Patent ID: 7538617

Claim:
An amplifier circuit, comprising: a first supply terminal ( 12 ) and a second supply terminal ( 14 ) for supplying the circuit a first supply potential (Vss) and a second supply potential (Vdd), an output stage with a first output node ( 16 ) and a second output node ( 18 ) for outputting a differential output signal (Voutn, Voutp), wherein the first output node ( 16 ) is connected via a first output transistor (T 1 ) with the first supply terminal ( 12 ), and via a second output transistor (T 2 ) with the second supply terminal ( 14 ), and wherein the second output node ( 18 ) is connected via a third output transistor (T 3 ) with the first supply terminal ( 12 ), and via a fourth output transistor (T 4 ) with the second supply terminal ( 14 ), and a control stage, to which an input signal (Vinn, Vinp) can be applied to control the output transistors (T 1 -T 4 ), for adjusting quiescent currents flowing through the output transistors (T 1 -T 4 ), even in the absence of the input signal (Vinn, Vinp), and for adjusting the output signal (Voutn, Voutp) as a function of the input signal (Vinn, Vinp), and a control path feeding back into the control stage for combining the quiescent currents of the output transistors (T 1 -T 4 ) and a common mode potential of the differential output signal (Voutn, Voutp).