公开(公告)号：US11714107B2

公开(公告)日：2023-08-01

申请号：US17666918

申请日：2022-02-08

Applicant: RENESAS ELECTRONICS CORPORATION

Inventor： Noriaki Matsuno ,  Shingo Sakamoto

IPC: G01R15/06

CPC classification number: G01R15/06

Abstract: A voltage divider circuit includes: a first voltage divider having first and second capacitors, and an output node configured to output a divider voltage from between the first and second capacitors; a second voltage divider having third and fourth capacitors, and first to third switches, and being connected in parallel to the first voltage divider; and a fourth switch provided between the output node and a connection node of the third and fourth capacitors. In the voltage divider circuit, the switches are controlled based on controlling periods.

公开(公告)号：US10270408B2

公开(公告)日：2019-04-23

申请号：US15730953

申请日：2017-10-12

Applicant: Renesas Electronics Corporation

Inventor： Shingo Sakamoto

IPC: H03F3/04 ,  H03G3/00 ,  H03F1/02 ,  H03F3/30 ,  H03F3/213 ,  H03G1/00 ,  H03G3/30 ,  G05F1/10 ,  H03F1/30 ,  H03F3/24 ,  H03F3/45

Abstract: Use of a closed loop APC may involve a problem of cost and power consumption due to increased circuit scale.The semiconductor device includes a power amplifier that amplifies an output from a transmission circuit and a regulator that supplies power to the power amplifier. The regulator includes an operational amplifier comprising a loop gain control circuit and a loop gain control voltage generation circuit that supplies control voltage to the loop gain control circuit. The loop gain control voltage generation circuit minimizes a loop gain of the operational amplifier when starting up the regulator.