Patent ID: 6556068
Filing Date: 2003-04-29
Classification: G05F,H01L,H03K,Y10S

Abstract:
An integrated circuit differential amplifier with a compensated threshold voltage, comprising:a sense amplifier including a plurality of transistors operably connected to detect and amplify signals provided on complementary lines, the plurality of transistors including at least one target transistor; and a compensation circuit adapted to control the threshold voltage of the at least one target transistor in the differential amplifier circuit to adjust the sensitivity of the differential amplifier circuit, the compensation circuit including: a compensation transistor having a gate, a source, a drain, and a backgate coupled to the drain, wherein the drain of the compensation transistor is connected to a backgate of the at least one target transistor to regulate the threshold voltage of the at least one target transistor; a reference voltage supply coupled to the gate of the compensation transistor; and a constant current source coupled to the drain and the backgate of the compensation transistor and adapted to force current through the compensation transistor to adjust a backgate bias voltage that provides a threshold voltage required to support a drain current in the compensation transistor.