Please see my attached file. In the picture is a figure about the relation between Vin and Vout when Vin varies from 0 to VDD.
As in the file, if Vin < Vth1, M1 is in cut off and M2 is in deep triode.
Here is my reasoning:
Call Ids1, Ids2 is the currents through M1 and M2.
If Vin < Vth1, M1 is in cut off and Ids1= Ids2 =0.
But when Ids2=0 then M2 must be in cut off not deep triode. This isn't consistent with the solution above?
Could you tell me where I am wrong here?
As in the file, if Vin < Vth1, M1 is in cut off and M2 is in deep triode.
Here is my reasoning:
Call Ids1, Ids2 is the currents through M1 and M2.
If Vin < Vth1, M1 is in cut off and Ids1= Ids2 =0.
But when Ids2=0 then M2 must be in cut off not deep triode. This isn't consistent with the solution above?
Could you tell me where I am wrong here?
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