using a femtofarad capacitor in RF design

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s_ss

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Hello all,

I am designing an RF amplifier and in my design if I use a capacitor of 55fF between two stages, my S21 becomes smooth and wide as I need. The question is...is it ok to use such a small capacitor in RF design because it will be having a very high impedance and may be an open circuit or we shall consider that some small signal will be going?

An early response will be highly appreciated.

Regards
 

Of course this is ok. For the layout you have to consider the parasitics, and probably you'll have to change its value.
 

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