Patent · US Active

Feed-forward envelope tracking

US10862428B2 · kind B2 · utility

16Cited by

5References

12Claims

0Family size

Assignee

Apple Inc. · US

Inventors

Stephan Henzler · Munich, DE
Andreas Menkhoff · Oberhaching, DE
Thomas Eichler · Munich, DE
Wolfgang Walthes · Munich, DE
Alexander Belitzer · Munich, DE
Yifan Wang · Puchheim, DE

Key dates

Filing date	Sep 25, 2018
Grant date	Dec 8, 2020
Priority date	—
Expiry date	Sep 25, 2038

Classification

Technology area (CPC H)Electricity
CPC primaryH03F2200/511
WIPO fieldBasic communication processes
WIPO sectorElectrical engineering

Abstract

An envelope tracking system for controlling a power amplifier supply voltage includes envelope circuitry and a feed forward digital to analog converter (DAC) circuitry. The envelope circuitry is configured to generate a target envelope signal based on a selected power amplifier supply voltage. The feed forward DAC circuitry includes a voltage source circuitry and a selector circuitry. The voltage source circuitry is configured to generate a plurality of voltages. The selector circuitry is configured to select one of the plurality of voltages based at least on the target envelope signal. The feed forward DAC circuitry is configured to provide the selected voltage to a supply voltage input of a power amplifier that amplifies a radio frequency (RF) transmit signal.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.