Patent ID: 7898330

Claim:
In an amplifier system, first and second circuits comprising: the first circuit of transistors of a first conductivity type having two current inputs INA and IN 2 , and three current outputs OUTA 1 , OUTA 2 and OUT 2 ; wherein the output current OUT 2 is proportional to and mirrored from the input current IN 2 ; the output current OUTA 2 is proportional to the sum of first and second currents, the first current being mirrored from the input current INA and the second current being mirrored from the current in output OUTA 1 ; the second circuit duplicating the first circuit using transistors of a second conductivity type; the current OUTA 1 of the second circuit being a quiescent bias current; the input INA of the first circuit being coupled to the output OUTA 1 of the second circuit, and the input INA of the second circuit being coupled to the output OUTA 1 of the first circuit.