Patent ID: 8489046

Claim:
A multi-mode communications transmitter, comprising: a signal decomposer, including a cordic converter and a bandwidth reduction unit, said cordic converter configured to convert rectangular-coordinate in-channel (I) and quadrature channel (Q) signals into polar-coordinate amplitude and angle component signals, said bandwidth reduction unit configured to form a first modulation signal from the polar-coordinate amplitude component signal, wherein the first modulation signal has a reduced bandwidth compared to a bandwidth of the polar-coordinate amplitude component signal, wherein said signal decomposer further includes a filter mad a threshold detector configured to detect times when an amplitude represented in said polar-coordinate amplitude component signal exceeds a predetermined amplitude threshold, said threshold detector is further configured to generate an amplitude varying signal representing amplitude information exceeding said amplitude threshold and said filter is configured to reduce the bandwidth of said signal representing amplitude information exceeding said amplitude threshold; a signal combiner configured to form a second modulation signal from a combination of said amplitude and angle component signals, said second modulation signal representing amplitude information falling below said amplitude threshold and angle information in said angle component signal; a power supply controller configured to generate a power supply signal from said first modulation signal; a quadrature modulator configured to form a modulated RF carrier based on said second modulation signal; and an amplifier having a power supply port configured to receive said power supply signal and an RF input port configured to receive said modulated RF carrier signal.