公开(公告)号：US10243531B1

公开(公告)日：2019-03-26

申请号：US15701072

申请日：2017-09-11

Applicant: QUALCOMM Incorporated

Inventor： Pradeep Thiagarajan ,  Xiaobin Yuan ,  Todd Morgan Rasmus

IPC: H03F3/45 ,  H03G3/30

Abstract: A differential signal processing circuit includes a local common mode voltage control circuit for controlling a common mode voltage of an output differential signal generated by the differential signal processing circuit based on an external common mode control current generated by an external common mode voltage control circuit. The differential signal processing circuit, which may be configured as a variable gain amplifier (VGA) or a continuous time linear equalizer (CTLE), includes a pair of load devices, a pair of input transistors, and a pair of current source transistors coupled via separate paths between upper and lower voltage rails. The external control circuit includes a replica circuit including a replica load device, a replica input transistor, and a replica current source transistor. The external control circuit sets the replica common mode voltage to a target using a current, wherein the external common mode control current is based on that current.

公开(公告)号：US20190081604A1

公开(公告)日：2019-03-14

申请号：US15701072

申请日：2017-09-11

Applicant: QUALCOMM Incorporated

Inventor： Pradeep Thiagarajan ,  Xiaobin Yuan ,  Todd Morgan Rasmus

IPC: H03G3/30 ,  H03F3/45

Abstract: A differential signal processing circuit includes a local common mode voltage control circuit for controlling a common mode voltage of an output differential signal generated by the differential signal processing circuit based on an external common mode control current generated by an external common mode voltage control circuit. The differential signal processing circuit, which may be configured as a variable gain amplifier (VGA) or a continuous time linear equalizer (CTLE), includes a pair of load devices, a pair of input transistors, and a pair of current source transistors coupled via separate paths between upper and lower voltage rails. The external control circuit includes a replica circuit including a replica load device, a replica input transistor, and a replica current source transistor. The external control circuit sets the replica common mode voltage to a target using a current, wherein the external common mode control current is based on that current.