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High frequency response of cascode amplifier

A

abbie

Jan 1, 1970
0
In the book of "Microelectronic Circuits, S&S 4th edition" page 624,
anyone could explain to me how the Source Absorption Theorem being
applied? How come the current source gm2Vn2 can be a resistance
(1/gm2) but the voltage between E2 and C2 is not Vn2?
 
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