According to one embodiment, a radio frequency receiver includes a
quadrature mixer for converting radio frequency signals to baseband
signals or intermediate frequency signals. The quadrature mixer includes
an in-phase passive mixer and a quadrature-phase passive mixer. Each
passive mixer includes a mixer core having a plurality of mixer input
switch transistors and a plurality of output switch transistors connected
to the mixer input switch transistors. Clock circuitry generates a first
set of clock signals and a second set of clock signals. The first set of
clock signals has a frequency twice that of the second set of clock
signals. The first set of clock signals is arranged to drive the mixer
input switch transistors and the second set of clock signals is arranged
to drive the output switch transistors.