Patent ID: 8766698

Claim:
A return-type current reuse frequency mixer, comprising: a transconductance/amplifier stage and a mixer stage connected in sequence, the transconductance/amplifier stage amplifies an input radio frequency signal, and the amplified radio frequency signal passes through the mixer stage to produce and output an intermediate frequency signal; the intermediate frequency signal is fed back to an input terminal of the transconductance/amplifier stage and the intermediate frequency signal is also output as a final intermediate frequency signal output after being amplified by the transconductance/amplifier stage; and a high-pass filter network is serially connected between the transconductance/amplifier stage and the mixer stage, to block the intermediate frequency signal; a low-pass filter network is serially connected between the output terminal of the mixer stage and the transconductance/amplifier stage, to block the radio frequency signal; wherein the transconductance/amplifier stage includes a current reuse stage, and serves as a transconductance stage for the radio frequency signal and an amplifier stage for the intermediate frequency signal.