Envelope Tracking - Envelope Elimination/Restoration for high efficiency power amplifier

This repository hosts several projects, all of them trying to enhance the efficiency of an RF power amplifier

• The most advanced one is the result of the work of DJ1MR, using the OpenHPSDR firmware.
• The DK7XL directory is a variant of this design
• A second project, by Manfred XQ6FOD, is still under development. Also based on an OpenHPSDR compatible firmware writtent by Pavel Demin and dedicated to Red Pitaya users.
• A specific subdirectory hosts a conversation (email thread in pdf format) between the main ET/EER experimenters(DJ1MR, K1LI, VK6PH). A careful reading of this technical discussion is recommanded to understand the many hindrances (and proposed solutions) of such a project.

This subdirectory also contains the datasheet of an evaluation board sold by GAN systems. This board could be a replacement for the PWM command & control of the power supply

A preliminary reading of the Tor project wiki page is also highly recommanded

http://openhpsdr.org/wiki/index.php?title=THOR

For a general overview of EER/ET combined with pre-distortion feedback principle, please refer to a QEX published paper

http://www.arrl.org/files/file/QEX_Next_Issue/Mar-Apr2017/MBF.pdf

also written by Brian K1LI and Tony K1KP

All of these projects are freely documented and given to the Ham Radio community but the intellectual property of each belongs to their respective authors and publishers or are subject to the TAPR Open Hardware licencing model.