Patent ID: 7583145

Claim:
An apparatus for generating an output signal according to an input signal, comprising: a signal generating circuit, for receiving the input signal and generating a first control signal comprising a first and a second voltage signal and a second control signal comprising a third and a fourth voltage signal; a first output stage, having a first amplifying configuration, for receiving the first control signal and generating a first output signal according to the first control signal; and a second output stage, having a second amplifying configuration, for receiving the second control signal and generating a second output signal according to the second control signal, wherein the first amplifying configuration is different from the second amplifying configuration; wherein the first output stage is coupled to the second output stage to form an output terminal, the output terminal outputs at least one of the first output signal and the second output signal as the output signal, and the signal generating circuit comprises: a first impedance unit having a first end for providing the third voltage signal and a second end for providing the first voltage signal; a second impedance unit having a first end for providing the second voltage signal and a second end for providing the fourth voltage signal; and a third impedance unit, coupled between the first impedance unit and the second impedance unit, comprising a transistor pair for receiving the input signal.