2352096512666191019130214.

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Background: Operational Transconductance Amplifier (OTA) plays an essential role in many analog and mixed-signal applications that encourages the researchers to contribute their work to design suitable structures of OTA for their applications with acceptable performance parameters. Methods: The linearity of an OTA is one of its key performance parameters, which affects the performance of the overall system whereas the transconductance value of OTA (Gm) contributes to decide its application area. Low transconductance OTA finds its application in biomedical and neural networks while OTA with hig

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3

Abuelma'atti, Muhammad Taher, and Muhammad Haroon Khan. "Grounded Capacitor Oscillators Using A Single Operational Transconductance Amplifier." Active and Passive Electronic Components 19, no. 2 (1996): 91–98. http://dx.doi.org/10.1155/1996/17943.

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New oscillator circuits using operational transconductance amplifiers (OTAs) are presented. Each circuit uses a single OTA and grounded capacitors. The feasibility of obtaining oscillators with independent control of frequency and oscillation is considered. Also, the feasibility of exploiting, to advantage, the frequency dependence of the OTA-transconductance is considered. This may result in OTA-based RC oscillators using only one externally-connected capacitor.

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4

Vasudeva, G., and Mandar Jatkar. "Design of High Performance Operational Transconductance Amplifier." ACS Journal for Science and Engineering 3, no. 2 (2023): 21–30. http://dx.doi.org/10.34293/acsjse.v3i2.81.

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Designing high-performance analog circuits is becoming increasingly challenging with the persistent trend toward reduced supply voltages. The main bottleneck in an analog circuit is the operational amplifier. At large supply voltages, there is a trade off among speed, power, and gain, amongs to ther performance parameters. Often these parameters present contradictory choices for the op-amp architecture. At reduced supply voltages, output swing becomes yet another performance metric to be considered when designing the opamp. Of the several architecture folded cascode OTA is used in which all th

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5

Li, Xiang, Bo Hou, Chunge Ju, Qi Wei, Bin Zhou, and Rong Zhang. "A Complementary Recycling Operational Transconductance Amplifier with Data-Driven Enhancement of Transconductance." Electronics 8, no. 12 (2019): 1457. http://dx.doi.org/10.3390/electronics8121457.

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An improved operational transconductance amplifier (OTA) is presented in this work. The fully differential OTA adopts the current recycling technique and complementary NMOS and PMOS input branches to enhance the total transconductance. Moreover, in order to achieve higher current efficiency, a data-driven biasing circuit was developed to dynamically adjust the power consumption of the amplifier. Two comparators were added to detect the voltage difference at the input nodes, and when the differential input is large enough to activate either comparator, extra biasing current is activated and pou

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6

Kotha, Sreeteja Reddy, Karuppanan P, Abhay Kumar Gautam, and Manmath Suryavanshi. "A 0.25-V Three-stage State Feedback Bulk-driven OTA for Wide Range Load Applications." Journal of Integrated Circuits and Systems 16, no. 3 (2021): 1–9. http://dx.doi.org/10.29292/jics.v16i3.498.

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This article employs a nested state feedback compensation technique to a three-stage bulk-driven operational transconductance amplifier (OTA). The projected OTA circuit consists of a bulk-driven PMOS amplifier, gate-driven NMOS amplifier, and common source (CS) amplifier. The entire transistors in the amplifier core are configuredwith self-cascode transistor topology to increase its output impedance. All transistors are designed to operate in a weak inversion in order to dissipate less power. Cross-coupled transistor pair topology in the bulk-driven stage allows to improve the effective transc

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7

Sarin, Mythry, A.Gayathri, Farheen Saieemah, N.Jeenath, M.Sowmya, and P.Sahith. "Design of Low Power Operational Transconductance Amplifier for Biomedical Applications." International Journal of Applied Control, Electrical and Electronics Engineering (IJACEEE) 3, no. 2 (2020): 15–21. https://doi.org/10.5281/zenodo.3975519.

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This paper presents the design of folded cascode operational transconductance amplifier (OTA). This design has been implemented in 0.18um CMOS Technology using Cadence. Spectre simulation shows that the OTA has flat gain of 47dB from 1Hz to 100 KHz frequency, indicating stability of OTA, noise ranges as 22.49769nV/ at 10Hz to 66.89128fV/ at 1MHz and average power as 0.770mW. In this paper, we will be studying the design concepts, analysis of operational transconductance amplifier which is used for recording the bio signals. This paper plays a key role in real time applications for equipment de

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8

GHORI, A., and P. GHOSH. "ANALYSIS OF OPERATIONAL TRANSCONDUCTANCE AMPLIFIER FOR APPLICATION IN GHz FREQUENCY RANGE." International Journal of High Speed Electronics and Systems 14, no. 03 (2004): 690–95. http://dx.doi.org/10.1142/s0129156404002685.

