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Subject: Common Source Amplifier

Date: 08/30/03 at 12:39 PM
Posted by: Jason
E-mail: jason_class[AT55]yahoo.com (replace [AT55] with @ to reply)
Message Posted:

Hello Russ,

Thank you for your consistent help.
Kindly see the CSA on page
http://www.geocities.com/jason_class/CSA.gif

I would like to ask you about common source amplifier's equavalent small signal model.
May I know why we need only Cgd and Cgs for the capacitance in CSA's small signal model? What about Csb, Cdb and Cgd? Why is it so?

Then for common drain and common gate will also consider only Cgd and Cgs?

Kindly enlighthen me.
Thank you Russ

best regards and thanks
Jason


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