Philip de Cadenet wrote:
Hello Tim,
Look for class E. Class D describes an amplifier that switches faster
than the signal and has the output filtered to pass DC. Class E
describes an amplifier that switches _at_ the signal rate and has a
filter that has finite impedance at the fundamental and infinite
impedance at all the odd harmonics. The result is that the output
transistor drives a square-wave voltage and sees a sinusoidal current,
so all the power goes to the output with none wasted.
There have been articles in QEX and even QST -- they even explain what
I just said in sufficient detail to understand it.
Thanks for the information and article links.
I have some articles fromm Sokal and Raab on E. Also familiar with Steve
Coultier's class-E web site.
I have a QEX/QST compilation CD somewhere.
Do you have any month/year references to hand?
Tnx
No, but I've only been reading them for 15 years -- that should narrow
things down a bit.
Sorry (for the lack of info, if not the smartass answer).
--
Tim Wescott
Wescott Design Services
http://www.wescottdesign.com