Dual port phase and magnitude balanced synthesizer modulator and method for a transceiver

摘要

A transceiver (10) includes a dual port phase and magnitude balanced synthesizer modulator (60). The modulator (60) couples a modulation input to a voltage controlled oscillator (40) and to a reference oscillator (42) that are coupled together in a phase locked loop (44). The modulator 60 includes a magnitude balancing circuit (64) that divides a modulation input representing data or the like into a first modulation input signal applied to the reference oscillator (42) and a second modulation input signal for the voltage controlled oscillator (40). A phase balancing circuit (68) induces a negative phase shift in the second modulation input signal that is coupled to the voltage controlled oscillator (40) in order to compensate for the phase lag of the reference oscillator loop (44).