公开(公告)号：US11067608B2

公开(公告)日：2021-07-20

申请号：US16441027

申请日：2019-06-14

Applicant: Novatek Microelectronics Corp.

Inventor： Chih-Wen Lu ,  Chih-Hao Lin ,  Jhih-Siou Cheng ,  Chieh-An Lin

IPC: G01R17/00 ,  G01R19/00 ,  H03F3/45

Abstract: A current sensor including a voltage generation circuit and a voltage integration circuit is provided. The voltage generation circuit is configured to generate a first voltage according to a current to be sensed. The voltage integration circuit is coupled to the voltage generation circuit and configured to receive the first voltage and a second voltage to generate an output voltage. The voltage integration circuit includes a first amplifier, a second amplifier and a first capacitor. The first amplifier is configured to receive the first voltage and the second voltage to generate a third voltage. The second amplifier is coupled to the first amplifier and configured to receive the third voltage to generate the output voltage. The first capacitor is coupled between an output terminal of the voltage generation circuit and an output terminal of the first amplifier and configured to reduce a voltage difference between the first voltage and the second voltage.