Every software package contains a full set of examples suitable for that version and are installed with the software. If you see examples here that are not in your installation you should consider updating to a later version of the software. These examples can be used by beginners and advanced users for product evaluation, teaching purposes, and self-training.
Required Modules
Victory Process
- 2D Diffusion & Implantation
Victory Mesh
- 3D Meshing
- 3D Solid Modeling
Victory Device
- 3D Simulator
- 3D Single Event Effects
- 3D MixedMode
The TCAD structure is struck with a 1 LET single event when it is in its low power configuration with an applied supply voltage of 0.85 volts, which represents the state of highest sensitivity to being upset by a single event.
The data flow in this example occurs in the following sequence:
The calibrated 65nm nMOS TCAD structure
The 65nm nMOS TCAD structure is biased into its high sensitivity, low power off state, with Vd=0.85 Volts and Vs,Vg=0 Volts. This TCAD structure, in this biased state, is then saved.
A new device simulation, this time in MixedMode3D, which contains the rest of the SRAM circuit, is then specified, and the previously saved biased TCAD structure is loaded, and its biased condition initializes the circuit state. The line which loads the TCAD structure initial state is: .OPTIONS loadsolutions
After the MixedMode3D simulation is complete, the solutions are plotted at the end.
The energy of the Single Event Strike is characterized by a parameter called the “Linear Energy Transfer» or LET. The higher the LET, the greater the energy of the incoming particle or photon. In this example, the LET value of the incoming strike is set up as a variable, by the line “set LET=1 “, which creates a variable called “$LET ” and assigns it a unity value. In order to convert the units of LET into units of pico Coulombs/um of track charge density, the LET value needs to be multiplied by 0.01035 for silicon material. A second variable called “$density ” is assigned this converted pico coulomb value. Lastly, the units of the strike are specified to be these same pico coulomb units, by the parameter “pcunits ” in the “singleeventupset ” statement that describes the time and track positional properties of the strike.
Images
