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 and level 200 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 SiMKit C-code for Juncap level 200 has been automatically generated from a Verilog-A description of the model. The functionality of this SiMKit C-code is the same as that of the Verilog-A. The Verilog-A code of Juncap level 200 can be downloaded from the ASU/NXP PSP website.

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.