Patent ID: 6999747

Claim:
A passive harmonic mixer for outputting a differential baseband signal according to a differential RF signal received from a first input node and a second input node,comprising: a first switch pair for selectively connecting a first input node to a first output node depending on a first differential local oscillator signal; a second switch pair for selectively connecting the first input node to a second output node depending on a second differential local oscillator signal; a third switch pair for selectively connecting a second input node to the first output node depending on the second differential local oscillator signal; and a fourth switch pair for selectively connecting the second input node to the second output node depending on the first differential local oscillator signal; wherein the first and the second input nodes are for receiving the differential RF signal and the first and the second output node are for outputting the differential baseband signal; wherein the frequency of each of the first differential local oscillator signal and the second differential local oscillator signal is half of the frequency of the differential RF signal; wherein the phase of the first differential local oscillator signal and that of the second differential local oscillator signal are shifted by 90 degrees.