Relevant bibliographies by topics / PWM-audio amplifier

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  1. Journal articles
  2. Dissertations / Theses
  3. Book chapters
  4. Conference papers

Academic literature on the topic 'PWM-audio amplifier'

Author: Grafiati
Published: 4 June 2021
Last updated: 18 February 2022

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Journal articles on the topic "PWM-audio amplifier"

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Cox, S. M., C. K. Lam, and M. T. Tan. "A second-order PWM-in/PWM-out class-D audio amplifier." IMA Journal of Applied Mathematics 78, no. 2 (July 27, 2011): 159–80. http://dx.doi.org/10.1093/imamat/hxr042.

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LIN, CHUN-WEI, and BING-SHIUN HSIEH. "THE MULTILEVEL TECHNIQUE FOR IMPROVING FILTERLESS CLASS-D AUDIO AMPLIFIERS." Journal of Circuits, Systems and Computers 23, no. 04 (April 2014): 1450047. http://dx.doi.org/10.1142/s0218126614500479.

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Class-D amplifier features very high efficiency on power delivery because its switching operation consumes tiny static power on very low on-resistance. In this work, a multilevel technique is presented to improve total-harmonic-distortion (THD) and signal-to-noise-ratio (SNR) of pulse-width-modulation (PWM) filterless class-D amplifiers. The proposed method consists of a multilevel converter and a time division adder (TDA) followed by PWM modulator. The PWM-modulated signal is arranged into several time divisions and then integrated and encoded to a set of parallel control signals for multilevel converter. Instead of the two-level PWM signal, the output signal of a multilevel converter is as stairway with less transient variation. The performance of THD and SNR are therefore improved because the instantaneous variation of signal is greatly reduced. To demonstrate the proposed method, a filterless audio amplifier was implemented by TSMC 5 V–0.35 μm CMOS technology. With 8 Ω speaker and 550 mW maximum power, experiment results show that the THD, SNR and power efficiency can be achieved over 0.02%, 85 dB and 85%, respectively.
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Zhangming, Zhu, Liu Lianxi, Yang Yintang, and Lei Han. "A high efficiency PWM CMOS class-D audio power amplifier." Journal of Semiconductors 30, no. 2 (February 2009): 025001. http://dx.doi.org/10.1088/1674-4926/30/2/025001.

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Murtianta, Budihardja. "PENGUAT KELAS D DENGAN METODE SUMMING INTEGRATOR." Elektrika 11, no. 2 (October 8, 2019): 12. http://dx.doi.org/10.26623/elektrika.v11i2.1693.

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A class D amplifier is one in which the output transistors are operated as switches. When a transistor is off, the current through it is zero and when it is on, the voltage across it is small, ideally zero. Thus the power dissipation is very low, so it requires a smaller heat sink for the amplifier. Class D amplifier operation is based on analog principles and there is no digital encoding of the signal. Before the emergence of class D amplifiers, the standard classes were class A, class AB, class B, and class C. The classic method for generating signals driving a transistor MOSFET is to use a comparator. One input is driven by an incoming audio signal, and the other by a triangle wave or a sawtooth wave at the required switching frequency. The frequency of a triangular or sawtooth wave must be higher than the audio input. MOSFET transistors work in a complementary manner that operates as a switch. Triangle waves are usually generated by square waves fed to the integrator circuit. So the main part of processing audio signals into PWM (Pulse Width Modulation) is the integrator and comparator. In this paper, we will discuss the work of a class D amplifier system using the summing integrator method as its main part.
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Liu, Zi Yi, Xing Xing Jing, and Wen Xi. "Design of a Sawtooth Generator Applied for Class-D Audio Power Amplifier." Applied Mechanics and Materials 241-244 (December 2012): 693–97. http://dx.doi.org/10.4028/www.scientific.net/amm.241-244.693.

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A systematic introduction to principles and advantages of the class-D audio amplifier based on pulse width modulation (PWM) are presented in this paper. The traditional sawtooth generator needs voltage-regulator tube to server as a core component. Against to such a disadvantage a simple way based on the charging and discharging capacitance is proposed to achieve sawtooth generator. The circuit design is based on SIMC 0.18um process. Spectre simulation results show that the sawtooth generator's performance is good. And it suits for the design of class-D audio power amplifier chip.
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Luo, Shumeng, and Dongmei Li. "A digital input class-D audio amplifier with sixth-order PWM." Journal of Semiconductors 34, no. 11 (November 2013): 115001. http://dx.doi.org/10.1088/1674-4926/34/11/115001.

