Patent ID: 11929720
Assignee: QORVO US, INC.
Field: Basic communication processes (Electrical engineering)
Classification: CPC H | IPC H

Claim 9:
10. Envelope power supply circuitry comprising:
envelope tracking power supply circuitry configured to provide an envelope power supply voltage based on a power envelope of a radio frequency input signal for a radio frequency power amplifier such that a delay between the envelope power supply voltage and the radio frequency input signal is based on a delay compensation control signal; and
delay estimation circuitry comprising:
programmable delay circuitry configured to delay a first signal by an amount determined by a delay control signal;
comparator circuitry coupled to the programmable delay circuitry and configured to:
detect when a magnitude of the first signal from the programmable delay circuitry crosses a threshold value; and
provide a measurement indicator signal in response to the magnitude of the first signal crossing the threshold value;

sample and hold circuitry coupled to the comparator circuitry and configured to sample and hold a magnitude of a second signal in response to the measurement indicator signal;
difference calculation circuitry configured to:
calculate a difference between subsequent measurements of the magnitude of the second signal; and
provide a difference signal based on the difference; and

delay control circuitry coupled to the difference calculation circuitry and configured to:
calculate a delay between the first signal and the second signal based on changes in the difference signal over time;
provide the delay compensation control signal based on the delay between the first signal and the second signal; and
provide the delay control signal based on the changes in the difference signal over time.