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[SOLVED] How the capacitance varies as input power varies in a mmW RFIC PA?

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Fávero Santos

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Hello, all

I read that the input capacitance in a cascode cell varies as input power varies in a mmW RFIC.

Could anyone explain me how this happens? Is it an effect of the Miller effect?

Many thanks!
 

Almost all intrinsic capacitors in a semiconductor device behave like varicap diodes.So reverse polarized but bias and signal amplitude dependent.
Hence, it shouldn't be a surprise capacitor value is amplitude dependent if the amplitude is sufficiently high.
 
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