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Kołodziejski, Wojciech, Stanisław Kuta, and Jacek Jasielski. "Open-Loop Class-BD Audio Amplifiers with Balanced Common-Mode Output." Electronics 10, no. 12 (June 9, 2021): 1381. http://dx.doi.org/10.3390/electronics10121381.

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This paper presents new architectures and implementations of original open-loop Class-BD audio amplifiers with balanced Common-Mode output. The output stage of each proposed amplifier includes the typical H-bridge with four MOSFETs and four additional MOSFET switches that balance and keep the Common-Mode output constant. The presented amplifiers employ the extended NBDD PWM or PSC PWM modulation scheme. When the output stage is built only on NMOSFET transistors, gate drivers require a floating power supply, using a self-boost charge pump with capacitive isolation of the control signal. The use of complementary MOSFETs in the output stage greatly simplifies gate control systems. The proposed amplifiers were compared to the typical Class-BD configuration, using the optimal NBDD modulation with respect to audio performance of the Differential-Mode (DM) and Common-Mode (CM) outputs. Basic SPICE simulations and experimental studies have shown that the proposed Class-BD amplifiers have similar audio performance to the prototype with the optimal NBDD modulation scheme, while at the same time having a balanced constant voltage CM output, thus eliminating the main contributor to radiation emission. As a result, the filtering of the DM output signals can be greatly simplified, while the filtering of the CM output signals can be theoretically eliminated. Practically, due to the timing errors added by the gate drivers, spikes are generated at the CM output, which are very easy to filter out by the reduced LC output filter, even at very low L.
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Wing-Hong Lau, H. S. H. Chung, C. M. Wu, and F. N. K. Poon. "Realization of digital audio amplifier using zero-voltage-switched PWM power converter." IEEE Transactions on Circuits and Systems I: Fundamental Theory and Applications 47, no. 3 (March 2000): 303–11. http://dx.doi.org/10.1109/81.841913.

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Adduci, Pietro, Edoardo Botti, Enrico Dallago, and Giuseppe Venchi. "PWM Power Audio Amplifier With Voltage/Current Mixed Feedback for High-Efficiency Speakers." IEEE Transactions on Industrial Electronics 54, no. 2 (April 2007): 1141–49. http://dx.doi.org/10.1109/tie.2007.892610.

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Kaczmarek, Michal, and Piotr Kaczmarek. "Comparison of the Wideband Power Sources Used to Supply Step-Up Current Transformers for Generation of Distorted Currents." Energies 13, no. 7 (April 10, 2020): 1849. http://dx.doi.org/10.3390/en13071849.

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In this paper a comparison of the wideband power sources of a pulse width modulation (PWM) inverter and a power supply composed of an audio power amplifier and a two-channel arbitrary generator is discussed. Their application is to supply a step-up current transformer for generation of the distorted current required to test the transformation accuracy of the distorted currents of the inductive current transformers. The proposed equations allow to calculate the maximum rms values of higher harmonic of distorted currents for its required main harmonic component. Moreover, they also enable the calculation of the maximum rms values of the main harmonic of the distorted current for which the required higher harmonic component may be obtained. This defines the usable bandwidth of the tested power source for their specific load. During work on high inductive impedance, the maximum voltage is the limitation that determines the higher harmonic value. While for resistive loads, the maximum current and the transistor’s slew rate are the limiting factors. The usage of the compensation system for the inductive reactance of the step-up current transformer under supply significantly increased its maximum output current. Its rms value with a 10% higher harmonic component up to 5 kHz was almost 400 A instead 100 A for the PWM-based power source and about 800 A instead 200 A for the power supply system with the audio amplifier.
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Dissertations / Theses on the topic "PWM-audio amplifier"

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Bjärhusen, Jonas, and Jan-Olof Martinsson. "PWM Effekt Audioförstärkare." Thesis, Linköping University, Department of Electrical Engineering, 2004. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-2637.

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The purpose with the report is to show that it is possible to design a class-D amplifier, using a programmable FPGA mounted on a developing card from Xess and a H-bridge. The FPGA was programmed in VHDL which is the language the software from Xilinx use to implement a logical function into the FPGA The logical function corresponds to a modeling of the music signal and the modeling can be described as a comparator which compare the music signal with a triangle wave and as a out signal produce a pulse width modulated (PWM) signal. The report is also a review and evaluating of two different modulating technologies, AD- modeling and BD-modeling. A detailed part about how the H-bridge was designed and how it works. The result of this project is a working audio amplifier to a significant lower price than the products in todays market.

