Kevin Weddle Posted November 16, 2010 Report Share Posted November 16, 2010 Do RF coupling transformers ever step up or step down voltage? I have only seen them used in a few applications. Are they inefficient signal coupling devices? Quote Link to comment Share on other sites More sharing options...
Hero999 Posted November 16, 2010 Report Share Posted November 16, 2010 If you look at the impedance matching transformer article on Wikipedia, you should be able to figure it out for yourself. Quote Link to comment Share on other sites More sharing options...
Kevin Weddle Posted November 17, 2010 Author Report Share Posted November 17, 2010 Impedance matching transformers don't match impedances at RF frequencies. RF range transformers used for signal coupling are often step down transformers which increase load impedance, or they are used mainly for resonance. But they are hardly ever used in many circuits. Is it because they produce signal distortion? Quote Link to comment Share on other sites More sharing options...
Hero999 Posted November 17, 2010 Report Share Posted November 17, 2010 You obviously didn't bother to search Wikipedia as I suggested.Next time I'll ignore you when you ask a question. Quote Link to comment Share on other sites More sharing options...
Kevin Weddle Posted November 18, 2010 Author Report Share Posted November 18, 2010 I did a Wikipedia search for impedance matching transformers. Still, it is about impedance matching. I was refering to transformers used in the IF frequency ranges of audio and video. Quote Link to comment Share on other sites More sharing options...
audioguru Posted November 18, 2010 Report Share Posted November 18, 2010 IF transformers are old and are not used anymore. Higher performance and lower cost crystal filters and SAW (surface-acoustic-wave) filters are used for the past few years. Quote Link to comment Share on other sites More sharing options...
Hero999 Posted November 18, 2010 Report Share Posted November 18, 2010 Kevin,Here are the articles I'm talking about. It doesn't matter whether it's RF or audio.http://en.wikipedia.org/wiki/Impedance_matchinghttp://en.wikipedia.org/wiki/BalunPay attention to the formula. If you can't figure out whether an impedance matching transformer changes the voltage or not then you need to retake basic high school level maths. Quote Link to comment Share on other sites More sharing options...
Kevin Weddle Posted November 18, 2010 Author Report Share Posted November 18, 2010 I have read the explaination for impedance matching and transformers. In what kinds of circuits are they used, and why use a transformer? Quote Link to comment Share on other sites More sharing options...
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