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Operational Transconductance Amplifier (OTA) is an excellent current mode device suited very well for VLSI implementation. In this contribution we report realization of OTA using Silicon-On-Insulator (SOI) structure based MOSFETs and compared them to OTA designed with bulk MOSFET. SOI based OTA outperformed bulk MOSFET OTA giving close to 10 GHz improvement in high frequency f T . A band-pass filter was implemented with SOI based OTA with a center frequency of 7 GHz and a bandwidth of 480 kHz.

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9

Vardhan, K. Vijaya, K. Malathi Santhoshini, Sarada Musala, and V. N. Lakshmi Pabbisetty. "Schmitt Trigger Circuits using Various Active Devices." International Journal of Engineering and Advanced Technology 9, no. 1s5 (2019): 143–46. http://dx.doi.org/10.35940/ijeat.a1035.1291s519.

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A vast number of diverse analog circuit blocks have been arosed in the past few decades. A various active devices are Operational Amplifier (Op-Amp), Current Conveyor (CC), Operational Transconductance Amplifier (OTA), Differential Difference Current Conveyor (DDCC), Differential Difference Current Conveyor Transconductnace Amplifier (DDCCTA), Z-Copy Current Differencing Transconductance Amplifier (ZC-CDTA), Voltage Difference Transconductance Amplifier (VDTA) and so on. A review on Schmitt trigger circuits by using different active devices are presented in this paper since Schmitt trigger cir

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10

Krolák, David, and Pavel Horský. "An EMI susceptibility study of different integrated operational transconductance amplifiers." Journal of Electrical Engineering 74, no. 1 (2023): 13–22. http://dx.doi.org/10.2478/jee-2023-0002.

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Abstract This paper presents a comparative EMI susceptibility study of different integrated operational transconductance amplifier (OTA) topologies. We analyzed conventional well-known amplifier topologies based on the Miller OTA and folded cascode concepts with lower power consumption. The output dc voltage shifts induced by power supply and input common mode high frequency disturbances are presented. On top of the EMI susceptibility comparison, we discuss PSRR and CMRR within large and small excitation signal with a new simulation setup. Even more, the back-gate connections of differential M

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11

de Araujo, Gustavo Vinicius, Joao Martino, and Paula Agopian. "Operational Transconductance Amplifier Designed with Experimental Omega-Gate Nanowire SOI MOSFETs." ECS Meeting Abstracts MA2023-01, no. 33 (2023): 1861. http://dx.doi.org/10.1149/ma2023-01331861mtgabs.

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The nanowire omega-gate technology is one of the possible technologies to replace the FinFET one in the semiconductor chip market. The omega-gate nanowire SOI MOSFET is considered a triple plus gate device, near the gate-all-around performance (figure 1) [1]. Due to the omega gate structure this device presents a better gate to channel electrostatic coupling than the FinFET devices, resulting in a greater immunity to short channel effects [1,2]. The Operational Transconductance Amplifier (OTA) is a frequently used analog block in the integrated circuits. The studied OTA consists in a two-stage

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12

Rajesh, Durgam, Subramanian Tamil, Nikhil Raj, and Bharti Chourasia. "Low-voltage bulk-driven flipped voltage follower-based transconductance amplifier." Bulletin of Electrical Engineering and Informatics 11, no. 2 (2022): 765–71. http://dx.doi.org/10.11591/eei.v11i2.3306.

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A low voltage high performance design of operational transconductance amplifier is proposed in this paper. The proposed architecture is based on bulk driven quasi-floating gate metal oxide semiconductor field effect transistor (MOSFET) which supports low voltage operation and improves the gain of the amplifier. Besides to this the tail current source requirement of operational transconductance amplifier (OTA) is removed by using the flipped voltage follower structure at the input pair along with bulk driven quasi-floating gate MOSFET. The proposed operational transconductance amplifier shows a

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13

Rajesh, Durgam, Tami Subramanian, Raj Nikhil, and Chourasia Bharti. "Low-voltage bulk-driven flipped voltage follower-based transconductance amplifier." Bulletin of Electrical Engineering and Informatics 11, no. 2 (2022): 765–71. https://doi.org/10.11591/eei.v11i2.3306.

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A low voltage high performance design of operational transconductance amplifier is proposed in this paper. The proposed architecture is based on bulk driven quasi-floating gate metal oxide semiconductor field effect transistor (MOSFET) which supports low voltage operation and improves the gain of the amplifier. Besides to this the tail current source requirement of operational transconductance amplifier (OTA) is removed by using the flipped voltage follower structure at the input pair along with bulk driven quasi-floating gate MOSFET. The proposed operational transconductance amplifier shows a

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14

Akbari, Meysam, and Omid Hashemipour. "Multi-Path Class AB Operational Amplifier with High Performance for SC Circuits." Journal of Circuits, Systems and Computers 25, no. 11 (2016): 1650144. http://dx.doi.org/10.1142/s0218126616501449.

