Mosfet model selection for simulation

Thread Starter

valorous

Joined Oct 28, 2021
18
I want to do the frequency response of the MOSFET-based amplifier. So I need Vo/Vi in output to plot the freq response, so to find the gain of the amplifier.
The first problem is: Which model of mosfet to choose in ltspice: nmos or nmos4 ???
Now, when I select nmos4 and set the parameter (Vto=3 , Kp=0.4m, lambda=0 , as given by the instructor) , I m getting a straight line as output (see the first attachment)
Now when i select 'nmos' and ''pick the new mosfet'' from the list and select Si7336ADP and set the above parameters , still i m getting the same output .
Tell me why this is happening and which model should i choose to get the perfect freq response of the amplifier

1645334949302.png1645334949302.png same for both cases ,
 

Alec_t

Joined Sep 17, 2013
13,153
select Si7336ADP and set the above parameters , still i m getting the same output .
Sounds like you're editing the model and over-riding its provided parameters? If they're then the same values as your instructor gave it's no surprise you get the same result.
 
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