Methods and devices for frequency modulation reduction for polar transmitters

Abstract

Systems and techniques are provided for a polar transmitter using a reduced frequency modulation (FM) range. Baseband complex data can be converted into magnitude and phase components by a cartesian-to-polar conversion module. For each respective phase of the phase component, a phase selection can be determined from a plurality of phase selection candidates and used to generate a phase select parameter and a modified phase for the respective phase. A set of clock signals includes a clock signal with a frequency controlled by the modified phase, and one or more shifted clock signals with phase shifts relative to the clock signal. An input clock signal can be selected from the set using the phase select parameter. A power amplifier can be driven by the magnitude component according to the input clock signal to generate a RF signal for transmission by the polar transmitter on a wireless medium.