Introduction to Juncap
The JUNCAP model describes the behavior of the diodes that are formed by the source, drain, or well-to-bulk junctions in MOST devices. In order to include the effects from differences in the sidewall, bottom, and gate-edge-junction profiles, these three contributions are calculated separately in the JUNCAP model.
Model definition of Juncap
The definition of the Juncap model 
Level 1(681kB)
and level 200 (653kB) are available in PDF format.
Juncap, level 1. This model describes
- depletion capacitance,
- ideal diode current
- reverse leakage current due to Shockley-Read-Hall generation
Juncap, level 200. This model is a major update of the JUNCAP level 1 model. It models all the effects already present in level 1, and has many new features:
- depletion capacitance
- ideal diode current
- Shockley-Read-Hall recombination and generation currents (in forward and reverse regimes)
- trap-assisted tunnelling (in forward and reverse regimes)
- band-to-band tunnelling
- avalanche breakdown
- shot noise
The history of the model can be found here.
Source Code & Library
The source code of Juncap is available here.
The files containing the level 1 and level 200 code are "device_juncap.c" and
"device_juncap2.c" respectively. If you use the included solver, please make sure that you compile on a
system that supports Fortran 77.
The source code for Juncap level 200 has been automatically generated from a Verilog-A description of the model.
The history of the source code can be found here.
The models are included in a dynamically loaded library called SiMKit.
SiMKit is related to the following circuit simulators used within NXP:
- Pstar, the circuit simulator from NXP
- Spectre, the circuit simulator from Cadence
- ADS, the circuit simulator from Agilent.
You can read how to download and install the libraries here.
The source code is protected by Copyright © 1991, 2007, NXP.
Additional documentation
Further information on Juncap is available in the following additional documentation:
- Documentation for Level 200: juncap2.pdf file (730kB). Last update August 2005.
Related Publications
There are no related publications on Juncap.