公开(公告)号：US20220091164A1

公开(公告)日：2022-03-24

申请号：US17492210

申请日：2021-10-01

Applicant: STMicroelectronics Asia Pacific Pte Ltd

Inventor： Yannick GUEDON ,  Baris Volkan YILDIRIM ,  Teerasak LEE

IPC: G01R19/25 ,  H02J50/12

Abstract: A circuit includes a tank capacitor coupled between first and second nodes, and a sense resistor having a first terminal coupled to the first node and a second terminal coupled to a regulator input. A switching circuit has first and second inputs coupled to the first and second terminals of the sense resistor. A gain stage has first and second inputs capacitively coupled to first and second outputs of the switching circuit. An analog-to-digital converter receives the output of the gain stage, and receives first and second differential voltages. A reference voltage generator has a temperature independent current source coupled to source current to a reference resistor, the first differential reference voltage being formed across the reference resistor. The reference resistor and sense resistor are located sufficiently close to one another on a single common substrate such that they remain at substantially a same temperature.