Class D Audio Amplifier with Reduced Distortion

Kovacevic, Svjetlana; Pesic-Brdjanin, Tatjana; Galic, Jovan

doi:10.1109/indel.2018.8637607

Cited by 5 publications

(6 citation statements)

References 5 publications

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“…The proposed architecture reduces overlapping of MOSFETs inputs, guarantees power, and voltage-level adaptation and decreasing switching time by conveniently discharging different MOSFETs capacitors. The picked MOSFET transistors have very small "on" output resistance and small gate capacitance which guarantee low dissipation in portable applications [19].…”

Section: Proposed Circuitmentioning

confidence: 99%

A simple architecture for high performance class-D audio amplifier with novel RC network as negative feedback loop

Bellili

Bekhouche

2022

IJEECS

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<span>In this work, we have designed and simulated a proposed architecture and good performances single-ended class-D audio amplifier (CDA). The proposed circuit is build using pulse-width modulation (PWM). We have proposed a novel RC network as negative feedback loop attached to a second-order integrator to get free of high-frequency carrier ripples and to reach improved output accuracy, thus improved performance and efficiency. This proposed negative feedback loop extremely reduces total harmonic distortion plus noise (THD+N). We have used a passive second-order butterworth output filter. This circuit fulfills a power supply rejection ratio (PSRR) of 75 dB, a THD+N of 0.004%, 3 times less than attained by usual feedback loop. The proposed circuit with quiescent current of 0.02 mA, signal to noise ratio (SNR) of 89 dB, and peak efficiency of 90% is running at 400 kHz switching frequency. The results of simulation demonstrate that this circuit significantly keeps up with the performance of other circuits but taking advantage of its simple architecture.</span>

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Section: Proposed Circuitmentioning

confidence: 99%

A simple architecture for high performance class-D audio amplifier with novel RC network as negative feedback loop

Bellili

Bekhouche

2022

IJEECS

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“…A low-voltage class-D amplifier design is presented in [7]. The objective of the research is to propose a class-D amplifier for audio applications with minimum distortion.…”

Section: State-of-the-artmentioning

confidence: 99%

An Energy-Efficient Integration of a Digital Modulator and a Class-D Amplifier

et al. 2020

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Energy consumption is always a key feature in devices powered by electric accumulators. The power amplifier is the most energy-demanding module in mobile devices, portable appliances, static transceivers, and even nodes used in underwater acoustic networks. These devices incorporate a modulator, typically a pulse-width modulation (PWM) and a class-D power amplifier, for higher efficiency. We propose a technique to integrate the modulator of a transmitter and PW-modulator of a class-D amplifier to improve the overall efficiency of the system. This integrated set operates as an up-converter, phase modulator (PM), and binary phase-shift keying (BPSK) modulator under certain conditions. The theoretical concept is verified using Matlab and a model is designed and simulated in Simulink. For validation purposes, an electronic circuit is built and tested using Multisim. The results obtained by simulations and circuit implementation show that the proposed integrated system is an energy-efficient and cost-effective solution compared to conventional techniques.

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“…[2] Portable devices intensive development of design requires low-power and small complexity. [3] Because they are battery supplied, energy efficiency with low distortion are substantial requirements. Due to all of these features, class-D amplifier is an excellent solution compared to the all other classes.…”

Section: Introductionmentioning

confidence: 99%

Class-D Audio Amplifier using Sigma-Delta (ΣΔ) Modulator

Bellili

Bekhouche

2022

IJEEI

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Pulse width modulation and pulse density modulation are deemed to be main modulation techniques, even PDM could not emulate PWM, in terms of, basically, simplicity. PDM bitstream is encoded through sigma-delta modulation. Since sigma-delta modulation, compared to PWM, needs very high switching frequency and more complicated materials to compose circuits, it's more difficult to design one. In this article we design a low-power class-D audio amplifier circuit where the analog signal is encoded into pulse density modulation (PDM) using a first-order sigma-delta (ΣΔ) modulator. The designed circuit is built using Orcad-PSpice and results are analyzed with Matlab. A second-order integrator, a voltage divider as a feedback loop are used to mitigate basically, THD and get high efficiency. The audio signal is passed to the EM speaker through a Butterworth low-pass filter. A low THD of less than 0.2 % is obtained comparing to similar circuits in the literature and a high efficiency of 92 % is achieved.

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Class D Audio Amplifier with Reduced Distortion

Cited by 5 publications

References 5 publications

A simple architecture for high performance class-D audio amplifier with novel RC network as negative feedback loop

A simple architecture for high performance class-D audio amplifier with novel RC network as negative feedback loop

An Energy-Efficient Integration of a Digital Modulator and a Class-D Amplifier

Class-D Audio Amplifier using Sigma-Delta (ΣΔ) Modulator

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