Patent ID: 8270916

Claim:
A power tuning method that is applied to a power amplifier (PA) prior to normal operation, comprising: a) applying a magnitude control signal to a magnitude control input of an amplitude modulator configured to control a magnitude of an amplitude-modulated power supply signal applied to a power supply port of the PA; b) applying an amplitude control signal to an amplitude control input of an amplitude control circuit configured to control an input power of a constant-envelope phase-modulated carrier signal applied to a signal input of the PA; c) setting the input power of the constant-envelope phase-modulated carrier signal to a predefined value determined by a function characterizing input-output power characteristics of the PA; d) measuring an actual output power of an output signal at a signal output of the PA; e) determining whether the actual output power is within a desired precision of a target output power; f) modifying the magnitude control signal, if it is determined that the actual output power is not within the desired precision of the target output power, by one of increasing the magnitude control signal if the actual output power is lower than the target output power and reducing the magnitude control signal if the actual output power is higher than the target output power; g) determining whether the magnitude control signal has been reduced to a minimum allowable value and if the value of the magnitude control signal has been reduced to the minimum allowable value, reducing the input power of the constant-envelope phase-modulated carrier signal, instead of reducing the magnitude control signal below the minimum allowable value; h) repeating steps d) through g) until the actual output power is within the desired precision of the target output power; and j) calculating polynomial coefficients from the values of the magnitude control signal and input power after it is determined that the actual output power is within the desired precision of the target output power.