GROUP DELAY CALIBRATION OF RF ENVELOPE TRACKING

摘要

An RF communications system, which includes an RF power amplifier, an envelope tracking power supply, and supply control circuitry, is disclosed. The RF communications system operates in one of a normal operation mode and a calibration mode. During the calibration mode, the RF power amplifier receives and amplifies an RF input signal to provide an RF transmit signal using an envelope power supply signal, which is provided by the envelope tracking power supply. Further, the supply control circuitry controls the envelope tracking power supply to cause a sharp transition of the envelope power supply signal when a setpoint of the envelope power supply signal transitions through a setpoint threshold of the envelope power supply signal.

主权项

1. An apparatus comprising an RF power amplifier, an envelope tracking power supply, and supply control circuitry; and configured to operate in one of a normal operation mode and a calibration mode, such that during the calibration mode:
the RF power amplifier is configured to receive and amplify an RF input signal to provide an RF transmit signal using an envelope power supply signal; and the supply control circuitry is configured to control the envelope tracking power supply to cause a sharp transition of the envelope power supply signal when a setpoint of the envelope power supply signal transitions through a setpoint threshold of the envelope power supply signal, wherein a maximum rate of change of the envelope power supply signal during the sharp transition is greater than a maximum rate of change of the envelope power supply signal during the normal operation mode.