用于宽带语音编码的单片/spl Sigma//spl Delta/ A/D和带滤波器的D/A转换器

1991 IEEE International Solid-State Circuits Conference. Digest of Technical Papers Pub Date : 1991-02-13 DOI:10.1109/ISSCC.1991.689142

R. Lerch, M. Lamkemeyer, H. Fiedler, W. Bradinal, P. Becker

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引用次数: 6

摘要

作者提出了一个5- v - 14b, 16ksamples /s线性编解码器，适合作为CCITT G722编解码器的音频部分。该器件采用二阶σ - δ调制进行模拟/数字(A/D)和数字/模拟(D/A)转换，速度为2.048 Msamples/s。在A/D端使用具有集成抗混叠滤波的时间连续调制器，避免了外部抗混叠滤波器的需要。用于抽取和插值的数字滤波器由定制的数字信号处理器(DSP)和专用硬件实现。该器件采用3 μ m SACMOS技术，在31 mm/sup /芯片上使用74000个晶体管实现。采用级联A/D和D/A路径，可获得80db以上的动态范围和0.3 dB的通带纹波。>

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A Monolithic /spl Sigma//spl Delta/ A/D And D/A Converter With Filter For Broadband Speech Coding

The authors present a 5-V-only 14-b, 16 ksamples/s linear codec suitable as the audio part of a CCITT G722 codec. The device uses second-order sigma-delta modulation for both analog/digital (A/D) and digital/analog (D/A) conversion at 2.048 Msamples/s. A time-continuous modulator with integrated antialias filtering is used at the A/D side, obviating the need for an external antialiasing filter. The digital filters for decimation and interpolation are implemented with both a custom digital signal processor (DSP) and specialized hardware. The device was realized with 74000 transistors on a 31-mm/sup 2/ die in a 3- mu m SACMOS technology. A dynamic range of more than 80 dB and a passband ripple of 0.3 dB were attained with A/D and D/A paths in cascade. >

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来源期刊

1991 IEEE International Solid-State Circuits Conference. Digest of Technical Papers

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