Pseudo-envelope following feedback delay compensation

摘要

A switch mode power supply converter and a feedback delay compensation circuit are disclosed. The switch mode power supply converter has a switching voltage output and provides a switching voltage at the switching voltage output, such that a target voltage for a power amplifier supply voltage at a power amplifier supply output is based on the switching voltage. Further, the switching voltage is based on an early indication of a change of the target voltage. The feedback delay compensation circuit provides the early indication of the change of the target voltage.

主权项

1. Circuitry comprising:
a switch mode power supply converter having a switching voltage output and configured to provide a switching voltage at the switching voltage output, such that a target voltage for a power amplifier supply voltage at a power amplifier supply output is based on the switching voltage, which is based on an early indication of a change of the target voltage; and a feedback delay compensation circuit comprising a high pass filter configured to high pass filter a VRAMP signal to generate a derivative of the VRAMP signal, such that the feedback delay compensation circuit is configured to:
generate a feedback delay compensation signal based on the derivative of the VRAMP signal; andprovide the feedback delay compensation signal to the switch mode power supply converter as the early indication of the change of the target voltage.