公开(公告)号：US11824549B2

公开(公告)日：2023-11-21

申请号：US17494494

申请日：2021-10-05

Applicant: SHENZHEN GOODIX TECHNOLOGY CO., LTD.

Inventor： Junxi Chen ,  Zhengfeng Wang

IPC: H03M1/08 ,  H03F3/45 ,  H03M1/80 ,  H03M1/46 ,  G05F1/575 ,  G05F1/595 ,  H03F3/50 ,  H03M1/38

CPC classification number: H03M1/0863 ,  G05F1/575 ,  G05F1/595 ,  H03F3/45475 ,  H03F3/505 ,  H03M1/46 ,  H03M1/804 ,  H03M1/38

Abstract: A reference voltage buffer circuit is provided, which could improve the reliability of the reference voltage buffer circuit, including: at least one output branch, where each output branch includes a delay control branch, a first MOSFET, and a second MOSFET; and a feedback branch, where in a first time period, the feedback branch is configured to output a first voltage to the delay control branch, and the delay control branch is configured to control the first MOSFET and the second MOSFET to be turned on, such that a source of the first MOSFET continuously outputs a reference voltage; and in a second time period, a voltage output from the feedback branch to the delay control branch is 0, the delay control branch is configured to control the second MOSFET to be turned off before the first MOSFET is turned off.