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In this paper, a single-stage multi-path operational transconductance amplifier (OTA) with fast-settling response for high performance applications is designed. The produced amplifier uses current-shunt technique, double recycling structure, cross-coupled positive feedback configuration and all idle devices in the signal path to enhance transconductance of the conventional folded cascode (FC) amplifier. These transconductance boosting techniques lead to higher DC gain, gain bandwidth (GBW), slew rate and lower settling time compared to the previous FC structures while phase margin is degraded.

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15

de Araujo, Gustavo Vinicius, Joao Martino, and Paula Agopian. "Operational Transconductance Amplifier Designed with Experimental Omega-Gate Nanowire SOI MOSFETs." ECS Transactions 111, no. 1 (2023): 191–95. http://dx.doi.org/10.1149/11101.0191ecst.

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Operational Transconductance Amplifier (OTA) designed with Omega-gate Nanowire SOI MOSFETs was evaluated. The transistor model was created using Verilog-A language and a Look-Up Table strategy, which is based on very precise measurements of the fabricated device. For the model, both the current and capacitance responses were considered. The proposed OTA showed a very good results with a voltage gain of 69.5 dB and a gain–bandwidth product (GBW) of 724 MHz. After that, a comparison among OTAs using different technologies was performed, showing that although the OTA designed with omega gate nano

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16

Bouzerara, Lyes, and Mohand Belaroussi. "Low-voltage 0.35-/mi cmos wideband operational transconductance amplifier." Facta universitatis - series: Electronics and Energetics 15, no. 3 (2002): 361–69. http://dx.doi.org/10.2298/fuee0203361b.

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A low voltage CMOS wideband operational Tran conductance amplifier (OTA) using regulated cascade structure with an active positive feedback frequency-dependent current mirrors and feed forward techniques, is presented and analyzed. Such techniques stand as a powerful method of gain bandwidth, output impedance and phase margin enhancements. In this paper, an efficient implementation of a high output impedance current mirror is used in the design of an OTA by means of the regulated cascade circuits. This amplifier operates at ?1.25 V power supply voltage, exhibits a voltage gain of 68 dB, and pr

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17

Su, C., B. J. Blalock, S. K. Islam, L. Zuo та L. M. Tolbert. "A High-Temperature Folded-Cascode Operational Transconductance Amplifier in 0.8-μm BCD-on-SOI". Additional Conferences (Device Packaging, HiTEC, HiTEN, and CICMT) 2010, HITEC (2010): 000083–88. http://dx.doi.org/10.4071/hitec-csu-ta26.

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The rapid growth of the hybrid electric vehicles (HEVs) has been driving the demand of high temperature automotive electronics target for the engine compartment, power train, and brakes where the ambient temperature normally exceeds 150°C. An operational transconductance amplifier (OTA) is an essential building block of various analog circuits such as data converters, instrumentation systems, linear regulators, etc. This work presents a high temperature folded cascode operational transconductance amplifier designed and fabricated in a commercially available 0.8-μm BCD-on-SOI process. SOI proce

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18

Ahmad, Shadab, Mahaveer Singh Naruka, and Lidia Shanti Singavarapu. "UNVEILING THE POTENTIAL OF AN IMPROVED RECYCLING FOLDED CASCODE AMPLIFIER FOR CMOS OPERATIONAL TRANSCONDUCTANCE AMPLIFIER DESIGN AND OPTIMIZATION." ICTACT Journal on Microelectronics 9, no. 2 (2023): 1557–61. https://doi.org/10.21917/ijme.2023.0271.

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This paper presents the investigation and optimization of a Recycling Folded Cascode Amplifier (RFCA) for designing a highly efficient and high-performance CMOS Operational Transconductance Amplifier (OTA). The proposed RFCA architecture leverages recycling techniques to enhance the overall gain, linearity, and power efficiency of the OTA. By analyzing the operational principles of the RFCA and exploring various optimization strategies, this study unveils the significant potential of this improved architecture in the context of CMOS OTA design. Simulation results demonstrate superior performan

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19

Abuelma'atti, Muhammad Taher, and Sa'ad Muhammad Al-Shahrani. "Synthesis of a Novel Low-Component Programmable Sinusoidal Oscillator." Active and Passive Electronic Components 26, no. 1 (2003): 31–36. http://dx.doi.org/10.1155/apec.26.31.

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A novel circuit is presented for realizing a sinusoidal oscillator. The proposed circuit, developed through a true synthesis approach, uses one current-feedback operational amplifier (CFOA), one operational transconductance amplifier (OTA), three grounded capacitors and one floating resistor. The proposed circuit enjoys several attractive features. Practical results, in excellent agreement with the presented theory, are included.

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20

Rahul, Singh, and Chandra Singh Chauhan Ram. "Power Efficient Biquadratic Filter designing using OTA." Indian Journal of Science and Technology 14, no. 29 (2021): 2448–59. https://doi.org/10.17485/IJST/v14i29.2293.

