Patent ID: 6959179

Claim:
A radio frequency (RF) down/up-conversion circuit comprising: a local oscillator chopping circuit comprising: a frequency divider circuit capable of receiving a first local oscillator (LO) signal having a frequency of LO and generating therefrom a frequency-divided second local oscillator (LO) signal having a frequency of LO/N and synchronized with said first LO signal; and a multiplier capable of receiving said first and second LO signals and generating a signal that during selected periods of time has a signal polarity that is reversed relative to a signal polarity of said first LO signal; and a differential radio frequency (RF) mixer having a first differential input port capable of receiving said signal from said multiplier and a second differential input port capable of receiving a first differential modulated radio frequency (RF) signal and a second differential modulated radio frequency (RF) signal, wherein said differential RF mixer generates a differential output signal.