Patent ID: 7859332

Claim:
An audio amplification circuit comprising: a signal input configured to receive an input signal; a first reference circuit configured to form a first reference voltage at biasing node; a control circuit configured to set a first operating mode of the audio amplification circuit and set a second operating mode of the audio amplification circuit; a current source configured to selectively provide a first current to the biasing node and to the signal input responsively to the first operating mode; a first amplifier having a first input coupled to receive the first reference voltage, a second input configured to selectively couple the first amplifier in a follower configuration with a first gain responsively to the first operating mode, and an output coupled to drive a first output of the audio amplification circuit; and a second amplifier having a first input coupled to receive the first reference voltage, a second input configured to selectively couple the second amplifier in a follower configuration with the first gain responsively to the first operating mode, and an output coupled to drive a second output of the audio amplification circuit.