Envelope Path Pre-distortion for Wideband Transmitter Systems

摘要

A communication device, such as a smart phone, includes an envelope tracking power supply modulator. The envelope tracking power supply modulator receives an envelope tracking reference signal. A baseband controller pre-distorts the envelope tracking reference signal responsive to distortion caused by the envelope tracking power supply modulator. For instance, the pre-distortion may modify the nominal envelope tracking reference signal so that, after the modulator acts on the modified reference signal, the output of the modulator has increased linearity.

主权项

1. A device comprising:
a baseband controller; and a supply modulator operable to:
receive an envelope tracking reference signal from the baseband controller;generate, according to a linearity characteristic, an envelope tracking power supply signal responsive to the envelope tracking reference signal; andprovide an envelope sense signal that reflects the linearity characteristic; where the baseband controller is configured to:
receive the envelope sense signal; andpre-distort the envelope tracking reference signal responsive to the linearity characteristic.