US Patent No. 10,716,080

CALIBRATION TECHNIQUES FOR ENVELOPE TRACKING POWER AMPLIFIERS


Patent No. 10,716,080
Issue Date July 14, 2020
Title Calibration Techniques For Envelope Tracking Power Amplifiers
Inventorship Dan Wolberg, Moshav Yanov (IL)
Shai Rachamim, Yavne (IL)
Assignee APPLE INC., Cupertino, CA (US)

Claim of US Patent No. 10,716,080

1. A method of calibrating a wireless transmitting device, comprising:determining a propagation delay mismatch between a first test signal on a first signal path of the wireless transmitting device and a second test signal on a second signal path of the wireless transmitting device, wherein determining the propagation delay mismatch comprises:
transmitting the first test signal having a first frequency on the first signal path;
transmitting the second test signal having a second frequency different from the first frequency on the second signal path;
measuring a phase difference between the first test signal and the second test signal; and
determining a delay measurement between the first test signal and the
second test signal based at least in part on the measured phase difference;
determining the propagation delay mismatch using a difference between the delay measurement and a previously determined delay measurement; and
adjusting delay circuitry of at least one of the first signal path and the second signal path to compensate for the propagation delay mismatch.