Discussion
Why does a diode's junction capacitance matter at radio frequencies?
Answer: C
A few picofarads is a low impedance at hundreds of megahertz, so signal leaks straight through a diode that is supposed to be blocking, which is why switching diodes for radio work are specified for low capacitance. The forward drop, the thermal behaviour and the leakage are all unaffected by it. A parasitic that is negligible at one frequency and dominant at another is the normal situation, and the only question is where the crossover lies.
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