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.

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.