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The "offset" is there because a class A amplifier circuit needs a bias current. Respectively the circuit has an output DC bias of Id*Rs.My problem is there seems to be a DC offset of 1.15 volt. Why is that happening.
Did you notice that the example refers to specific transistor parameters Vtn, Kn and \( \lambda \). MBreakN uses quite different default MOSFET parameters. If you set the NMOS model parameters respectively, you can expect similar behavior. Read PSpice manual about MOSFET model parameters.And peak to peak it is 0.5 mV when it should be theoretical 0.884 mV because the voltage gain is 0.884 and the input I am using is 1mV.
The answer in Neamen Ex. 4.7 is 0.884 and I calculated it to be 0.882. But I don't think it should be 0.5 mV