Patent ID: 7135928

Claim:
A class AB transconductance block, comprising: a first transconductance stage comprising MOSFET amplification devices operably coupled to produce a first differential current from a differential input voltage based on a first bias voltage; a second transconductance stage comprising MOSFET amplification devices operably coupled to produce a second differential current based on the differential input voltage and a second bias voltage; a third transconductance stage comprising MOSFET amplification devices operably coupled to produce a third differential current based on the differential input voltage and a third bias voltage, wherein output current of the class AB transconductance block is a sum of the first differential current, the second differential current and the third differential current; and a resistor ladder operable as a biasing circuit operably coupled to produce the first bias voltage, the second bias voltage and the third bias voltage, wherein the first bias voltage is greater than the second bias voltage and wherein the second bias voltage is greater than the third bias voltage and wherein each bias voltage for each of the transconductance stage is produced from an output end of a resistor of the resistor ladder.