Patent ID: 8131248

Claim:
A mixer, comprising: a balun having a local oscillator input and having an in-phase local oscillator output and an out-of-phase local oscillator output; a diplexer having a radio frequency port, an intermediate frequency port, and a common port; a first mixing device having a first port coupled to the in-phase local oscillator output of the balun, and a second port coupled to the common port of the diplexer; a second mixing device having a first port coupled to the out-of-phase local oscillator output of the balun, and a second port coupled to the common port of the diplexer; a first signal sampler having an input coupled to the in-phase local oscillator output of the balun, and providing a sampled in-phase local oscillator signal; a second signal sampler having an input coupled to the out-of-phase local oscillator output of the balun, and providing a sampled out-of-phase local oscillator signal; and means for coupling the sampled in-phase local oscillator signal and the sampled out-of-phase local oscillator signal to the common port of the diplexer.