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Thread: what is device modelling?


Permlink Replies: 1 - Pages: 1 - Last Post: Jun 16, 2010 10:26 AM Last Post By: bharatindana
guruja

Posts: 1
Registered: 04/15/10
what is device modelling?
Posted: Apr 15, 2010 3:11 PM
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What is the need of Device modelling?Example:ebber moll model.
What impact does it have on Analog design?
bharatindana

Posts: 2
Registered: 12/14/09
Re: what is device modelling?
Posted: Jun 16, 2010 10:26 AM   in response to: guruja in response to: guruja
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In an analog circuit simulation to calculate the voltage/current at any node, simulator requires information about electrical characteristics of each device.
This is provided in the form of a set of equations and parameters to the simulator.
set of equations used to describe the device characteristics is called model eg: BSIM3
parameters are the variables input to these equations so that the device characteristics from simulation are same as observed in actual measurement for a particular device.
eg., of parameters: threshold voltage, mobility.
Determining these parameters for a particular device to match simulation and measurement is called parameter extraction.
I have a mos fabraicated in silicon. I have some measured data for particular vgs and vds.
I use the measurement data and model and extract parameters so that the simulated result is same as measured data.
Then using this model I can simulate the device for any vgs and vds and know the output current.
This is the need of device modeling.
Proper model implies it reflects the fabrication technology exactly.

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