Hi There !
The Last time I worked with this AMS 0.35u process was when at the
uni ... ages ago !
So I don't really know what's the VT value on this PDK but I can give
you a hint to get it yourself without asking anybody but your best
ever companion for this kind of requests : Spectre !
1. A MOS is operating in saturation mode when both of the following
conditions are satisfied :
Cond_1: VGS > VTH
Cond_2: VDS > (VGS-VTH)
That's of course for N-type Fets, just reverse it for the P ones.
2. To get your VTH from Spectre, just run a DC OP on your schematic
and the go to :
Analog Design Environment Window -> Results -> Print -> DC Operating
Point
This menu should be active (not grayed) if you've already done a DC
(with saving OP points) simulation.
So when you hit this 'DC operating Points' menu, Cadence comes with a
blank window called 'Results Display Window'.
This window is empty so far because it's waiting for you to select the
device from the schematic.
If you give a look at the bottom left corner of your current schematic
window, you should see the following message :
Ready> select instances for the MP output ...
You know then what you do ! Just hit that device and you get your
Rsults display window nicely decorated !
You will find there all the outputs you need for your transistor,
including the VTH
This is the simplest way for you to get the VTH
There are other ways to print this value if don't like the GUIs but I
don't recommend it for you.
BTW, among this huge list of output parameters, there is one that
could interests you : "region"
I'm not gonna tell you what it is, just search in the Spectre
do***entation and you will understand why I'm talking about it ...
Enjoy yourself !
Riad.
|
