Planar N-Type MESFET : Planar N-Type MESFET

Requires: Mercury
Minimum Versions: Atlas 5.22.1.R

This is a basic introduction to the Mercury module. Mercury is optimized for the fast simulation of epitaxial FETs (that is FETs that have a constant epistructure and doping profile from the source to the drain).

This example defines a simple, planar n-type MESFET and simulates the DC-IV curves and the small-signal AC characteristics.

Most of the commands are familiar Atlas commands, however there are a few commands and parameters that are specific to the Mercury module.

The network clear command removes the external circuit that surrounds the FET. As Mercury can do a large-signal harmonic balance simulation on the FET it needs to be able to solve the FET within an external circuit. This circuit is not usually needed when simulating the DC or small-signal behavior.

The models n_depletion command tells Mercury that the device is an n-type depletion mode FET. Mercury can use this information to optimize the simulation.

The poisson command is used to generate a look-up table that characterizes the channel as a function of surface condition.

To load and run this example, select the Load example button in DeckBuild. This will copy the input file and any support files to your current working directory. Select the run button to execute the example.