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首页> 外文期刊>IEEE Journal of Solid-State Circuits >Area-efficient multichannel oversampled PCM voice-band coder
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Area-efficient multichannel oversampled PCM voice-band coder

机译:面积有效的多通道过采样PCM语音频带编码器

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摘要

The authors describe the design of a four-channel oversampled A/D (analog/digital) converter with transmit filter for voice-band application. The decimator filter is timeshared between the four channels and the architecture of the sigma-delta coder is selected on the basis of minimizing the chip area. The analog front-end loop is fully differential to minimize the channel-to-channel crosstalk. The key issues in designing a multichannel oversampled A/D converter for area efficiency are addressed. It is concluded that for the multichannel telephony voice-band application implemented in CMOS technology, a first-order loop is most area-efficient. The performance of the coder has been evaluated and it is shown to have a dynamic range of 79 dB, to occupy a total active area of 33000 mils/sup 2/ or 8250 mils/sup 2/ per channel, and to meet the D3 specifications for the transmit filter. It runs on a 5-V supply and consumes 50 mW per channel.
机译:作者介绍了一种四通道过采样A / D(模拟/数字)转换器的设计,该转换器具有用于语音频带应用的发射滤波器。抽取滤波器在四个通道之间分时共享,并且在最小化芯片面积的基础上选择sigma-delta编码器的架构。模拟前端环路是完全差分的,以最小化通道间的串扰。解决了设计多通道过采样A / D转换器以提高效率的关键问题。可以得出结论,对于以CMOS技术实现的多通道电话语音频带应用,一阶环路的面积效率最高。已经评估了编码器的性能,它的动态范围为79 dB,每个通道占用的总有效面积为33000 mils / sup 2 /或8250 mils / sup 2 /,并且符合D3规范用于发射滤波器。它采用5V电源供电,每通道功耗50mW。

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