An integrated circuit radio transceiver comprises an integrated phase
shift mixer for generating a phase and frequency shifted output signal to
at least a portion of one of a transmitter or receiver front end. The
integrated phase shift mixer includes a phase shift block that is
operable to produce a phase shifted current signal at an output of the
phase shift block and a mixer that is operable to produce the phase and
frequency shifted output signal based upon the phase shifted current
signal. One aspect of the present invention is that the phase shift block
produces an output as a current signal and the mixer block is operably
disposed and formed to receive the current signal produced by the phase
shift block. Thus, the mixer includes a folded cascode mixer that
provides a substantially low input impedance.