Patent ID: 8633767

Claim:
An amplifier circuit, comprising: an amplifier, arranged for receiving an input signal at an input port and generating an output signal at an output port according to the input signal; and a noise suppression block, coupled between the input port and the output port of the amplifier, the noise suppression block arranged for receiving the input signal and the output signal and applying noise suppression to the output signal generated from the amplifier according to the received input signal and the received output signal; wherein the noise suppression block comprises: a combining circuit, comprising: a first attenuation unit, arranged for attenuating the received input signal and accordingly generating a first attenuated signal; a second attenuation unit, arranged for attenuating the received output signal and accordingly generating a second attenuated signal; and a combining unit, coupled to the first attenuation unit and the second attenuation unit, the combining unit arranged for combining the first attenuated signal and the second attenuated signal, and accordingly generating a combined signal; and an output circuit, coupled between the combining circuit and the output port of the amplifier, the output circuit arranged for generating a noise suppression signal according to the combined signal and applying noise suppression to the output signal by adding the noise suppression signal to the output signal.