公开(公告)号：US20220407471A1

公开(公告)日：2022-12-22

申请号：US17353214

申请日：2021-06-21

Applicant: TEXAS INSTRUMENTS INCORPORATED

Inventor： SIRAJ AKHTAR ,  SWAMINATHAN SANKARAN

IPC: H03F1/32

Abstract: A circuit includes a main amplifier having a first input and a first output. A main bias circuit is coupled to the main amplifier, and the main bias circuit configured to operate the main amplifier in a first frequency band. A feedforward cancellation amplifier has a second input and a second output, in which the second input is coupled to the first input, and the second output is coupled to the first output. A filter is coupled between the first input and the second input. A feedforward bias circuit is coupled to the feedforward cancellation amplifier. The feedforward bias circuit is configured to operate the feedforward cancellation amplifier in a second frequency band within and narrower than the first frequency band.