Patent ID: 6990164
Filing Date: 2006-01-24
Classification: H03L

Abstract:
1. A frequency synthesizer comprising: a charge pump receiving a difference signal and providing an error compensation charge sample in response to said difference signal; loop filter filtering said error compensation charge sample to provide a control voltage; a dual port voltage control oscillator (VCO) receiving said control voltage from said loop filter, wherein said dual port VCO comprises at least one pair of transconductance inverting amplifiers cross coupled and providing at least a pair of complementary outputs; an integrator comparing said control voltage to a reference voltage and providing an integrated error compensation voltage to said dual port VCO in response to said comparison, said dual port VCO providing an output frequency determined by said control voltage and said integrated error compensation voltage; and a frequency divider dividing said output frequency by at least unity, said difference signal resulting from an input reference signal being combined with said divided frequency.