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TECHNIQUE FOR COMPUTING NON-LINEAR DRIVER MODELS FROM PRE-EXISTING INPUT-OUTPUT SIGNAL PAIR MEASUREMENTS USING FINITE ELEMENTS METHOD WITH APPLICATIONS IN COMPUTER AIDED ELECTRICAL CIRCUIT DESIGN

IP.com Disclosure Number: IPCOM000008822D
Original Publication Date: 2002-Jul-16
Included in the Prior Art Database: 2002-Jul-16
Document File: 5 page(s) / 38K

Publishing Venue

Motorola

Related People

Bogdan Tutuianu: INVENTOR [+2]

Abstract

We are proposing a robust technique for computing non-linear driving port models that reproduce very accurately the behavior of logic electrical circuits for a specific signal propagation path between an input and an output port. The non-linear driver model is a simple pair of non-linear current or voltage sources controlled simultaneously by the input and output port signals (current and/or voltage). For a set of known input-output signal pairs, the state equations of the model are algebraically converted using the finite elements method into a system of linear equations whose solution is the parameter set for the non-linear driver sources. Our modeling technique allows the user to control the accuracy and the stability of the models, generates re-usable models, and is entirely based on pre-existing signal measurements. The models can be used primarily in automated circuit simulation and optimization, static timing analysis, and functional and delay noise analysis.

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TECHNIQUE FOR COMPUTING NON-LINEAR DRIVER MODELS FROM PRE-EXISTING INPUT-OUTPUT SIGNAL PAIR MEASUREMENTS USING FINITE ELEMENTS METHOD WITH APPLICATIONS IN COMPUTER AIDED ELECTRICAL CIRCUIT DESIGN

Authors: Bogdan Tutuianu and Ross Baldick

Abstract: We are proposing a robust technique for computing non-linear driving port models that reproduce very accu­rately the behavior of logic electrical circuits for a spe­cific signal propagation path between an input and an output port. The non-linear driver model is a simple pair of non-linear current or voltage sources controlled simultaneously by the input and output port signals (current and/or volt­age). For a set of known input-output signal pairs, the state equations of the model are algebraically converted using the finite elements method into a system of linear equations whose solution is the parameter set for the non-linear driver sources. Our modeling technique allows the user to control the accuracy and the stability of the models, gener­ates re-usable models, and is entirely based on pre-existing signal measurements. The models can be used primarily in automated circuit simulation and optimization, static timing analysis, and functional and delay noise analysis.

1. The non-linear driver modeling technique:

                    The driver model is a non-linear two port model comprised of two non-linear sources. One simple model example is using two voltage controlled current sources, one at the input port and one at the output port (see figure 1). In this document we make our presentation using this type of two-port model, whithout restricting the generality of the modeling technique. The non-linear current sources are controlled simultaneously by the input and output port voltages. The current at the input port (iu) is a function of input port voltage (vu) and output port voltage (vw): iu=iu(vu, vw). The controlled sources are modeled using the finite elements technique, with well defined values for a dis­crete set of input-output voltage pairs. The user has the ability to control the overall model functions using non-linear terms (e.g. (vu)2) and time derivative terms (e.g. dvu/dt).

                    In practice, the accurate signal propagation analysis on large logic circuits for complex input and output conditions (e.g. noisy input signal and complex output pin load) is a time consuming and error-prone process. It is often the case that sig­nal propagation between all the possible input-output pin pairs of the logic circuits have...