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Relevant bibliographies by topics / Class-D audio amplifier

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Journal articles

Academic literature on the topic 'Class-D audio amplifier'

Author: Grafiati

Published: 4 June 2021

Last updated: 12 June 2025

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Journal articles on the topic "Class-D audio amplifier"

1

Kharis, Muhamad, Dhidik Prastiyanto, and Suryono Suryono. "Perbandingan Efisiensi Daya Penguat Audio Kelas AB dengan Penguat Audio Kelas D untuk Keperluan Sound System Lapangan." Jurnal Teknik Elektro 10, no. 2 (2018): 54–58. http://dx.doi.org/10.15294/jte.v10i2.11183.

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Class AB audio amplifiers are commonly used but the efficiency is 50%. While the efficiency of class D audio amplifiers is 90% but are rarely used. The purpose of this research is to know how much the power efficiency of field sound system between 1000 watts class AB amplifier and 900 watts class D amplifier. This study is a comparative study that compares different variables with the same sample. The results of power efficiency are obtained from the percentage comparison between the output power and the input power of each audio amplifier. The power efficiency of class D audio amplifiers with IRS D900 type larger than class AB audio amplifiers with Apex B500 type. The efficiency value of class D audio amplifiers at the highest output power reaches 87% while class AB audio amplifiers are only 73%.

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2

Teplechuk, Mykhaylo A., Anthony Gribben, and Christophe Amadi. "True Filterless Class-D Audio Amplifier." IEEE Journal of Solid-State Circuits 46, no. 12 (2011): 2784–93. http://dx.doi.org/10.1109/jssc.2011.2162913.

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3

Cox, Stephen M., Meng Tong Tan, and Jun Yu. "A Second-Order Class-D Audio Amplifier." SIAM Journal on Applied Mathematics 71, no. 1 (2011): 270–87. http://dx.doi.org/10.1137/100788367.

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4

Murtianta, Budihardja. "PENGUAT KELAS D DENGAN METODE SUMMING INTEGRATOR." Elektrika 11, no. 2 (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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5

Hanzlik, Tomasz. "Class D audio amplifier and method for compensation of power supply voltage influence on output audio signal in class D audio amplifier." Journal of the Acoustical Society of America 120, no. 5 (2006): 2400. http://dx.doi.org/10.1121/1.2395103.

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6

Zhang, Yan Lei, Gao Feng Zhu, and Tie Bin Wu. "Control Techniques of Class D Audio Power Amplifier." Applied Mechanics and Materials 631-632 (September 2014): 422–26. http://dx.doi.org/10.4028/www.scientific.net/amm.631-632.422.

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Although class D amplifier has the merits of high efficiency, a little heat and small Bulk, its distortion is larger than linear counterparts due to switching behaviour of power transistors. Its principle and several new pivotal control technologies were presented in this paper. In this way, efficiency of 90% can be achieved and the degree of the distortion can be less than 0.4%.

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7

Berkhout, M. "An integrated 200-w class-d audio amplifier." IEEE Journal of Solid-State Circuits 38, no. 7 (2003): 1198–206. http://dx.doi.org/10.1109/jssc.2003.813238.

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8

Zhang, Si Min. "IC Design of the Band-Gap Reference and the Triangular Waveform Generator of Class D Audio Amplifier." Applied Mechanics and Materials 511-512 (February 2014): 757–63. http://dx.doi.org/10.4028/www.scientific.net/amm.511-512.757.

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Class D audio amplifier can extend battery life for its small cubage and high efficiency. In connection with the advantages of Class D audio amplifier, a class D audio amplifier with high efficiency and low distortion is designed in this paper. A negative feedback is established to improve the linearity of the amplifier and power supply ripple rejection ratio. Minimizing the distortion of the system requires high-speed sampling. High-speed comparator is designed to meet this requirement. Moreover, the work requires that the chip has a band-gap reference with low temperature coefficient and high power supply rejection ratio.

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9

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 (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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10

Pillonnet, Gael, Remy Cellier, Angelo Nagari, Philippe Lombard, and Nacer Abouchi. "Sliding mode audio class-D amplifier for portable devices." Analog Integrated Circuits and Signal Processing 74, no. 2 (2012): 439–51. http://dx.doi.org/10.1007/s10470-012-9989-2.

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