Broadband VHF/UHF Amplifier Design Using Coaxial Transformers

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bubuta77

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Transmission line transformers are a good tool to design broadband matching in PAs. If you don't need the broadband feature, you'll come along with standard LC impedance matching more easily. You'll find a lot of similar designs at www.polyfet.com

A transmission line transformer simulation must reflect the common mode impedance, usually by additional transmission line elements. In a transmission line transformer with core, the common mode impedance is increased compared to a coreless design, in the shown circuit, the common mode transmission line is omitted because the core inductance dominates the common mode impedance.
 

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