RF power amplifier with total radiated power stabilization

摘要

A radio frequency (RF) amplification circuit and a closed-loop amplitude linearization circuit are disclosed. The RF amplification circuit amplifies an RF signal to generate an amplified RF signal. The RF amplification circuit and the closed-loop amplitude linearization circuit form a fast control loop and a slow control loop. The slow control loop estimates a total radiated power (TRP) from the RF amplification circuit to create a TRP estimate using a representation of the amplified RF signal, and controls a fast loop gain of the fast control loop based on the TRP estimate. The fast control loop applies a gain adjustment to the RF amplification circuit based on the fast loop gain and a difference between a target reference amplitude and a measured feedback amplitude. The gain adjustment controls amplitude distortion in the RF amplification circuit. The fast loop gain controls TRP-drift in the RF amplification circuit.

主权项

1. Circuitry comprising an IC package, which comprises:
a package interface coupled to upstream RF system circuitry; an RF amplification circuit configured to amplify an RF signal to generate an amplified RF signal; and a closed-loop gain linearization circuit, such that the RF amplification circuit and the closed-loop gain linearization circuit form a fast control loop and a slow control loop, wherein:
the slow control loop is configured to:
estimate a total radiated power (TRP) from the RF amplification circuit to create a TRP estimate using a representation of the amplified RF signal; andcontrol a fast loop gain of the fast control loop based on the TRP estimate; andthe fast control loop is configured to apply a gain adjustment to the RF amplification circuit based on the fast loop gain and a difference between a target reference amplitude and a measured feedback amplitude, wherein the gain adjustment controls amplitude distortion in the RF amplification circuit and the fast loop gain controls TRP-drift in the RF amplification circuit, wherein the TRP-drift is at least partially based on Voltage Standing Wave Ratio (VSWR) variations presented to an output from the RF amplification circuit.