An integrated 200-w class-d audio amplifier

Berkhout, Marco

doi:10.1109/jssc.2003.813238

Cited by 144 publications

(104 citation statements)

References 2 publications

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“…After the input signal is modulated and amplified, it would be still in digital form and speaker's input must be an analog signal [17]. Before choosing a suitable filter, it is important to evaluate system's output.…”

Section: Filter Stagementioning

confidence: 99%

See 1 more Smart Citation

Design of Novel Low-Power and High-Efficiency Class-d Audio Amplifier

Hajhashemkhani¹,

Karimi²,

Rezai³

2017

IJCA

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Section: Filter Stagementioning

confidence: 99%

“…However, unwanted harmonic in this method is lower than the PWM method [6]. Several methods and structures have been proposed to increase the efficiency of class-D amplifiers based on its stages [7][8][9][10][11][12][13][14][15][16][17][18][19][20][21].…”

Section: Introductionmentioning

confidence: 99%

Design of Novel Low-Power and High-Efficiency Class-d Audio Amplifier

Hajhashemkhani¹,

Karimi²,

Rezai³

2017

IJCA

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show abstract

“…The architectures of the class-D amplifier can be classified into two types: 1) one based on pulse width modulation (PWM) method [5,6] and 2) another based on pulse density modulation (PDM) method using a delta-sigma modulator (DSM) [7]. For an audio amplifier based on PWM method, a comparator is used to generate a pulse signal by comparing the input signal and a carrier signal which has a triangular or saw-tooth waveform.…”

Section: Introductionmentioning

confidence: 99%

Low-Power and High-Efficiency Class-D Audio Amplifier Using Composite Interpolation Filter for Digital Modulators

Kang¹,

Kim²,

Gu³

et al. 2014

JSTS:Journal of Semiconductor Technology and Science

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Abstract-This paper presents a high-efficiency digital class-D audio amplifier using a composite interpolation filter for portable audio devices. The proposed audio amplifier is composed of an interpolation filter, a delta-sigma modulator, and a class-D output stage. To reduce power consumption, the designed interpolation filter has an optimized composite structure that uses a direct-form symmetric and Lagrange FIR filters. Compared to the filters with homogeneous structures, the hardware cost and complexity are reduced by about half by the optimization. The coefficients of the digital deltasigma modulator are also optimized for low power consumption. The class-D output stage has gate driver circuits to reduce shoot-through current. The implemented class-D audio amplifier exhibited a high efficiency of 87.8 % with an output power of 57 mW at a load impedance of 16 Ω and a power supply voltage of 1.8 V. An outstanding signal-to-noise ratio of 90 dB and a total harmonic distortion plus noise of 0.03 % are achieved for a single-tone input signal with a frequency of 1 kHz.

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“…The class-D amplifier therefore achieve very high power efficiency since the power transistors are operated in linear and cut-off region and the power loss occurs only at the moment that power transistor changes its status [6]. Moreover, with fixed power delivery, the class-D amplifier requires smaller power transistors and heat sink so that significantly reduces the system volume [7][8]. The major inferiority of class-D amplifier is the need of LC filter used to remove the high order harmonic and recover audio signal [11].…”

Section: Introductionmentioning

confidence: 99%