| 摘要 |
A push-pull amplifier having low output impedance and low crossover distorti on is provided. A least one of a current through a sourcing current path of an output stage and a current through a sinking current path of the output stag e is determinative of a quiescent current control signal produced for controlling a quiescent current of the amplifier. The quiescent current is controlled by symmetrically controlling a bias voltage applied to a sourcing active output device and a bias voltage applied to a sinking active output device in response to the quiescent current control signal. An output stage sourcing control signal for controlling the sourcing active output device is referenced directly to a shared terminal of the sourcing active output devic e, and an output stage sinking control signal for controlling the sinking activ e output device is referenced directly to a shared terminal of the sinking active output device.
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