Author Topic: help: Search-fu "class e"  (Read 867 times)

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Offline innkeeperTopic starter

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help: Search-fu "class e"
« on: August 18, 2022, 12:32:09 am »
i am trying to gleam the forum wisdom on the topic of Class E amplifiers
Class E
as a search term tells me i have to have worse longer then 1 letter
"class e" comes back with other things then the word class followed by an E but E anypalce else in the post
I'm kinda getting around this using the google search function but, is there some searchfu way of doing this within the forum search?
Hobbyist and a retired engineer and possibly a test equipment addict, though, searching for the equipment to test for that.

Offline oPossum

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Offline fourfathom

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Re: help: Search-fu "class e"
« Reply #2 on: August 18, 2022, 01:15:43 am »
Here is one of the original articles about Class-E RF amplifiers:
And what looks like a good video:

All of these popped up when I googled: "class e rf amplifier"

I've built a few low-power Class-E amps (1-2W, 10 MHz region) and they work quite well.  I measured 98% efficiency on one of them, and it let me get 1.2W using two SOT fets in parallel.  The fets ran just a few degrees over ambient.  You will find many equations out there, loosely based on Sokol's work, but I've found that they need to be tweaked a little for low-power design (or perhaps my input parameters aren't quite accurate?) ( has a decent Class-E calculator you can download.  It uses "saturation voltage" instead of FET on-resistance, but the values it puts out seem to work well.  I've also built a few spreadsheet calculators using the Sokol (and other) equations found here and there on the net.
« Last Edit: August 18, 2022, 01:22:21 am by fourfathom »
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