Comsol vs ansys install#
Comsol vs ansys generator#
Comsol vs ansys update#

It builds the NEM relay geometry using a SpaceClaim script. There is an unfinished ANSYS 2020 Workbench model. ANSYS model (unfinished, skip this for now) These parameters are used by the Verilog-A model. This generates contpts.json, which is used by layouts/relay.py to generate a new layout using the contact placement.ДЇor SPICE modeling, make sure to run python comsol_postproc.py, which generates spice/tech_params.va. Then, run python contpts.py to get the next set of contacts (modify the parameters internally, if necessary, first). An arbitrary point on any of the contacts should work well.ДЇor iterative contact placement, make sure to run the quasi-static sweep, then choose an operating voltage and displacement contour to extract, then export the displacement contour points. You can export the parameters as well for iterative contact placement and SPICE modeling.ДЇor quasi-static sweep, you will have to choose a point on the relay to compute the displacement for.

Mechanical properties (spring constant, mass, eigenfrequencies).

Contact placement and displacement contour plot.

Mutual capacitances between all terminals.

Once these have been computed, you can view the results:

Transient Sweep: find out pull-in speed.

Quasi-Static Sweep: find pull-in and pull-out voltages, contact forces, displacement contour, etc.

A hacky way to get approximate parasitic extraction in the ON state is to set g_act = t_cont and gaptol = 1nm.

Parasitic Extraction: extract parasitic mutual capacitances between all terminals.

Modal Analysis: determine eigenmodes and shapes.

Spring Constant: determine spring constant by applying force to plate.

The COMSOL model has 5 studies that predict the physics of the multi-pole NEM relay.

Comsol vs ansys update#

NOTE: you may have to slightly modify the parameters once they have been loaded, since COMSOL has a bug where it does not automatically update the relay selections.

Under Global Definitions/Parameters/Contact Placement, clear, load from file and select comsol/contpts.txt.

Under Global Definitions/Parameters/Relay Parameters, clear, load from file and select comsol/params.txt.

To begin, run python comsol_preproc.py to generate params.txt. Step 3: Finite element modeling (FEM) COMSOL model SIDE NOTE: when we wanted to use the layout with Virtuoso, we combined layers in KLayout by doing layer operations: layer 6 = layer 6 - layer 7 + layer 8. This will use the params specified in params.json to calculate and print these numbers. You can also get predictions of the pull-in/pull-out voltages and parasitic capacitances based on the parallel-plate model by running python handcalcs.py. It will also generate comsol/contpts.txt which can be loaded into COMSOL in the next step. Running cd layouts python relay.py will generate layouts in DXF, GDSII, and CIF format based on the parameters in params.json.

Comsol vs ansys install#

You can also install the KLayout GUI ( ), which may help with layout visualization. Please use pip install klayout to install the Python API for KLayout.

Comsol vs ansys generator#

Step 2: KLayout NEM relay layout generator To initialize contact placement to a circle, this file can be deleted. contpts.json controls the locations of the contacts. Descriptions of the parameters are in helper/params_desc.json. The configuration file params.json controls the relay dimensions and model parameters. This repository contains almost everything a researcher might need to get started with NEM relays (MEM relays): (1) a parametric layout generator with KLayout, (2) finite elment models (FEM) with COMSOL/ANSYS, (3) static/dynamic compact model generators with SPICE/Verilog-A (and validation in Mathematica), (4) scripts for characterization with Synopsys SiliconSmart to produce Liberty files for VLSI flows.ДЄ video tutorial of the COMSOL model is available: