ENVELOPE TRACKING SYSTEM WITH INTERNAL POWER AMPLIFIER CHARACTERIZATION

摘要

An RF PA system that generates its own local characterization information. The RF PA system includes a PA to generate a RF output signal from a RF input signal, the PA powered by a supply voltage. A characterization block generates characterization information corresponding to a relationship between the supply voltage and performance (e.g., gain, power efficiency, distortion, receive band noise) of the RF PA system for a plurality of levels of one or more operating conditions (e.g., temperature, operating frequency, modulation format, antennae mismatch, etc.) of the RF PA system. An amplitude estimator block estimates an amplitude of the RF input signal. A supply control block generates a supply voltage control signal for controlling the supply voltage based on the characterization information and the amplitude of the RF input signal.

主权项

1. A radio frequency (RF) power amplifier system comprising:
a power amplifier configured to receive both a supply voltage and a RF input signal and generate a RF output signal; a feedback receiver configured to estimate an amplitude of the RF output signal; a characterization block including a distortion estimator configured to receive the amplitude of the RF output signal, estimate an amount of distortion in the RF output signal, and generate a distortion signal indicative of the amount of distortion in the RF output signal, the characterization block being configured to generate characterization information corresponding to a relationship between the supply voltage and performance of the RF power amplifier system based on the distortion signal; and a supply control block configured to receive the characterization information and generate a supply voltage control signal for controlling the supply voltage to the power amplifier based on the characterization information.