Frequency modulation using a zero hz vco

摘要

Method and system are disclosed for modulating a radio frequency carrier signal. The radio frequency carrier signal is modulated using a VCO running at a center frequency of 0 Hz. A baseband signal is used to adjust the overall frequency of the VCO. The output of the VCO is a complex baseband signal having in-phase and quadrature components. The in-phase and quadrature components of the baseband signal arc used to modulate the in-phase and quadrature components of the radio frequency carrier signal, respectively.