Patent ID: 6504432
Filing Date: 2003-01-07
Classification: H03F

Abstract:
A tunable, dynamic, self-biasing differential amplifier comprises:amplifier circuit having a first regulated current source, a second regulated current source, a first input transistor, and a second input transistor, wherein the first input transistor is coupled in series with the first regulated current source, wherein the second input transistor is coupled in series with the second regulated current source, wherein a node of the series coupling between the first regulated current source and the first input transistor forms one node of a differential output, wherein a node of the series coupling between the second regulated current source and the second input transistor forms another node of the differential output, and wherein the first and second input transistors receive a differential input; current mirror operably coupled to the first and second regulated current sources, wherein current through the current mirror regulates the first and second regulated current sources; dynamic current regulator operably coupled to provide a regulated current to the current mirror, wherein the dynamic current regulator produces the regulated current based on common mode of the differential input; and dynamic output common mode regulator operably coupled to provide a common mode error signal to the current mirror, wherein the dynamic output common mode regulator produces the common mode error signal based on common mode of the differential output, and wherein the common mode error signal adjusts the current through the current mirror.