公开(公告)号：US10601383B2

公开(公告)日：2020-03-24

申请号：US16104954

申请日：2018-08-20

Applicant: PixArt Imaging Inc.

Inventor： Balasubramaniam Shammugasamy ,  Kei Tee Tiew

IPC: H03F1/02 ,  H03F3/08 ,  H03F3/45 ,  H03F3/21

Abstract: An amplifier circuit comprising: a first amplifier, comprising a voltage input terminal and a voltage output terminal; a voltage offset providing circuit, comprising a first terminal coupled to a first predetermined voltage source, a second terminal coupled to the voltage output terminal, and a third terminal, wherein a voltage at the third terminal is higher than a voltage at the second terminal by an offset voltage; and a voltage control capacitor, comprising a fourth terminal coupled to the third terminal, and a fifth terminal coupled to the voltage input terminal, wherein a capacitance value of the voltage control capacitor corresponds to a voltage difference between a voltage at the fifth terminal and a voltage at the fourth terminal. A better compensation for the amplifier circuit can be acquired since a voltage control capacitor having a capacitance value corresponding to the output voltage of the amplifier is applied.

公开(公告)号：US20200059213A1

公开(公告)日：2020-02-20

申请号：US16104954

申请日：2018-08-20

Applicant: PixArt Imaging Inc.

Inventor： Balasubramaniam Shammugasamy ,  Kei Tee TIEW

IPC: H03F3/45 ,  H03F3/21

Abstract: An amplifier circuit comprising: a first amplifier, comprising a voltage input terminal and a voltage output terminal; a voltage offset providing circuit, comprising a first terminal coupled to a first predetermined voltage source, a second terminal coupled to the voltage output terminal, and a third terminal, wherein a voltage at the third terminal is higher than a voltage at the second terminal by an offset voltage; and a voltage control capacitor, comprising a fourth terminal coupled to the third terminal, and a fifth terminal coupled to the voltage input terminal, wherein a capacitance value of the voltage control capacitor corresponds to a voltage difference between a voltage at the fifth terminal and a voltage at the fourth terminal. A better compensation for the amplifier circuit can be acquired since a voltage control capacitor having a capacitance value corresponding to the output voltage of the amplifier is applied.