Quantizer for sigma-delta modulator, sigma-delta modulator, and noise-shaped method

US11611353B2 · kind B2 · utility

Assignee

• INSTITUTE OF MICROELECTRONICS OF THE CHINESE ACADEMY OF SCIENCES · CN

Inventors

• Kunyu Wang · Beijing, CN
• Li ZHOU · Nantong, CN
• Jie Chen · New Taipei, TW
• Minghui Chen · Los Angeles, US
• Ming-Syuan Chen · Changsha, CN
• Wenjing Xu · San Jose, US
• Chengbin Zhang · Beijing, CN

Key dates

• Filing date: Jun 4, 2021
• Grant date: Mar 21, 2023
• Expiry date: Oct 28, 2041

Classification

• Technology area (CPC H): Electricity
• CPC primary: H03M3/458
• WIPO field: Basic communication processes
• WIPO sector: Electrical engineering

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.