Patent ID: 8190117

Claim:
A mixer circuit comprising: a voltage-to-current converter which converts a positive phase input voltage signal and a reversed phase input voltage signal input to a first input terminal and a second input terminal into a positive phase current signal and a reversed phase current signal, respectively; a switching circuit which includes a first common terminal and a second common terminal receiving the positive phase current signal and the reversed phase current signal and a first local terminal and a second local terminal receiving a positive phase local signal and a reversed phase local signal, respectively, switches over the positive phase current signal and the reversed phase current signal according to the positive phase local signal and the reversed phase local signal, and generates a positive phase output current signal and a reversed phase output current signal; and an impedance element connected between the first common terminal and the second common terminal, having a relatively high impedance to a differential-mode signal between the positive phase current signal and the reversed phase current signal, and having a relatively low impedance to a common-mode signal between the positive phase current signal and the reversed phase current signal.