Re: Low Pass PA Filters--Teach Me

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From: Steve Bauder (sbauder@win.bright.net)
Date: Sun Jan 28 2001 - 13:43:31 CST


Rod:

I think the rule of thumb to figure the load an RF amp wants to see, is
to square the supply voltage and divide it by 2 times the power output.
Can't remember where it's from, but the formula has served me well over
the years.

So for your example, if you're running a 12 volt supply and are
designing for 1 watt output power, looks to me like the amp will want to
see around 75 ohms as a load.

You may want to verify the formula before you start burning up
transistors though!

Steve, nx9z


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