The present disclosure relates to multi-mode RF circuitry using a single IQ modulator topology that may support different communication standards, including enhanced data rates for global system for mobile communications evolution (EDGE) and EDGE evolution by dividing certain modulation functions between a frequency synthesizer and an IQ modulator. Specifically, during a standard modulation mode, which may be used to support many communications standards, the frequency synthesizer provides an un-modulated RF carrier signal to the IQ modulator, which either phase modulates or phase and amplitude modulates the un-modulated RF carrier signal to provide a standard modulated RF signal. During a small signal polar modulation mode, which may be used to support the EDGE and EDGE evolution protocols, the frequency synthesizer provides a phase-modulated RF carrier signal to the IQ modulator, which may or may not amplitude modulate the phase-modulated RF carrier signal to provide a small signal polar modulated RF signal.