A novel apparatus and method of improving the power efficiency of a digital transmitter for
non-constant-amplitude modulation schemes. The power efficiency improvement
mechanism of the invention leverages the high efficiency of a switched-mode power supply
(SMPS) that supplies the high DC current to the transmitter's power amplifier, while
compensating for its limitations using predistortion. The predistortion may be achieved using
any suitable technique such as digital signal processing, hardware techniques, etc. A …