Envelope limiting for a polar modulator. A system is provided that
intelligently compresses the amplitude modulation in a polar modulator so
that it can be implemented with a single-stage variable gain amplifier.
Limiting the amplitude modulation range on the low side prevents collapse
of the transmit signal's time-varying envelope and eases circuit
implementation. Limiting the amplitude modulation range on the high side
reduces the peak-to-average ratio of the waveform and thereby improves
the efficiency of the radio transmitter.