公开(公告)号：US20220416808A1

公开(公告)日：2022-12-29

申请号：US17422050

申请日：2021-06-04

Applicant: INSTITUTE OF MICROELECTRONICS, CHINESE ACADEMY OF SCIENCES

Inventor： Kunyu WANG ,  Li ZHOU ,  Jie CHEN ,  Minghui CHEN ,  Ming CHEN ,  Wenjing XU ,  Chengbin ZHANG

IPC: H03M3/00

Abstract: 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 Kth sampling period, a quantization error signal for a Kth period according to an internal signal, a quantization error signal for a (K−1)th period, a filtered quantization error signal for the (K−1)th period and a filtered quantization error signal for a (K−2)th period; an integrating capacitor configured to store the quantization error signal for the Kth period, to weight the internal signal in a (K+1)th sampling period; a passive low-pass filter configured to acquire the quantization error signal for the Kth period in a Kth discharge period, and feed back the filtered quantization error signal to the integrator in a (K+1)th sampling period and a (K+2)th sampling period; and a comparator configured to quantize the quantization error signal for the Kth period.