[Amps] help with mosfet power amp
Dan Sawyer
dansawyer at earthlink.net
Sun Apr 25 18:41:12 EDT 2004
All,
I need help in learning how to handle and bring up a power mosfet amp. I
have purchased a single stage power amp with 2 MRF154's. The amp has
three inputs, power, RF in, and RF out. The power input is 50V. I want
to be careful and not do anything foolish.
1. Can I simply apply 50V to the power input?? About what range should
the input current be??
2. Is it better to start with 24V??
3. This amp is not broad band across 2 to 50 MHZ. How can the freq range
be determined?
4. The amp is a 'simple' design and looks similar but is not a copy of
the Mot. app note. Is it feasible to broad band such and amp? Is freq
response primarily a function of the input and output transformers??
5. Most MOSFET power amps appear to have an LR feedback circuit from the
drains to the gates. What is the purpose of this circuit??
Thanks,
Dan
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