公开(公告)号：US20210091981A1

公开(公告)日：2021-03-25

申请号：US17114284

申请日：2020-12-07

Applicant: SOCIONEXT INC.

Inventor： Taku HIRAMATSU ,  Shigeaki Kawai

IPC: H04L25/49 ,  H03K17/687 ,  H04B1/04 ,  H03K19/0175

Abstract: A signal output circuit includes: a driver circuit including a variable current source and configured to output a multilevel signal; a replica circuit having a circuit configuration equivalent to the driver circuit; and a control circuit configured to control a characteristic of the driver circuit, based on an output signal of the replica circuit, wherein the replica circuit includes: a first replica circuit part configured to output first output signals having signal levels of a first subset of a plurality of signal levels corresponding to the multilevel signal; and a second replica circuit part configured to output second output signals having signal levels of a second subset of the plurality of signal levels, and the control circuit is configured to control a characteristic of the variable current source, based the first output signals and the second output signals.

公开(公告)号：US20190245721A1

公开(公告)日：2019-08-08

申请号：US16255388

申请日：2019-01-23

Applicant: SOCIONEXT INC.

Inventor： Taku HIRAMATSU ,  Shigeaki Kawai

IPC: H04L25/49 ,  H04B1/04 ,  H03K17/687

CPC classification number: H04L25/4917 ,  H03K17/687 ,  H04B1/04

Abstract: A signal output circuit includes: a driver circuit including a variable current source and configured to output a multilevel signal; a replica circuit having a circuit configuration equivalent to the driver circuit; and a control circuit configured to control a characteristic of the driver circuit, based on an output signal of the replica circuit, wherein the replica circuit includes: a first replica circuit part configured to output first output signals having signal levels of a first subset of a plurality of signal levels corresponding to the multilevel signal; and a second replica circuit part configured to output second output signals having signal levels of a second subset of the plurality of signal levels, and the control circuit is configured to control a characteristic of the variable current source, based the first output signals and the second output signals.