Chinese Academy of Sciences

Wenjing Xu

Ming Jin Chen

Jie Chen

Li Zhou

Minghui Chen

Kunyu Wang

Chengbin Zhang

A quantizer for a sigma-delta modulator, a sigma-delta modulator, and a method of shaping noise are provided. The quantizer includes: an integrator configured to generate, in a Ksampling period, a quantization error signal for a Kperiod according to an internal signal, a quantization error signal for a (K&#x2212;1)period, a filtered quantization error signal for the (K&#x2212;1)period and a filtered quantization error signal for a (K&#x2212;2)period; an integrating capacitor configured to store the quantization error signal for the Kperiod, to weight the internal signal in a (K+1)sampling period; a passive low-pass filter configured to acquire the quantization error signal for the Kperiod in a Kdischarge period, and feed back the filtered quantization error signal to the integrator in a (K+1)sampling period and a (K+2)sampling period; and a comparator configured to quantize the quantization error signal for the Kperiod.

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Beijing, China

Wenjing Xu