| 摘要 |
A class AB amplifier circuit with combined quiescent current and common mode control is provided to prevent any coupling between separate control loops by combining two control functions in one and the same control path. First and second supply terminals(12,14) supply a first supply potential(Vss) and a second supply potential(Vdd) to an amplifier circuit. An output stage has a first output node(16) and a second output node(18) for output of differential output signals(Voutn,Voutp). The first output node is connected to the first supply terminal and the second supply terminal via first and second output transistors(T1,T2), respectively. The second output node is connected to the first supply terminal and the second supply terminal via third and fourth output transistors(T3,T4). A control stage is input with an input signal(Vinn,Vinp) to control the output transistors. A control path is fed back into the control stage for the combined control of the quiescent currents of the output transistors and a common mode potential of the differential output signal.
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