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From: Jack Smith
Subject: Re: Problems with Creating a RF Tranformer
X-Newsreader: Forte Agent 1.92/32.572
Date: Fri, 06 Dec 2002 15:28:50 GMT
NNTP-Posting-Date: Fri, 06 Dec 2002 10:28:50 EST
Organization: Cox Communications
On 6 Dec 2002 14:58:57 GMT, Karsten wrote:
>Since a couple of weeks I try to build a RF Transformer but ...
>No Success...... :-(
>Maybe vou can help me.
>I've a Generator which produces a sine-wave : f = 2 MHz
> U = 5 Vpp
> Zout = 50 Ohms.
>The Transformer should convert the Inputvoltage to 300Vpp.
>My task (speculations):
> Determining L of the primery connection (to
>fit the generator output
> Calculate the turn ratio. (in this case 1:60)
> Now it should work! Or not????
> What else do I've to consider??
>How can i minimize the influence of frequency change??
>I would like to sweep a range from 1.5 - 3MHz.
I doubt this is a realizable design as a standard broadband
transformer. With a turns ratio of 60:1, and 50 ohms Zin, the Zo is
180Kohms. At 2 MHz, a shunt stray capacitance of 0.4pF gives you
180KOhms Xc. You are going to have a very difficult time winding
turns with less than 0.4 pF stray C.
You might come closer with a tuned design, but that's going to make
the broadband part of the design unworkable.
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