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Melša, Vojtěch. "Výkonový audio zesilovač využívající AC/DC měnič." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2012. http://www.nusl.cz/ntk/nusl-219827.

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The aim of this work was to design and construct a simple audio amplifier, which would be based of involvement and components used in switching power sources on the maximum degree (for example from usual ATX sources for computer). The main motivation for development is the existence of many old sources that do not use and big interest of users for the construction of home audio amplifiers for small and medium power. Amplifiers based on switching power sources with greater efficiency and less weight than comparable classic amplifiers (working in classes A, B or AB). Their disadvantage is the complicated design and introduction of distortion and spurious signals to the amplified signal. This work will be described a design of simple amplifier, which will minimize these negative effects. For shortcomings and wrong parameters this proposed involvement will be eventually described and implemented design of amplifier in class D.
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Svadbík, Vít. "Návrh a konstrukce spínaného audio koncového zesilovače." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2010. http://www.nusl.cz/ntk/nusl-218603.

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This work describes the design of audio amplifiers operating in switching mode. The first part describes basic principles of the power stage switching concept. There is described differences between classes of amplifiers according to technology. The second larger part includes design and construction of the switching amplifiers. Design is implemented, including the preamplifier and power supply. Power supply works in switching mode. The measured parameters of the proposed facility are given in the last part.
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Svadbík, Pavel. "Digitální nízkofrekvenční zesilovač s univerzálními vstupy." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2012. http://www.nusl.cz/ntk/nusl-219816.

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This diploma thesis deals with digital audio amplifier with universal inputs and its design. The first part describes modulation and audio formats for audio electronics. The thesis contain design of a block diagram of the digital audio amplifier and describes the requirements for functional blocks. As a basic device for audio signal processing was choosen integrated circuit STA326. The thesis continue with circuits design for each blocks with a description of their principles. The next section describes the construction and firmware for microcontroller. The last part of this diploma thesis is targeted on the presentation of the measured parameters of the amplifier. The conclusion summarizes the results that have been achieved and advantages and disadvantages of the digital audio amplifier prototype.
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Konečný, Jiří. "Návrh stereo audio koncového zesilovače spínané třídy." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2013. http://www.nusl.cz/ntk/nusl-220270.

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This text analyzes characteristics of audio power amplifiers in class D. The emphasis is placed on more detailed analysis of modulators, drivers, connection topology of power transistors. In the next section of text are analyzed available integrated circuits of power amplifiers in class D which are manufactured by world producers. The last part describes design of all parts of amplifier in class D with discrete components and also of power supplies. According to the plans, the individual parts are made. All parts are tested by measurements and results are evaluated.
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Sun, Shao-Ming, and 孫紹茗. "Circuit Implementation of A PWM Class-D Audio Amplifier." Thesis, 2006. http://ndltd.ncl.edu.tw/handle/44144231676284639499.

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碩士
國立成功大學
電機工程學系碩博士班
94
The Class-D amplifier, for its high efficiency, has drawn much attentions recently. However, due to its switching operation, the linearity is needed to be improved by comparing with conventional linear amplifiers. Therefore, the negative feedback is applied in this thesis to reduce the harmonic distortion for better linearity. In addition, to avoid the shoot through current due to both power transistors are switched on at the same time, the dead time control is adopted. The over-current protection circuit is also added to prevent the short circuit by poor wire connection. The large current induced by the short circuit would destroy the overall system potentially. 　A single-ended input, differential output Class-D audio amplifier with pulse-width modulation (PWM) is implemented with TSMC 0.35um 2P4M 3.3V/5V Mixed Signal CMOS process. The active area of the amplifier is around 0.99 x 0.93 mm2, and the total area is 1.3 x 1.3 mm2. The simulation results show 90dB of SNR and 82% of efficiency can be achieved. THD is around 0.045% while Class-D amplifier deliver 240mW.
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Chang, Chih-Min, and 張智閔. "Low-Power Digital PWM Class-D Amplifier Techniques for Audio Applications." Thesis, 2017. http://ndltd.ncl.edu.tw/handle/zprf8j.

