Measurement of Cmos Parasitic capacitors

Thread Starter

pooya estakhri

Joined Nov 3, 2017
3
Hi i had another problem with another question of this circuit (https://forum.allaboutcircuits.com/threads/common-mode-and-differential-mode-gain-of-this-diff-amp-inverter.155590/)

The question asks if we assume that capacitance of capacitors with w/l of 1u/0.5 are
Screen Shot 2019-01-05 at 12.58.45 PM.png

then what are capacitance of capacitors (with the actual w/l)

now i know cgs in saturation for example is cgs0+2/3Cox(w)(L) but wouldn't Cgs0 change with new size ? if so how much ? and what about csb ? isnt it zero ? also in other questions i've seen asking capacitance of Cgb or Cgd too what about measuring them ?
 
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