Isn't it possible that cmos transistor amplifier have no power gain if I use S21( which is forward power gain)?

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Aparna Sathya Murthy

As far as I understand , power gain = Po/Pi =0 =>, Po =0 , the only artwork you have is impedance of the device.

Or , borrow the 2-port analysis and S-parameters

Eg: of LNA - http://waset.org/publications/4556/noise-optimization-techniques-for-1v-1ghz-cmos-low-noise-amplifiers-design-

Z. Skvor

Well ... it is always possible to desing an amplifier that does not amplify at all. Cam you be more specific?

Fatemeh Jafari Naeeni

maybe i can help you but need more explanation what you want exactly!