公开(公告)号：US20190293691A1

公开(公告)日：2019-09-26

申请号：US16354781

申请日：2019-03-15

Applicant: Cirrus Logic International Semiconductor Ltd.

Inventor： Katy HOLLAND ,  Vamsikrishna PARUPALLI ,  Christian LARSEN ,  Graeme MACKAY

IPC: G01R19/10 ,  H03F1/02 ,  H03F3/45

Abstract: A method for calculating a calibration gain used for common-mode rejection in a current sensing system may include measuring a first value of a common-mode voltage associated with the current sensing system and a first output value of the current sensing system occurring at the first value of the common-mode voltage, measuring a second value of the common-mode voltage associated with the current sensing system and a second output value of the current sensing system occurring at the second value of the common-mode voltage, and based on a difference between the second output value of the current sensing system and the first output value of the current sensing system and a difference between the second value of the common-mode voltage and the first value of the common-mode voltage, calculating the calibration gain.