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Internal Impedance of RF power source?

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Astrid

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Hello,
how to calculate the internal source impedance HF AC signal in the picture?
Q1 IXFH12N50 is drive approximately sin 12MHz, L1 is 9uH IronPowder core with 1mm Cu wire , C1 is low ESR , C2 is polyprophylene.
Qusestion is what is impedance behind C2?


AC power source.jpg
 

The output impedance will depend on the FET bias point and if class C or E operation is involved (discontinuous FET current) also strongly on the RF level.
 

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