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Multiple-Terminal NPN Transistor Element Handling in ASTAP

IP.com Disclosure Number: IPCOM000043303D
Original Publication Date: 1984-Aug-01
Included in the Prior Art Database: 2005-Feb-04
Document File: 1 page(s) / 12K

Publishing Venue

IBM

Related People

Hsieh, HY: AUTHOR [+2]

Abstract

The ASTAP (Advanced Statistical Transient Analysis Program) network analysis program was originally intended to accept and process only two-terminal network elements, i.e., resistors, inductors, capacitors, etc. Multi-terminal elements, such as transistors, etc., required conversion to a sub-network or equivalent model made up of many two- terminal network elements. An NPN transistor sub-network, for example, included 17 two-terminal network elements for ASTAP program processing, thereby requiring much additional processing by the ASTAP input phase accompanied by a loss of individual transistor identities and dynamic network behavior characteristics. A Modular Device Model (MDM) approach is here disclosed which has led to the improvement of ASTAP capability in dealing with multi- terminal network elements.

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Multiple-Terminal NPN Transistor Element Handling in ASTAP

The ASTAP (Advanced Statistical Transient Analysis Program) network analysis program was originally intended to accept and process only two-terminal network elements, i.e., resistors, inductors, capacitors, etc. Multi-terminal elements, such as transistors, etc., required conversion to a sub-network or equivalent model made up of many two- terminal network elements. An NPN transistor sub-network, for example, included 17 two-terminal network elements for ASTAP program processing, thereby requiring much additional processing by the ASTAP input phase accompanied by a loss of individual transistor identities and dynamic network behavior characteristics. A Modular Device Model (MDM) approach is here disclosed which has led to the improvement of ASTAP capability in dealing with multi- terminal network elements. The NPN transistor, a four-terminal device, is replaced by three non-linear dependent current sources, for which three equations may be inserted in the ASTAP equation. No approximation is necessary in these equations since they are representing identical behavior, mathematically, as an NPN transistor model. With this approach, ASTAP input phase routines are modified such that the ASTAP program can accept and process an NPN transistor without the regular NPN transistor model. A new keyword (MACRO) is recognized in the MDM approach on both model reference and model definition statements. When the keyword ...