Patent ID: 10735034

Abstract:
A wideband polar modulation transmitter includes a power amplifier (PA), a PA driver, a dynamic power supply (DPS), a PA driver VH controller, and a phase modulator. The phase modulator modulates a radio frequency (RF) carrier by an input phase modulating signal PM(t) to produce a phase modulated RF carrier. Meanwhile, the DPS produces a DPS voltage for the PA that follows an input amplitude modulating signal AM(t). Using the phase modulated RF carrier, the PA driver generates a PA drive signal VDRV for driving the PA. The PA drive signal VDRV has a high drive level VH and a low drive level VL. The PA driver VH controller is configured to control the magnitude of the high drive level VH so that it remains sufficiently high to force the PA to operate in a compressed mode (C-mode) most of the time but lowers the high drive level VH to force the PA to operate in a product mode (P-mode) during times low-magnitude events occur in the DPS voltage.