editor's blog
Subscribe Now

Tracking the Envelope

For the last couple years, “envelope tracking” has caught on as a way to reduce power in phones, cellular base stations, and digital broadcast transmitters. The idea is that RF power amplifiers are most efficient when the signal amplitude runs near the drain voltage, operating in or near saturation or “compression.” When the signal isn’t running that high, then, with a constant power level on the amplifier, the remainder of that power is wasted as heat.

With envelope tracking (ET), the signal envelope is detected and fed to a power modulator that keeps the power amp’s voltage supply in the range of the signal it’s fed.

The OpenET Alliance exists to promote ET and facilitate an ET ecosystem. Towards that end, it just released a set of IP blocks for critical parts of the design. Of course, access to these blocks is touted as a benefit of membership (and, indeed, “… exceed[ing] the value of the first year’s membership fees…”).

More info in their release

Leave a Reply

featured blogs
May 18, 2018
https://youtu.be/O1r7cqyVm90 I was on China24 on CGTNAmerica earlier this week, being interviewed about the Chinese Semiconductor Industry. www.breakfastbytes.com Sign up for Sunday Brunch, the weekly Breakfast Bytes email....
May 17, 2018
Just about everybody wishes they had more time to pursue a hobby or a side project.  Some aspire to be painters or furniture makers.  Others like to rebuild cars.  Even others enjoy electronics in any form. The Maker Movement attracts and caters to tinkerers, hobbyists, st...