Patent ID: 7738852
Filing Date: 2010-06-15
Classification: H03D

Abstract:
1. A mixer, comprising: a switching circuit, having a first pair of differential signal nodes and a second pair of differential signal nodes, for switching according to a local oscillation signal; an amplifying stage circuit, coupled to the first pair of differential signal nodes, for receiving an input signal and amplifying the input signal; a load circuit, coupled to the second pair of differential signal nodes, for serving as the loading of the mixer and generating an output signal of the mixer; a common-mode feedback circuit, for receiving the output signal and generating a feedback signal according to the output signal; a first current source, coupled to a first node of the first pair of differential signal nodes, for receiving the feedback signal and generating a first current according to the feedback signal; and a second current source, coupled to a second node of the first pair of differential signal nodes, for receiving the feedback signal and generating a second current according to the feedback signal.