A 1 W 104 dB SNR Filter-Less Fully-Digital Open-Loop Class D Audio Amplifier With EMI Reduction

Guanziroli F.; Bassoli R.; Crippa C.Devecchi D.Nicollini G.

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A 1 W 104 dB SNR Filter-Less Fully-Digital Open-Loop Class D Audio Amplifier With EMI Reduction

机译：A 1 W 104 dB SNR Filter-Less Fully-Digital Open-Loop Class D Audio Amplifier With EMI Reduction

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摘要

This paper presents the design and implementation of a high-performance fully-digital PWM DAC and switching output stage which can drive a speaker in portable devices, including cellular phones. Thanks to the quaternary pulse-width modulation scheme, filter-less implementation are possible. A pre-modulation DSP algorithm eliminates the harmonic distortion inherent to the employed modulation process, and an oversampling noise shaper reduces the modulator clock speed to facilitate the hardware implementation while keeping high-fidelity quality. Radiated electromagnetic field emission of the class D amplifier is reduced thanks to a clock spreading technique with only a minor impact on audio performance characteristics. Clock jitter effects on the audio amplifier performance are presented, showing very low degradation for jitter value up to a few nanoseconds. The digital section works with a 1.2 V power supply voltage, while the output switching stage and its driver are supplied from a high-efficiency DC-DC converter either at 3.6 V or 5 V. An output power of 0.5 W at 3.6 V and 1 W at 5 V over an 8 $Omega$ load with efficiency (digital section included) of about 79 and 81, respectively, has been achieved. The total harmonic distortion (THD) at maximum output level is about 0.2, while the dynamic range is 104 dB A-weighted. The active area is about 0.94 mm$^{2}$ in a 0.13 $mu$m single-poly, five-metal, N-well digital CMOS technology with double-oxide option (0.5 $mu$m minimum length).

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来源
《IEEE Journal of Solid-State Circuits》 |2012年第3期|686-698|共13页
作者
Guanziroli F.; Bassoli R.; Crippa C.Devecchi D.Nicollini G.;
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作者单位

ST-Ericsson, Agrate Brianza, Italy;

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收录信息美国《科学引文索引》(SCI);美国《工程索引》(EI);
原文格式 PDF
正文语种英语
中图分类基本电子电路;
关键词
Audio amplifiers; EMI; class D amplifiers; harmonic distortion; jitter; noise-shapers; power amplifiers; power-supply intermodulation distortion (PS-IMD); power-supply rejection (PSR); pulse-width modulation (PWM); switching amplifiers;

A 1 W 104 dB SNR Filter-Less Fully-Digital Open-Loop Class D Audio Amplifier With EMI Reduction

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