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process parmeters from where???

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NaumanAhmed

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tsmc018 velocity saturation

In practical CMOS analog ic design from where does a designer get the values differnt process parameters like µ, Cox, VTH λ, vsat(saturation velocity)..... that are used for hand calculations.
 

or spice model file
 

Design manuals and/or your own DC simulations.
Click to expand...

does the foundry provides thoes deign manuals and from where we can freely get thoes MOSIS or.......?? If i want to extract them my self how it can be done??
Is it something like curve fitting on the simulated Id-Vds and Id-Vgs curves may be using curve fitting toolbox of MATLAB????. I just want to confirm

Added after 34 minutes:

or spice model file
Click to expand...

some one told me that in today's complex and accurate spice models like bsim3
VTH=... does not mean the simple VTH that we use in hand calculations using simple device equations. Same is the case for other parameters
 

The design manuals should come along with your PDK.
If you like you could do some curve fitting type of model but a rough estimate of those parameters is enough for hand calculations. The simulator will do the rest: what you need to understand is how those parameters affect your design!
 

Thanks for your help

The simulator will do the rest: what you need to understand is how those parameters affect your design!
Click to expand...

could you please elaborate this point
 


The foundary provides experimentally obtained data for the technologies they support. So if you are going to use a MOSIS supported process say AMI then you will get all these parameters from their website. For instance this is for a TSMC process
https://www.mosis.com/cgi-bin/cgiwrap/umosis/swp/params/tsmc-018/t44e_mm_non_epi_thk-params.txt
Click to expand...

I have visted the above link are you talking about transistor parmeters. Can we use these parameters for hand calculations. These are something like:

TRANSISTOR PARAMETERS W/L N-CHANNEL P-CHANNEL UNITS

MINIMUM 0.27/0.18
Vth 0.51 -0.53 volts

SHORT 20.0/0.18
Idss 580 -269 uA/um
Vth 0.52 -0.54 volts
Vpt 4.6 -5.4 volts

WIDE 20.0/0.18
Ids0 19.2 -4.9 pA/um

LARGE 50/50
Vth 0.43 -0.42 volts
Vjbkd 3.1 -4.1 volts
Ijlk <50.0 <50.0 pA

K' (Uo*Cox/2) 168.5 -35.8 uA/V^2
Low-field Mobility 400.14 85.01 cm^2/V*s
.......
.......
Click to expand...
 

NaumanAhmed said:
In practical CMOS analog ic design from where does a designer get the values differnt process parameters like µ, Cox, VTH λ, vsat(saturation velocity)..... that are used for hand calculations.
Click to expand...

have a look at MOSIS.org
 

Check the spice model that they give in the same page ....you can use that........if you have any doubts regarding the units and all....you can always refer to some textbooks that explaing this like kang or razavi.
 

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