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博士
國立交通大學
電子研究所
105
This thesis presents digital PWM class-D amplifier (CDA) techniques for low-power applications. A digital PWM CDA converts an audio digital stream into sound directly and power-efficiently. It first encodes the pulse-code-modulated (PCM) audio input into a digital pulse-width-modulated (PWM) signal. Then, a digital-to-pulse converter (DPC) translates this digital PWM signal into a series of analog binary pulses accurately. Finally, a switching driver delivers this analog signal to a speaker. A new technique that digitally converts a PCM signal to a PWM signal is presented. This technique is based on the naturally-sampled PWM emulation scheme. Its computation is simplified by using empirical models. It provides sufficient accuracy with minimal computation. At 384 kHz sampling rate, the proposed technique can convert a sine wave to a PWM signal and achieve better than -92 dB total harmonic distortion (THD) for a sine wave frequency up to 20 kHz and a sine wave amplitude up to 90% of the full range. We also report a 5-3 segmented DPC with timing-skew calibration. The DPC includes both a counter and a delay line for pulse width conversion. The segmented architecture reduces the speed of the DPC counter and its counting clock. The timing skews along the delay line are detected using a zero-crossing detection scheme and corrected in the digital domain. This calibration can operate continuously in the background. A digital CDA was fabricated using a 65-nm CMOS technology. It includes the aforementioned PWM modulator and DPC. It also integrated an open-loop switching driver to deliver the DPC's output to a speaker. This digital CDA consumes 875 uW under a 1-V supply when the input is zero and no output power is transferred to the external load. It can deliver 13.3 mW to a 32 ohm resistive load in the H-bridge topology with 89% power efficiency. For a 1-kHz sine-wave input, it achieves 95 dBA dynamic range, 93.6 dBA peak SNR, 86.4 dBA peak SNDR, and 0.006% THD at -2-dBFS input level. The core area of the chip is 0.87x0.5 mm2.
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Huang, Wen-Chi, and 黃文麒. "Design of A High Efficiency Audio Power Amplifier with PWM Technique." Thesis, 2005. http://ndltd.ncl.edu.tw/handle/67177264296038107035.

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碩士
國立臺灣海洋大學
電機工程學系
93
Abstract Current electronic devices are becoming portable. The portability of electronic product requires small in size and high power efficiency for the long-term usage of batteries. The application products include hearing aids, USB speakers, notebook computers, wireless speakers, and automotive audio amplifiers. The high-power efficiency design can reduce power supply requirements and elimination of heat sinks. Because reducing power supply requirements and elimination of heat sinks, the size of product is becoming small. A single-chip High-efficiency 3.3V/0.7W class-D audio power amplifier is presented in this paper. Pulsed-width-modulated technique with bridge tied load is used in this class-D amplifier design. Compared with traditional low-efficiency class-AB amplifiers, this class-D amplifier has the efficiency of 91%. A load is used for amplifier design. The lowest total harmonic distortion is 0.64% when 250KHz triangle wave is used. The efficiency will increase when output power is increased. TSMC CMOS 0.35 2P4M process is used for this amplifier design.
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Yi-WenChen and 陳翊文. "A Low-Quiescent-Current High-Fidelity Class-D Audio Amplifier with PWM-Intermodulated-Distortion Reduction." Thesis, 2016. http://ndltd.ncl.edu.tw/handle/v9w9gz.

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Pan, Chun-Nan, and 潘俊男. "The Integration of High Efficiency Class-D Audio Power Amplifier with PWM DC/DC Buck Converter." Thesis, 2011. http://ndltd.ncl.edu.tw/handle/99875049041023566865.

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碩士
國立臺北大學
電機工程研究所
99
Consumers desire the new generation of devices will be developed in smaller physical size and lower cost than existing devices, and furthermore enhance the function and the battery life. The integration of high efficiency circuit make the product more popular with consumers of all ages. This paper presents the design of an integrated class D audio power amplifier with step-down (Buck) DC to DC converter. The high efficiency pulse-width modulation (PWM) buck converter is used to supply 1.5V for the class D power amplifier and other loads. The operating voltage range can be from 3V to 5V which is used for mobile devices. The class D power amplifier uses the three level pulse width modulation (PWM) to eliminate the external output low-pass filter. The circuit is designed with TSMC 0.35μm 2P4M 3.3V/5V mixed-signal CMOS process. The best total power efficiency of this integrated circuit achieves 85%, and the total harmonic distortion (THD) is less than 0.08% at 10 KHz with 8Ω load.
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Book chapters on the topic "PWM-audio amplifier"

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Das, Basudeb, Shibabrata Mukherjee, and Saswati Mazumdar. "Bidirectional Audio Transmission in Optical Wireless Communication Using PWM and Class D Amplifier." In Nanoelectronics, Circuits and Communication Systems, 131–45. Singapore: Springer Singapore, 2020. http://dx.doi.org/10.1007/978-981-15-7486-3_14.

