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Superfast Power MOSFETs for a Linear Amp?
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May 6th 04, 05:27 PM
Paul Burridge
Posts: n/a
On 6 May 2004 06:29:13 -0700,
(Steve
Kavanagh) wrote:
Paul:
There is an interesting two part article in QST May & June 1997
describing 300 W and 500 W output Class E (more efficient, non-linear)
amplifiers using a single IRFP440 (300 W) or IRFP450(500 W) at 7 MHz.
Since you are in the UK, there is a brief mention in Radcom (Technical
Topics) August 1997.
Ordinary garden-variety power FETs can also be used for HF linear
amplification using appropriate bias settings - though exactly how
linear they can be in practice I don't know.
Thanks, Steve. It's obviously doable. I haven't checked a Power FET
data sheet yet, but what's the betting they don't quote output
admittances for these devices? :-(
--
The BBC: licenced at public expense to spread lies.
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