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RE: ratio for interstage

Posted by Tre' (P) on May 14, 2016 at 14:51:08

In Reply to: ratio for interstage posted by Tubenstein on May 14, 2016 at 13:06:16:

Both have a 1:1 turns ratio.

I've never fully understood the impedance ratings of transformers.

Transformers don't really have impedance. They have winding ratios.

The impedance ratio is the square of the winding ratio.

So for a step up or step down transformer the reflected primary impedance is the load impedance times the impedance ratio.

The primary inductance has to be high enough to keep the inductive reactance high enough to "stay out of the way" to the lowest frequency of interest.

The shunt capacitance has to be low in value, low enough to keep the capacitive reactance high enough to "stay out of the way" to the highest frequency of interest.

I guess the impedance rating of a transformer has something to do with that. That is to say, the impedance the transformers were made to work with.

I would think that would have to do with the output impedance of your driver stage.

Tre'

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Edits: 05/14/16 05/14/16 05/14/16

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