Patent ID: 9712114
Date: 2017-07-18
CPC Classifications: H03F,H04B

Claim:
1. A power amplifier system comprising: a power supply configured to generate a supply voltage based on an input signal; a power amplifier powered by the supply voltage and configured to amplify the input signal and generate an output signal; a delay determiner coupled to the power amplifier, the delay determiner configured to determine a first delay between the input signal and the output signal when the input signal is below an amplitude threshold, determine a second delay between the input signal and the output signal when the input signal is above the amplitude threshold, the delay determiner configured to determine the first delay and the second delay by detecting at least one of a cross correlation, a peak, a local minimum, a phase, and a zero crossing of the input signal and the output signal, and determine a delay mismatch between the input signal and the supply voltage based on the first delay and the second delay; and a programmable delay block coupled to the delay determiner and configured to compensate for the determined delay mismatch between the input signal and the supply voltage.