用于三电平δ - σ调制器的多通道抽取器

Proceedings of ICASSP '94. IEEE International Conference on Acoustics, Speech and Signal Processing Pub Date : 1994-04-19 DOI:10.1109/ICASSP.1994.389605

S. Bernadas, C. Thompson

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引用次数: 4

摘要

描述了一种8通道抽取滤波器，可级联到1024通道，用于三电平delta-sigma调制器(DSM)。该滤波器采用最小均方(LMS)自适应校正算法对三电平DSM输入数据进行数字校正。此外，数字失调和增益校准功能以及输出限制电路减少了对DSM模拟输入的要求。抽取比为128比1，输出数据为22位，集成地板为-116 dB。滤波器系数的设计过程是独特的，需要脉冲响应和频率响应的优化。LMS校正可使信噪比提高40 dB。

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A multi-channel decimator for a tri-level delta-sigma modulator

An 8-channel decimation filter, cascadable to 1024 channels, for use with a tri-level delta-sigma modulator (DSM) is described. The filter incorporates a least mean squares (LMS) adaptive correction algorithm to digitally correct the tri-level DSM input data. Additionally, digital offset and gain calibration features and output limiting circuitry reduce the requirements on the analog input to the DSM. The decimation ratio is 128 to 1 and the output data is 22 bits with an integrated floor of -116 dB. The filter coefficient design procedure was unique requiring both impulse response and frequency response optimization. LMS correction can improve the Signal-Noise Ratio by 40 dB.<>

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Proceedings of ICASSP '94. IEEE International Conference on Acoustics, Speech and Signal Processing

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