公开(公告)号：US20230344394A1

公开(公告)日：2023-10-26

申请号：US18303750

申请日：2023-04-20

Applicant: Cirrus Logic International Semiconductor Ltd.

Inventor： John L. MELANSON ,  Abhishek MUKHERJEE ,  Lingli ZHANG ,  Zhaohui HE

IPC: H03F3/217 ,  H03F1/32 ,  H03F1/02

CPC classification number: H03F3/2175 ,  H03F1/3264 ,  H03F1/0255 ,  H03F2200/351 ,  H03F2200/03

Abstract: A system may include an analog loop filter comprising a plurality of analog integrators, the analog loop filter configured to receive an analog signal input and a feedback output signal, at least one sampler for sampling outputs of the analog integrators, a second loop filter coupled between an output of an analog pulse-width modulation driver and a digital pulse-width modulation controller, wherein the second loop filter comprises at least one integrator and is configured to receive sampled outputs of the analog integrators from the at least one sampler and receive a feedback pulse-width modulation signal from the analog pulse-width modulation driver, and a correction subsystem configured to apply a non-linear function to a signal path of the second loop filter in order to compensate for non-linearity introduced as a result of sampling outputs of the analog integrators.