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Abstract <strong>Objectives:</strong> To present a power efficient Universal Biquad Operational Transconductance Amplifier circuit. <strong>Methods:</strong> OTA (operational transconductance amplifier) based Biquad filter is analyzed using three different simulated tools three different tools (CADENCE, XILINX, ORCAD and MATLAB tools) are used for designing the circuit. The 0.18mm CMOS technique is used using the Cadence tool for plan and reproduction. The same circuit has been implemented on ORCAD tool as well as Xilinx tool. <strong>Findings:</strong> The proposed Bi

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21

D, Pruthvi, and Dr Kiran V. "Design of Two stage OTA with Optimised Compensation Capacitance." International Journal of Research and Review 9, no. 11 (2022): 60–65. http://dx.doi.org/10.52403/ijrr.20221109.

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A two-stage operational transconductance amplifier is constructed and compared between 45nm and 180nm CMOS technology in this paper. To find the best design, the suggested operational amplifier is examined across a number of distinct parameters. With a supply voltage of 1.8V, it reaches a maximum gain of about 66 dB and a phase margin of 82°. A Cadence Virtuoso-based circuit simulator has been used to construct the suggested operational amplifier and the comparison is done. Keywords: OTA, Miller coupling capacitance, cadence virtuoso, Gain, output swing, power dissipation.

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22

Vasudeva, Gowdagere, and Bidikinamane Venkataramanaiah Uma. "Operational transconductance amplifier-based comparator for high frequency applications using 22 nm FinFET technology." International Journal of Electrical and Computer Engineering (IJECE) 12, no. 2 (2022): 2158–68. https://doi.org/10.11591/ijece.v12i2.pp2158-2168.

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Fin field-effect transistor (FinFET) based analog circuits are gaining importance over metal oxide semiconductor field effect transistor (MOSFET) based circuits with stability and high frequency operations. Comparator that forms the sub block of most of the analog circuits is designed using operational transconductance amplifier (OTA). The OTA is designed using new design procedures and the comparator circuit is designed integrating the sub circuits with OTA. The building blocks of the comparator design such as input level shifter, differential pair with cascode stage and class AB amplifier fo

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23

Wu, Chunkai, Peng Cai, Jinghu Li, Jin Xie, and Zhicong Luo. "Power-Efficient Recycling Folded Cascode Operational Transconductance Amplifier Based on Nested Local Feedback and Adaptive Biasing." Sensors 25, no. 8 (2025): 2523. https://doi.org/10.3390/s25082523.

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In this paper, we present a novel enhanced recycling folded cascode (ERFC) operational transconductance amplifier (OTA), which exhibits high efficiency and a fast transient response under weak inversion. Our innovative combination of adaptive biasing with nested local feedback (ABNLF) effectively enhances the input transconductance and slew rate (SR), thus improving the transient response. By incorporating coupling capacitors at the output stage, we achieve a stable operating region with large signal responses. Both the traditional RFC OTA and the proposed ERFC OTA were designed in a 0.18 μm C

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24

Kumngern, Montree, Fabian Khateb, Tomasz Kulej, and Boonying Knobnob. "1 V Tunable High-Quality Universal Filter Using Multiple-Input Operational Transconductance Amplifiers." Sensors 24, no. 10 (2024): 3013. http://dx.doi.org/10.3390/s24103013.

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This paper presents a new multiple-input single-output voltage-mode universal filter employing four multiple-input operational transconductance amplifiers (MI-OTAs) and three grounded capacitors suitable for low-voltage low-frequency applications. The quality factor (Q) of the filter functions can be tuned by both the capacitance ratio and the transconductance ratio. The multiple inputs of the OTA are realized using the bulk-driven multiple-input MOS transistor technique. The MI-OTA-based filter can also offer many filtering functions without additional circuitry requirements, such as an inver

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25

Halesh M R, Pavan S, and Pappuru Tejaswini. "Implementation of OTA in 90nm Technology with Bandgap Reference Application." September 2023 5, no. 3 (2023): 307–19. http://dx.doi.org/10.36548/jei.2023.3.005.

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Operational Transconductance Amplifier (OTA) is the basic building block of Analog circuit with linear input/output characteristics. Because it associates closely linked parameters like noise and settling performance, the current design methodologies for two-stage OTAs frequently result in sub-optimal solutions. The study discusses the implementation of an Operational transconductance amplifier (OTA) with a bandgap reference (BGR) circuit and its importance in providing a stable and accurate reference voltage for various analog and digital circuits. The combination of OTA and BGR provides a st

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26

Gowdagere, Vasudeva, and Uma Bidikinamane Venkataramanaiah. "Operational transconductance amplifier-based comparator for high frequency applications using 22 nm FinFET technology." International Journal of Electrical and Computer Engineering (IJECE) 12, no. 2 (2022): 2158. http://dx.doi.org/10.11591/ijece.v12i2.pp2158-2168.

