Patent ID: 7834699

Claim:
An audio amplification method, comprising: receiving a reference voltage and an input signal; generating a compensated reference voltage based on the input signal, the reference voltage and the output signal; and providing a class AB power amplifier to amplify the input signal into the output signal based on the compensated reference voltage, wherein generation of the compensated reference voltage comprises: providing a first operational amplifier, having a first positive input end, a first negative input end and a first output end; the first positive end receiving the reference voltage; the first negative input end receiving the output signal via a first resistance device, and the input signal via a second resistance device; and coupling the first ouput end to the first negative input end via a third resistance device, wherein the class AB power amplifier comprises a third output end and amplification performed by the class AB power amplifier comprises: providing a second operational amplifier having a second positive input end, a second negative input and a second output end coupled to the third output end; the second positive input end receiving the compensated reference voltage; the second negative input end receiving the input signal via a fourth resistance device; the third output via coupling to the second negative input end via a fifth resistance device; and the third output ending outputting the output signal.