> Brendan Moran <bmoran@MILLENNIUM.CA> wrote:
> > As with you, I think I have something that will work, but only more
testing
> > will tell, since we're basically forced to use active components well
> > outside their design frequency (the GaAs FET I'm using is 450MHz to 6GHz
or
> > so)
>
> OK, I have to ask: Why does your FET have a *lower* frequency limit?

You know?  I keep asking myself that, but, hey, that's what they told me.
I'm not an RF engineer, I like digital systems, myself, but I'm stuck with
this project, so I'm doing what I can.

I think the problem is in stability.  When you look at the k-factor which is
derived from the S-parameters, k peaks in about the middle of the frequency
range (the higher k is, the more stable the amplifier is) that it was
designed for.  They haven't even listed S-parameters below 500kHz.

I actually talked to Agilent about this one, and they're the ones that told
me about the minimum frequency restriction (aside from the datasheets, of
course)  I'm using the ATF-33143 for the active component.

I still just don't get *minimum* frequency restrictions on a component...

--Brendan

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