US 12,146,999 B2
Amplifier for dark noise compensation
Huabin Cheng, Shenzhen (CN); Zhigang Wang, Shenzhen (CN); and Xin Li, Shenzhen (CN)
Assigned to SHENZHEN XPECTVISION TECHNOLOGY CO., LTD., Shenzhen (CN)
Filed by SHENZHEN XPECTVISION TECHNOLOGY CO., LTD., Shenzhen (CN)
Filed on Jan. 11, 2022, as Appl. No. 17/572,715.
Application 17/572,715 is a continuation of application No. PCT/CN2019/098160, filed on Jul. 29, 2019.
Prior Publication US 2022/0128719 A1, Apr. 28, 2022
Int. Cl. G01T 1/24 (2006.01); H03F 3/45 (2006.01)
CPC G01T 1/247 (2013.01) [H03F 3/45475 (2013.01)] 16 Claims
OG exemplary drawing
 
1. An amplifier, comprising:
an op-amp configured to receive at an input thereof a first electric current;
a first MOS capacitor connected to the input and an output of the op-amp;
an adjustable current source feeding a second electric current to the input;
wherein the adjustable current source is adjustable by an electric signal;
wherein the adjustable current source comprises a second MOS capacitor;
wherein the adjustable current source comprises a third MOS capacitor in parallel to the second MOS capacitor; wherein a gate electrode of the second MOS capacitor is connected to the input and a bulk contact of the third MOS capacitor is connected to the input; wherein a gate electrode of the third MOS capacitor is connected to the input of the op-amp and a bulk contact of the third MOS capacitor is connected to the electric signal.