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I ave got a question similar to above questio. I have read in book "Design of analog integrated CMOS integrated circuits" by Behzad Razavi that in order to work PMOS transistor as a switch in triode region, the following conditions must be true.
|Vgs|> |Vth|
|Vds|< |Vgs-Vth|
and Vd-Vg< |Vth|
I am not able to understand the last condition.. Can some body explain please..
The first 2 conditions are enough. The third one can be derived from the 2nd one. For example, in NMOS FET, the 2nd condition is
Vd - Vs < Vg - Vs - Vth => Vd - Vg < -Vth.
I don't know which page you got your equation from in the book. But you got the idea.
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