公开(公告)号：US08736474B1

公开(公告)日：2014-05-27

申请号：US13846627

申请日：2013-03-18

Applicant: Richtek Technology Corp.

Inventor： Chih-Hsien Wang

IPC: H03M3/00

CPC classification number: H03M3/454 ,  H03M3/458

Abstract: A delta-sigma modulator includes: a loop filter for processing an analog input signal and a feedback signal to generate a filtered signal; a noise coupler operable to generate a noise coupled signal based on the filtered signal and the feedback signal; a quantizer for quantizing the noise coupled signal to generate a digital output signal; and a digital-to-analog converter converting the digital output signal to the feedback signal. The noise coupler includes an amplifier that has an inverting input terminal receiving a difference between the filtered signal and the feedback signal, and a non-inverting output terminal outputting the noise coupled signal, and a capacitor coupled between the inverting input terminal and the non-inverting output terminal of the amplifier.

Abstract translation: Δ-Σ调制器包括：环路滤波器，用于处理模拟输入信号和反馈信号以产生滤波信号; 噪声耦合器，其可操作以基于滤波信号和反馈信号产生噪声耦合信号; 量化器，用于量化噪声耦合信号以产生数字输出信号; 以及将数字输出信号转换为反馈信号的数模转换器。 噪声耦合器包括具有接收滤波信号和反馈信号之间的差的反相输入端的放大器和输出噪声耦合信号的非反相输出端，以及耦合在反相输入端和非反相输入端之间的电容器， 放大器的反相输出端子。