| CPC H03F 1/0211 (2013.01) [H03F 1/083 (2013.01); H03K 17/687 (2013.01)] | 20 Claims |
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1. A semiconductor device, comprising:
an amplifier configured to amplify a first input signal and a second input signal and output a first output signal and a second output signal,
wherein the amplifier comprises:
a first amplification circuit configured to output a first amplification signal and a second amplification signal by amplifying the first input signal and the second input signal;
a second amplification circuit including a first amplification transistor turned on based on the first amplification signal to generate a first output signal, a second amplification transistor turned on based on the second amplification signal to output a second output signal, and a first bias transistor turned on based on a first bias signal to generate the first output signal;
a first filter circuit including a first bias capacitor connected to the first amplification transistor and the first bias transistor to generate the first bias signal using a first bias voltage; and
a common mode feedback circuit configured to receive the first and second output signals and output a feedback signal that adjusts an average of the first and second output signals to correspond to a reference signal, to the first amplifier,
wherein the first filter circuit adjusts a voltage of the first bias capacitor such that a first voltage of the first bias capacitor in a disabled state in which the amplifier does not perform an amplification operation corresponds to a second voltage of the first bias capacitor in an enabled state in which the amplifier performs the amplification operation.
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