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Re: [Amps] RF power transistor curve trace question

Subject: Re: [Amps] RF power transistor curve trace question
From: Steve Thompson <>
Date: Wed, 17 Jun 2009 12:21:59 +0100
List-post: <">>
> 2. I do not know about transistor ballasting. Is there a standard way to 
> measure it? Are there standard values? What value would be sufficient to 
> operate in class AB?

A method I used when on the manufacturing side was to put a 
defined current (typically a few 100s mA) through the b-e junction 
then measure the c-e voltage with a DVM. To all intents and 
purposes the voltage you measure is that across the emitter 
resistor so, knowing the current, you can calculate Re. Expect 
values in the low tenths of ohms.

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