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<p><span>Fin field-effect transistor (FinFET) based analog circuits are gaining importance over metal oxide semiconductor field effect transistor (MOSFET) based circuits with stability and high frequency operations. Comparator that forms the sub block of most of the analog circuits is designed using operational transconductance amplifier (OTA). The OTA is designed using new design procedures and the comparator circuit is designed integrating the sub circuits with OTA. The building blocks of the comparator design such as input level shifter, differential pair with cascode stage and

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27

Huang, Xiao Zong, Lun Cai Liu, Jian Gang Shi, et al. "Low Power Operational Transconductance Amplifier (OTA) with Enhanced DC Gain and Slew-Rate." Applied Mechanics and Materials 411-414 (September 2013): 1645–48. http://dx.doi.org/10.4028/www.scientific.net/amm.411-414.1645.

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This paper presents a low-voltage differential operational transconductance amplifier (OTA) with enhanced DC gain and slew-rate. Based on the current mirror OTA topology, the optimization techniques are discussed in this work. The proposed structure achieves enhanced DC gain, unit gain frequency (UGF) and slew-rate (SR) with adding four devices. The design of the OTA is described with theory analysis. The OTA operates at the power supply of 1.8V. Simulation results for 0.18μm standard CMOS technology show that the DC gain increases from 60.6dB to 65dB, the UGF is optimized from 2.5MHz to 4.3MH

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28

Alsibai, Ziad, and Salma Bay Abo Dabbous. "Ultra-Low-Voltage Low-Power Bulk-Driven Quasi-Floating-Gate Operational Transconductance Amplifier." Advances in Electronics 2014 (August 27, 2014): 1–7. http://dx.doi.org/10.1155/2014/402840.

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A new ultra-low-voltage (LV) low-power (LP) bulk-driven quasi-floating-gate (BD-QFG) operational transconductance amplifier (OTA) is presented in this paper. The proposed circuit is designed using 0.18 μm CMOS technology. A supply voltage of ±0.3 V and a quiescent bias current of 5 μA are used. The PSpice simulation result shows that the power consumption of the proposed BD-QFG OTA is 13.4 μW. Thus, the circuit is suitable for low-power applications. In order to confirm that the proposed BD-QFG OTA can be used in analog signal processing, a BD-QFG OTA-based diodeless precision rectifier is des

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Ibarra, F. Sandoval, V. H. Arzate Palma, and S. D. Cárdenas Castellón. "Design of a Fully Differential CMOS OTA Folded Cascode for Modulation." International Journal of Emerging Technology and Advanced Engineering 10, no. 11 (2020): 1–6. http://dx.doi.org/10.46338/ijetae1120_01.

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In this paper, the design and experimental results of a fully-differential folded-cascode operational amplifier of transconductance (OTA) is presented. This active circuit is for the use in a  low-pass modulator. The structure of the OTA is for obtaining a transition frequency of 1.0GHz. From the circuit synthesis, the OTA can handle the signals with the peak-to-peak amplitude of 300mV, and consumes 1.5mA from 1.2V supply. The OTA is fabricated in 130nm standard CMOS technology.

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30

Yin, Yue, Xinbing Zhang, Ziting Feng, et al. "An Ultra-Low-Voltage Transconductance Stable and Enhanced OTA for ECG Signal Processing." Micromachines 15, no. 9 (2024): 1108. http://dx.doi.org/10.3390/mi15091108.

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In this paper, a rail-to-rail transconductance stable and enhanced ultra-low-voltage operational transconductance amplifier (OTA) is proposed for electrocardiogram (ECG) signal processing. The variation regularity of the bulk transconductance of pMOS and nMOS transistors and the cancellation mechanism of two types of transconductance variations are revealed. On this basis, a transconductance stabilization and enhancement technique is proposed. By using the “current-reused and transconductance-boosted complementary bulk-driven pseudo-differential pairs” structure, the bulk-driven pseudo-differe

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31

Jayachandran, Remya, Dhanaraj Jagalchandran, and Perinkolam Chidambaram Subramaniam. "Planar CMOS and multigate transistors based wide-band OTA buffer amplifiers for heavy resistance load." Facta universitatis - series: Electronics and Energetics 35, no. 1 (2022): 13–28. http://dx.doi.org/10.2298/fuee2201013j.

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Analog buffer amplifier configurations capable of driving heavy resistive load using different operational transconductance amplifier (OTA) are presented in this paper. The OTA CMOS buffer configurations are designed using 0.18 ?m SCL technology library in Cadence Virtuoso tool and multigate transistor OTA buffer in TCAD Sentaurus tool. CMOS OTA buffer configuration using simple OTA outperform the OTA buffer circuits using other OTAs in terms of power dissipation and stability. Measured results show that the OTA buffer circuit works well for resistive load below 100 ?. The gain tuning of up to

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32

SU, HSIAO WEI, and YICHUANG SUN. "HIGH-FREQUENCY LINEAR MULTIPLE-OUTPUT CMOS TRANSCONDUCTANCE AMPLIFIER FOR CURRENT-MODE FILTERS." Journal of Circuits, Systems and Computers 15, no. 05 (2006): 701–17. http://dx.doi.org/10.1142/s0218126606003325.

