A direct conversion circuit for radio frequency signals is disclosed. The
circuit includes a pair of quadrature related mixers, a phase shift unit,
and a local oscillator. The pair of quadrature related mixers is coupled
to a radio frequency signal input port for mixing down a radio frequency
input signal. The phase shift unit is in communication with at least one
of the pair of mixers for phase shifting a local oscillator signal. The
local oscillator produces the local oscillator signal. The local
oscillator includes a non-integer frequency multiplier for multiplying the
frequency of a first voltage controlled oscillator signal by a non-integer
value to produce the local oscillator signal.
