A mixer circuit is disclosed that includes a first mixer stage including
first and second transmission gates. The mixer circuit also includes a
second mixer stage including third and fourth transmission gates. The
mixer further includes a first base band signal terminal coupled with the
first and second transmission gates and a second base band signal
terminal coupled with the third and fourth transmission gates. The mixer
circuit processes signals so as to mix a base band signal communicated to
the first and second base band signal terminals with a differential LO
signal communicated to first and second LO signal terminals to create a
first mixed differential signal. Alternatively, the mixer extracts a base
band signal from a mixed signal communicated to the first and second
mixed signal terminals signal using the LO signal communicated to the
first and second LO signal terminals.