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A high-frequency highly linear tunable CMOS multiple-output operational transconductance amplifier (MO-OTA) for fully balanced current-mode OTA and capacitor (OTA-C) filters is presented. The MO-OTA is based on the cross-coupled pairs at the input and provides two pairs of differential outputs. A simple common-mode feedback (CMFB) circuit to stabilize the DC output levels of the MO-OTA is also proposed and two such CMFB circuits are used by the MO-OTA. The proposed MO-OTA is suitable for relatively low voltage (2.5 V) applications as its circuit has only two MOS transistors between the supply

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33

Choi, Jaesuk, Soon-Jae Kweon, and Hyuntak Jeon. "Single-Stage CMOS Operational Transconductance Amplifiers (OTAs): A Design Tutorial." Electronics 12, no. 18 (2023): 3833. http://dx.doi.org/10.3390/electronics12183833.

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This paper presents a comprehensive design tutorial for four types of single-stage operational transconductance amplifiers (OTAs): (1) five-transistor OTAs, (2) telescopic cascode OTAs, (3) folded cascode OTAs, and (4) current mirror OTAs. These OTAs serve as fundamental building blocks in analog circuits. The operational principles of each OTA are reviewed, and the key performance metrics are derived through a hand analysis. These performance metrics encompass most crucial parameters, including small-signal parameters, frequency response, input and output swing ranges, rising and falling slew

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Sozen, Hasan, and Ugur Cam. "A Novel Floating/Grounded Meminductor Emulator." Journal of Circuits, Systems and Computers 29, no. 15 (2020): 2050247. http://dx.doi.org/10.1142/s0218126620502473.

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Meminductor is a nonlinear two-terminal element with storage energy and memory ability. To date, meminductor element is not available commercially as memristor and memcapacitor are. Therefore, it is of great significance to implement a meminductor emulator for breadboard experiment. In this paper, a flux-controlled floating/grounded meminductor emulator without a memristor is presented. It is built with commercially available off-the-shelf electronic devices. It consists of single operational transconductance amplifier (OTA), single multiplier, two second-generation current conveyors (CCIIs),

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Abuelma'atti, Muhammad Taher, and Azhar Quddus. "Programmable CF-OTA-Based Lowpass and Bandpass Filters." Active and Passive Electronic Components 18, no. 4 (1995): 267–72. http://dx.doi.org/10.1155/1995/20370.

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A new circuit is proposed for realizing lowpass and bandpass filter responses. The circuit uses one current-follower and one operational transconductance amplifier. The circuit enjoys low temperature sensitivities, high input impedance and its important parameters are electronically programmable. The use of grounded capacitors is an additional attractive feature for integration. Simulation results confirming the theory presented are included.

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36

Rezaei, Farzan, and Seyed Javad Azhari. "Analysis and Design Procedure of a Novel Low Power Highly Linear Operational Transconductance Amplifier." Journal of Circuits, Systems and Computers 24, no. 05 (2015): 1550071. http://dx.doi.org/10.1142/s0218126615500711.

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In this paper, a new highly linear operational transconductance amplifier (OTA) is presented. Proposed OTA employs two linearization techniques of cross-coupled double differential pairs and resistive source degeneration to achieve highly linear response under low power consumption. Considering the linearity and the frequency response issues as main parameters of OTA in the communication circuits, design procedure is theoretically formulated for the best linearity and optimum frequency compensation. Proposed OTA is simulated in 0.18-μm TSMC CMOS technology by Hspice simulator. While, the power

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37

Xuan, Zhengnan. "A High Gain, Low Power Operational Transconductance Amplifier Capable of Recording and Processing ECG Signals." Highlights in Science, Engineering and Technology 111 (August 19, 2024): 96–107. http://dx.doi.org/10.54097/1r077194.

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Based on high output resistor current mirrors and differential pair inputs, a new operational transconductance amplifier (OTA) is designed in this paper that can collect, filter, denoise and amplify electrocardiogram (ECG) signals. The OTA is designed on a 0.18μm CMOS process with a supply voltage of 1.8V. In this experiment, the ECG signal generated by the human model is first simulated, which has a noise of 50 Hz from electromagnetic interference, especially the electrical power lines. The differential input pair is then connected to the model, and it is proved that it can denoise the common

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Ali, Haitham K., and Jihan S. Abdaljabar. "Analysis and Simulation of Active Filters Using Operational Transconductance Amplifier (OTA)." European Scientific Journal, ESJ 13, no. 15 (2017): 170. http://dx.doi.org/10.19044/esj.2017.v13n15p170.

