Patent ID: 7330074

Claim:
A differential amplifier comprising: an input stage that generates differential currents in response to a voltage difference between differential input signals; an output stage for generating an output signal at an output node; and a control unit coupled between the input stage and the output stage, wherein the control unit includes a floating current source comprised of a cascode of at least two transistors for biasing the output stage with a quiescent current, and wherein the control unit further includes: a current summing circuit for adjusting an output current through the output stage for determining the output signal in response to the differential currents from the input stage, and wherein the current summing circuit is comprised of: a first cascode current mirror disposed between a high power supply and a first control node; and a second cascode current mirror disposed between a low power supply and a second control node; wherein the input stage is a folded cascode operational transconductance amplifier (OTA).