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MIX-MODEL SIMULATION

IP.com Disclosure Number: IPCOM000006973D
Original Publication Date: 1993-Jun-01
Included in the Prior Art Database: 2002-Feb-13
Document File: 2 page(s) / 101K

Publishing Venue

Motorola

Related People

Mark Rencher: AUTHOR [+4]

Abstract

In simulating integrated circuits the process of defm- ing models to represent component behavior is required. Depending on the models available within a simulator, the integrated circuit being designed and the phase of the design cycle, a merent set of models will be required. For example, during the design of an analog integrated circuit the first simulation phase is to establish or obtain the functional requirements. This requires a "quick and dirty" less accurate simulation model. The goal is to achieve functionality as soon as possible. Once the &mc- tionally has been achieved, parametric considerations then need to be met, thus a more complex and more accurate model.

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0 M MO-LA

INC. Technical Developments Volume 19 June 1993

MIX-MODEL SIMULATION

by Mark Rencher, Rick Hester, Leo Kasel and Bob Burns

INTRODUCTION

  In simulating integrated circuits the process of defm- ing models to represent component behavior is required. Depending on the models available within a simulator, the integrated circuit being designed and the phase of the design cycle, a merent set of models will be required. For example, during the design of an analog integrated circuit the first simulation phase is to establish or obtain the functional requirements. This requires a "quick and dirty" less accurate simulation model. The goal is to achieve functionality as soon as possible. Once the &mc- tionally has been achieved, parametric considerations then need to be met, thus a more complex and more accurate model.

  This report discusses the purpose in providing a mix- model simulation environment, description of model complexities and a method to provide the "switching" between model complexities to reduce design cycle time.

PURPOSE

  To develop a multiple model simulation environ- ment that accommodates accuracy during design phases (functional, parametric) and provide a switching mech- anism for various model complexities for an integrated circuit simulation environment.

  The standard method for modeling IC element elec- trical characteristics is through identifying a simulation model and providing the parameters required for the model. The level of accuracy achieved by the simulator is directly related to the accuracy of the model.

DESCRIPTION OF MODEL COMPLEXlTlES

  Currently many models contained within simula- tors do not accurately model the electrical characteris- tics of the IC element. To improve the accuracy added components are included. By including these added com- ponents complexity is introduced. By adding complex- ity simulation times and design cycle time increase.

  To achieve a balance between design cycle time and accuracy, a method is developed that provides a mecha- nism to identify various complexity levels and provide a way to "sw...