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As the transistors are continuously scaling down, it becomes necessary to reduce voltage supply and power requirements of the circuit to increase its performance and stability. Whereas, current- mode devices require less number of stages with high output impedance results in improved performance and large bandwidth as compared to voltage-mode techniques. OTA are current-mode device that takes voltage as input and produces current as output with high gain and large bandwidth. The frequency bands were parameters were determined such as the cutoff frequency (fc), the band width (BW), the quality

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Jarjar, Mariem, and EL Ouazzani Nabih Pr. "Design of active inductor-based butterworth and chebyshev microwave bandpass filters in standard 0.18µm-CMOS technology." TELKOMNIKA Telecommunication, Computing, Electronics and Control 8, no. 1 (2019): 27–35. https://doi.org/10.11591/ijres.v8.i1.pp27-35.

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In this paper we propose a synthesis of microwave active filters having Butterworth and Chebyshev responses in the frequency range 1GHz-2GHz. The filter fundamental block, used to build an active inductor, consists of CMOS-based Operational Transconductance Amplifier (OTA) circuits. These amplifiers are made out of simple current mirror using MOS transistors. The simulation procedure has been carried out through PSPICE software showing good performances regarding scattering parameters in terms insertion losses, of out-of-band rejection and phase.

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Ballo, Andrea, Alfio Dario Grasso, and Salvatore Pennisi. "0.4-V, 81.3-nA Bulk-Driven Single-Stage CMOS OTA with Enhanced Transconductance." Electronics 11, no. 17 (2022): 2704. http://dx.doi.org/10.3390/electronics11172704.

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The paper describes a single-stage operational transconductance amplifier suitable for very-low-voltage operation in power-constrained applications. The proposed circuit avoids the tail current generator in the differential pair while preventing pseudo-differential operation. Moreover, the adoption of positive feedback allows increasing the stage transconductance while minimizing the current consumption. Experimental measurements on prototypes implemented in a standard CMOS 180-nm technology, show superior performance as compared to the state of the art.

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Marani, Roberto, and Anna Gina Perri. "EFFECT OF TEMPERATURE IN THE DESIGN OF AN OPERATIONAL TRANSCONDUCTANCE AMPLIFIER BASED ON CNTFET." International Journal of Advances in Engineering & Technology (IJAET) 14, no. 5 (2021): 71–77. https://doi.org/10.5281/zenodo.5652351.

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<em>In this paper we analyse the impact of temperature variations in the design of an Operational Transconductance Amplifier (OTA) based on CNTFET, where the active load is a cascode current sink mirror. In particular we  determine the Voltage Transfer Characteristics (VTCs) and the Common Mode Rejection Ratio (CMRR) at different temperatures.</em>

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42

Wise, Cross T. Asha, G. R. Suresh, M. Palanivelen, and S. Saraswathi. "Design of Pentacene-Based Organic Field-Effect Transistor for Low-Frequency Operational Transconductance Amplifier." Journal of Circuits, Systems and Computers 29, no. 11 (2020): 2050181. http://dx.doi.org/10.1142/s0218126620501819.

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Mounting electronics circuits on a plastic flexible substrate are pertinent for biosensing applications due to their resilient nature, minimal processing conditions, lightweight and low cost. Organic Field-Effect Transistors (OFET)-based amplifier for flexible biosensors have been proposed in this paper. To design flexible biosensing circuits, Metal Oxide Semiconductor Field-Effect Transistor (MOSFET) with Polycyclic Hydrocarbon is a suitable choice. It is a big challenge to build an organic circuit using graphene electrode due to its poor performance of [Formula: see text]-type OFET, therefor

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Al-Ali, Abdulrahman Khalaf, Muhammad Taher Abuelma'atti, and Rizwan Ali Tiwana. "Programmable OTA-Based Multifunction Active Filter." Active and Passive Electronic Components 17, no. 1 (1994): 21–27. http://dx.doi.org/10.1155/1994/10413.

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A fully programmable multifunction filter is presented. The filter uses four operational transconductance amplifiers and two capacitors. Analog switches are used to control the filter transfer function through a microcontroller. The user is provided control over the cutoff (or centre) frequency of the filter by controlling the auxiliary bias currents of the operational transconductance amplifiers via digital-to-analog converters. The circuit can simultaneously provide three programmable transfer functions in a single structure and can realize all the standard second-order filters. The circuit

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Kwak, Joon Young, and Sung-Yun Park. "Compact Continuous Time Common-Mode Feedback Circuit for Low-Power, Area-Constrained Neural Recording Amplifiers." Electronics 10, no. 2 (2021): 145. http://dx.doi.org/10.3390/electronics10020145.

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A continuous-time common-mode feedback (CMFB) circuit for low-power, area-constrained neural recording amplifiers is proposed. The proposed CMFB circuit is compact; it can be realized by simply replacing passive components with transistors in a low-noise folded cascode operational transconductance amplifier (FC-OTA) that is one of the most widely adopted OTAs for neural recording amplifiers. The proposed CMFB also consumes no additional power, i.e., no separate CMFB amplifier is required, thus, it fits well to low-power, area-constrained multichannel neural recording amplifiers. The proposed C

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Kwak, Joon Young, and Sung-Yun Park. "Compact Continuous Time Common-Mode Feedback Circuit for Low-Power, Area-Constrained Neural Recording Amplifiers." Electronics 10, no. 2 (2021): 145. http://dx.doi.org/10.3390/electronics10020145.

