Patent ID: 6573784
Filing Date: 2003-06-03
Classification: G11C,H03F,H03G

Abstract:
An amplifier circuit used for correlated double sampling, the amplifier circuit comprising:a first transistor having a gate configured to receive an input signal, the first transistor configured to amplify the input signal and to output an amplified input signal; a second transistor coupled to the first transistor, the second transistor having a gate configured to receive the amplified input signal from the first transistor, the second transistor configured to amplify the amplified input signal and to output an output signal, the first and second transistors being complementary; at least two current sources coupled to the first transistor and configured to bias the first transistor in the saturation region of operation; a first load resistor coupled between the first and the second transistors; and a second load resistor coupled between the first load resistor and a bias source, the ratio of the first and second load resistors setting the gain value of the amplifier circuit.