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what is device modelling?
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on Apr 15, 2010
on Jun 16, 2010 by bharatindana
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What is the need of Device modelling?Example:ebber moll model.
What impact does it have on Analog design?
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Jun 16, 2010 9:26 AM
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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