May 5th 04, 06:28 PM
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On 5 May 2004 09:34:17 -0700, (Tom Bruhns) wrote:
Okay, thanks all and keep it comin'. I had no idea there were power
FETs capable of UHF. I'll follow any links given and investigate.
Do you want a linear amp (per the subject line) or a class C amp?
They're not the same critter.
Technically you're right, of course. I want to make an amp that
operates in Class C - yeah, I know that mode's the antithesis of
linear but over here in Britain, these bolt-on after market boosters -
though running in Class C., are knowns as "linears." I don't
understand it either.
Class C RF amps are basically switching on and off at high speed, so
it seemed like a job better suited to a power FET since power RF BJTs
are pretty expensive. Of course, I can now gather than the same
situation pertains with FETs as well.
There was an article in QEX just one issue ago about a P-P power
MOSFET amplifier for 7MHz.
It'd be fun to see just how fast you can force current in and out of
an ordinary, GP power MOS FET gate to get it switching as fast as
possible, I reckon, before pressing ahead with the dedicated devices.
--
The BBC: licenced at public expense to spread lies.
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