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[Amps] bipolar input and output impedance

Subject: [Amps] bipolar input and output impedance
From: Steve Thompson <>
Date: Fri, 05 Jun 2009 08:56:29 +0100
List-post: <">>
MRF454 is a 12V transistor, TH430 runs from 45-50V. Follow 
Manfred's calculations and the transformer ratios will drop out. 
Motorola App note AN758 has a comprehensive design description 
that should be relevant to TH430s.


> What are the bipolar HF power transistor specs that influence or 
> determine the input and output impedance? I have an ENI circuit using 
> TH430 transistors with 4:1 input and output transformers, the EB-63 
> circuit based on MRF 454s uses 16:1 transformers. What transistor 
> parameters influence transformer design?
> Thanks - Dan
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