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Subject: Re: vgs1 and vgs2

Date: 09/28/03 at 5:45 PM
Posted by: mike
E-mail: mcjh2[AT55]austin.rr.com (replace [AT55] with @ to reply)
Message Posted:

In Reply to: Re: vgs1 and vgs2 posted by Jason on 09/27/03 at 2:44 AM:

Hi Jason,

Doesn't Ids1 = Ids2 = I1 have to be true? Where else can I1 current go? All gate currents are very small so assume they are zero for now.

Consider a graph of Ids v Vds for different Vgs for a MOSFET and assume Q1 and Q2 are operating in saturation. Its not really a big assumption. It just requires enough supply voltage. Then Vgs1 = Vgs2 because Q1 = Q2 and Ids1 = Ids2.

Now assume Q1 and Q2 are operating in the triode region. Vgs1 = Vgs2 for the same reason.

mike


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