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Transistorized "cascode" RF amp?

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April 5th 04, 11:50 AM

Jan-Martin Noeding, LA8AK

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On 4 Apr 2004 12:07:18 -0700, (Tom Bruhns) wrote:

Do you have specific requirements? You may well be able to do fine
with a different, simpler design. I'd submit your requirement is not
for a cascode, but for specific TOI and perhaps harmonic performance
and noise level and input and output impedances.

Cheers,
Tom

I really suspect that it is outlined an amplifier which it is not
expereinced whether it is needed or not, I believe it is no need for
extra amplification below 15 or 20MHz, and since the frame antenna is
relatively narrow banded it is no need for particularly good IP3
characteristics on any frequencies

Somebody once mentioned that a transistor with 50mA collector current
equalled a valve amplifier with 5mA anode current in respect of IP3,
wonder such is likely to be true? Suggested valve is 6761 with
gm=50mmho

73
Jan-Martin
LA8AK
http://home.online.no/~la8ak/e.htm
----
Jan-Martin, LA8AK, N-4623 Kristiansand
http://home.online.no/~la8ak/

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