公开(公告)号：US20220311393A1

公开(公告)日：2022-09-29

申请号：US17213084

申请日：2021-03-25

Applicant: SYNAPTICS INCORPORATED

Inventor： Dan SHEN ,  Jinbao LAN ,  Yunfu ZHANG ,  Lorenzo CRESPI

IPC: H03F3/217

Abstract: Various techniques are provided to reduce common mode disturbance associated with an amplifier, such as a class D amplifier. In one example, an amplifier includes a power stage configured to generate first and second PWM signals. The amplifier further includes an integration stage comprising input nodes configured to receive an input differential analog signal. The integration stage is configured to generate an output differential analog signal in response to the PWM signals and the input differential analog signal. The amplifier further includes an active compensation circuit configured to provide a compensation signal to the integration stage to reduce disturbances at the input nodes associated with the PWM signals switching between a common mode and a differential mode. Additional devices, systems, and methods are also provided.