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Conference papers on the topic "PWM-audio amplifier"

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Seo Weon Heo and Jongsun Kim. "Double edge trailing PWM based full digital audio amplifier design." In 2012 IEEE International Conference on Consumer Electronics (ICCE). IEEE, 2012. http://dx.doi.org/10.1109/icce.2012.6161852.

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Yoneya, Akihiko. "Spread Spectrum PWM Signal Generator for Fully Digital Audio Amplifier." In 2006 13th IEEE International Conference on Electronics, Circuits and Systems. IEEE, 2006. http://dx.doi.org/10.1109/icecs.2006.379770.

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Hegde, Shashank, A. N. Nagashree, and Vedagiri Babu. "A MSP430 controller based class-D audio power amplifier with DLDPC PWM switching." In 2017 International Conference on Smart Grids, Power and Advanced Control Engineering (ICSPACE). IEEE, 2017. http://dx.doi.org/10.1109/icspace.2017.8343431.

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Lindstrand, Jonas, Dejan Radjen, Robert Fitzgerald, Andreas Axholt, and Henrik Sjoland. "An Integrated 3-Level Fully Adjustable PWM Class-D Audio Amplifier in 0.35¿m CMOS." In 2008 NORCHIP. IEEE, 2008. http://dx.doi.org/10.1109/norchp.2008.4738304.

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Liou, Wan-Rone, Chun-Nan Pan, and Jia-Hsin Lin. "Integrated low-voltage filter-less class-D Audio power amplifier with PWM DC/DC buck converter." In 2010 International Conference on Communications, Circuits and Systems (ICCCAS). IEEE, 2010. http://dx.doi.org/10.1109/icccas.2010.5581940.

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Jasielski, Jacek, Stanislaw Kuta, Wojciech Kolodziejski, and Witold Machowski. "Hybrid LBDD PWM modulator for digital class-BD audio amplifier based on STM32F407VGT6 microcontroller and analog DLL." In 2015 MIXDES - 22nd International Conference "Mixed Design of Integrated Circuits & Systems". IEEE, 2015. http://dx.doi.org/10.1109/mixdes.2015.7208585.

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Lee, Ji-Hun, Jun-Suk Bang, Ki-Duk Kim, Hui-Dong Gwon, Sang-Hui Park, Yeunhee Huh, Kye-Seok Yoon, et al. "5.2 An 8Ω 10W 91%-power-efficiency 0.0023%-THD+N multi-level Class-D audio amplifier with folded PWM." In 2017 IEEE International Solid- State Circuits Conference - (ISSCC). IEEE, 2017. http://dx.doi.org/10.1109/isscc.2017.7870274.

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Chien, Shih-Hsiung, Yi-Wen Chen, and Tai-Haur Kuo. "A 0.96mA quiescent current, 0.0032% THD+N, 1.45W Class-D audio amplifier with area-efficient PWM-residual-aliasing reduction." In 2018 IEEE International Solid-State Circuits Conference (ISSCC). IEEE, 2018. http://dx.doi.org/10.1109/isscc.2018.8310183.

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Chien, Shih-Hsiung, Tai-Haur Kuo, Hung-Yi Huang, Hong-Bin Wang, and Yi-Zhi Qiu. "23.5 A 0.41mA Quiescent Current, 0.00091% THD+N Class-D Audio Amplifier with Frequency Equalization for PWM-Residual-Aliasing Reduction." In 2020 IEEE International Solid- State Circuits Conference - (ISSCC). IEEE, 2020. http://dx.doi.org/10.1109/isscc19947.2020.9062932.

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Wang, Wen-Chieh, and Yu-Hsin Lin. "5.2 A 118dB-PSRR 0.00067%(−103.5dB) THD+N and 3.1W fully differential class-D audio amplifier with PWM common-mode control." In 2016 IEEE International Solid-State Circuits Conference (ISSCC). IEEE, 2016. http://dx.doi.org/10.1109/isscc.2016.7417921.

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