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A continuous-time common-mode feedback (CMFB) circuit for low-power, area-constrained neural recording amplifiers is proposed. The proposed CMFB circuit is compact; it can be realized by simply replacing passive components with transistors in a low-noise folded cascode operational transconductance amplifier (FC-OTA) that is one of the most widely adopted OTAs for neural recording amplifiers. The proposed CMFB also consumes no additional power, i.e., no separate CMFB amplifier is required, thus, it fits well to low-power, area-constrained multichannel neural recording amplifiers. The proposed C

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46

Mariem, Jarjar, and Pr EL Quazzani Nabih. "Design of active inductor-based butterworth and chebyshev microwave bandpass filters in standard 0.18µm-CMOS technology." International Journal of Reconfigurable and Embedded Systems (IJRES) 8, no. 1 (2019): 27. http://dx.doi.org/10.11591/ijres.v8.i1.pp27-35.

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<p>In this paper we propose a synthesis of microwave active filters having Butterworth and Chebyshev responses in the frequency range 1GHz-2GHz. The filter fundamental block, used to build an active inductor, consists of CMOS-based Operational Transconductance Amplifier (OTA) circuits. These amplifiers are made out of simple current mirror using MOS transistors. The simulation procedure has been carried out through PSPICE software showing good performances regarding scattering parameters in terms insertion losses, of out-of-band rejection and phase.</p>

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Akbari, Meysam, and Omid Hashemipour. "High Gain and High CMRR Two-Stage Folded Cascode OTA with Nested Miller Compensation." Journal of Circuits, Systems and Computers 24, no. 04 (2015): 1550057. http://dx.doi.org/10.1142/s0218126615500577.

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By using Gm-C compensation (GCC) technique, a two-stage recycling folded cascode (FC) operational transconductance amplifier (OTA) is designed. The proposed configuration consists of recycling structure, positive feedback and feed-forward compensation path. In comparison with the typical folded cascode CMOS Miller amplifier, this design has higher DC gain, unity-gain frequency (UGF), slew rate and common mode rejection ratio (CMRR). The presented OTA is simulated in 0.18-μm CMOS technology and the simulation results confirm the theoretical analyses. Finally, the proposed amplifier has a 111 dB

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Aparecido da Silva Braga, Rodrigo, Paulo Marcio Moreira e Silva, and Dean Bicudo Karolak. "Are CMOS Operational Transconductance Amplifiers Old Fashioned? A Systematic Review." Journal of Integrated Circuits and Systems 17, no. 1 (2022): 1–7. http://dx.doi.org/10.29292/jics.v17i1.574.

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Operational Transconductance Amplifiers (OTAs) are essential building blocks in analog circuits. Since the early years of integrated circuit science, OTAs have been used in industry and researched in academia. Over the years, a number of techniques and approaches to OTA design have been observed in the literature. With this systematic review, we aim to provide a overview of top journal papers published from 2017 to 2021 containing OTA design. In our investigation we initially found 128 manuscripts and 24 primary studies of OTA design. A set of 10 different techniques have been found. Furthermo

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Sanchotene Silva, Rafael, Luis Henrique Rodovalho, Orazio Aiello, and Cesar Ramos Rodrigues. "A 1.9 nW, Sub-1 V, 542 pA/V Linear Bulk-Driven OTA with 154 dB CMRR for Bio-Sensing Applications." Journal of Low Power Electronics and Applications 11, no. 4 (2021): 40. http://dx.doi.org/10.3390/jlpea11040040.

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In this paper, a new technique for improvement on the DC voltage gain, while keeping the high-linearity in symmetrical operational transconductance amplifier (OTA) bulk-driven (BD) topology is proposed. These features are achieved by allying two topological solutions: enhanced forward-body-biasing self-cascode current mirror, and source degeneration. The proposed concept is demonstrated through simulations with typical process parameters and Monte Carlo analysis on nominal transistors of the CMOS TSMC 180 nm node. Results indicate that the proposed OTA can achieve a very small transconductance

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Abuelma'atti, Muhammad Taher. "Novel CCI-OTA-Based Grounded Capacitor Current-Mode Biquadratic Bandpass and Lowpass Filters." Active and Passive Electronic Components 16, no. 2 (1994): 127–33. http://dx.doi.org/10.1155/1994/17485.

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A novel current-mode active filter topology using a first generation current conveyor (CCI) and an operational transconductance amplifier (OTA) is presented. Using this topology, grounded-capacitor biquadratic bandpass and lowpass filter sections, with at most five one-port passive elements, are realized. In these realizations, the parameterω0can be adjusted without disturbing the parameterω0/ Q0

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