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I agree with the statements in your first paragraph, I used a poor choice of words. If the output of a common-source amplifier is short-circuited to ac ground and an input test current is applied, the input current is iin = s(Cgs+Cgb+Cgd)*vgs.
The current resulting from sCgd*vgs cannot be...
LvW, thanks for your response though I do not understand what you have written.
To be more clear, I am referring to the derivation by Grey and Meyer in "Analysis and Design of Analog Integrated Circuits 5e", section 1.6.8 MOS Transistor Frequency Response. As repeated here, the input current...
For a MOSFET, while deriving the transit frequency wT (defined as where the current gain is unity), it is common to neglect the current fed forward through Cgd (i.e. the output current io = gm*vgs and not gm*vgs-jw*Cgd).
What is the reason for doing so?
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