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npn_344 help

The ICCAP Instructions contain the basic procedures for making measurements and performing modeling. This screen is intended to point out things unique to using the npn_344.mdl model file.

Device Selection

You should measure one of the square emitter BJTs. The third BJT from the left on the bottom row is recommended. Normally, you will be required to measure 3 such BJTs from different device cells.

Probe Assignments

SMU1/probe1/CM(H)---->Base
SMU2/probe2---->Collector
SMU3/probe3---->Emitter
SMU4/probe4 is not used.

Note: CM(L) will have to be moved between the Collector(probe2) and Emitter(probe3) as needed to complete the measurements.

Variables and Parameters

Entries under the following locations should be made or verified before performing any extractions, simulations, or optimizations.

Parameter Set | Edit.
- None to edit here, but look at them anyway.
Model | Edit Variables.
- emitter_l - Use LASI to measure.
- emitter_w - Use LASI to measure.
- Device_Cell_#
Edit for each DUT name.
- You may leave the area entered already alone for now.

Related Models

linked_models/bjt_npn.mdl: Sample Plots can be found by loading linked_models/bjt_npn.mdl using MODEL | Read Model . This model was bundled with ICCAP and contains setups which require instruments we do not have in the lab (yet). The plots with the same names should show basically what you should expect your plots to look like (although the scales may be much different). I hope curiosity will get you to explore the components which have been stripped out of the ECE 344 version, however.
Before submitting your my_models.mdl file delete the "npn" model it added and resave.
diodes_344: This model tests the two diodes within the BJTs. It has no modeling incorporated into it. It's intended to gather data over greater bias ranges than the main model and allow you to input calculations and create plots in order to answer some of the questions for the report. It will be most efficient if you make the measurements for this model while you have a BJT measured. Make copies with the same naming scheme (diodes_1, diodes_2, and diodes_3) test your devices.

Manual Excerpts

The npn_344.mdl model file is based on a model file included with ICCAP. Excerpts from their manuals have been scanned in for viewing by uiuc.edu machines (or soon will be).

ECE 344 home page.

This screen was created by Mike Fitzsimmons - U of Illinois ECE Dept. - mikef@uiuc.edu

E-mail comments and suggestions to ece344@uiuc.edu or use the FEEDBACK FORM.

I like to edit this file with the command:

vuepad /ece344/Software/ICCAP/npn_344.help.html &

Warning! This is the archived 1999 Fabweb site! Here is the latest site