Isn't it possible that some artwork in cmos distribute amplifier have no power gain if I use S21 in Cadence Spectre? But after that I found that maximum stable power gain (Gmsg) have some power gain which make me very chaos.
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-
Well ... it is always possible to desing an amplifier that does not amplify at all. Cam you be more specific?
maybe i can help you but need more explanation what you want exactly!
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