Noise conversion gain limited RF power amplifier

摘要

A radio frequency (RF) power amplifier (PA) and an envelope tracking power supply are disclosed. The RF PA receives and amplifies an RF input signal to provide an RF transmit signal using an envelope power supply voltage. The envelope tracking power supply provides the envelope power supply voltage based on a setpoint, which has been constrained so as to limit a noise conversion gain (NCG) of the RF PA to not exceed a target NCG.

主权项

1. Circuitry comprising:
envelope control circuitry configured to provide an envelope power supply control signal; and a radio frequency (RF) modulator configured to provide an RF input signal, wherein:
an RF power amplifier (PA) is configured to receive and amplify the RF input signal to provide an RF transmit signal using an envelope power supply voltage;an envelope tracking power supply is configured to provide the envelope power supply voltage based on a setpoint, which has been constrained to limit a noise conversion gain (NCG) of the RF PA to not exceed a target NCG, wherein the envelope power supply voltage at least partially tracks an envelope of the RF transmit signal; andRF transceiver circuitry comprises the envelope control circuitry and the RF modulator, such that the setpoint, which has been constrained to limit the NCG of the RF PA, is a constrained setpoint, such that the RF transceiver circuitry is configured to provide the constrained setpoint to the envelope tracking power supply via the envelope power supply control signal.