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SPICE Simulation Models

Contents

Overview

The National Instruments SPICE Simulation Fundamentals series is your free resource on the internet for learning about circuit simulation. The series is a set of tutorials and information on SPICE simulation, OrCAD pSPICE compatibility, SPICE modeling, and other concepts in circuit simulation.

For more information, see the SPICE Simulation Fundamentals main page.

The series is divided among a number of in-depth detailed articles that will give you HOWTO information on the important concepts and details of SPICE simulation.

Circuit simulation is an important part of any design process. By simulating your circuits, you can detect errors early in the process, and avoid costly and time consuming prototype reworking. You can also easily swap components to evaluate designs with varying bills of materials (BOMs).

An important key to performing accurate and successful SPICE simulation is to use high quality SPICE models. While most circuit simulation packages such as Multisim come with thousands of components and SPICE simulation models, frequently designers need to use a part that does not exist in the available database. When these situations arise, the software tool will typically have a way of adding custom components and models to the database. Multisim for example has a detailed component creation wizard that will guide designers through the process of defining custom parts for simulation and PCB layout (See Creating Custom Components in Multisim).

 

What is a SPICE Simulation Model?

A SPICE model is a text-description of a circuit component used by the SPICE Simulator to mathematically predict the behavior of that part under varying conditions. SPICE models range from the simplest one line descriptions of a passive component such as a resistor, to extremely complex sub-circuits that can be hundreds of lines long.

SPICE models should not be confused with pSPICE models. pSPICE is a proprietary circuit simulator provided by OrCAD. While some pSPICE models are compatible with SPICE, there is no guarantee. SPICE is the most widely used circuit simulator, and is an open standard.

 

Model Makers

Some SPICE simulation programs such as Multisim include model makers to automatically generate SPICE models for various components. Multisim version 10.1 has 24 SPICE Model makers.

 

Where to look for SPICE Simulation models

The best place to look for SPICE models is to browse the vendor or manufacturer’s website. Listed below are some of the most popular chip vendors that supply SPICE models on their website.

Vendor

 Description

Analog Devices

Amplifiers and Comparators, Analog to Digital Converters, Digital to Analog Converters, Embedded Processing & DSP, MEMS and Sensors, RF/IF Components, Switches/Multiplexers, Analog Microcontrollers, Interface, Power and Thermal Management

Apex Microtechnology

Linear Amplifiers, PWM Amplifiers

Christophe Basso

Switch-mode power supplies

Coilcraft, Inc.

Power Magnetics, RF Inductors, EMI / RFI Filters, Broadband Magnetics

Duncan Amps

Amplifiers, Vacuum tubes

Infineon Technologies AG

Fiber Optics, Microcontrollers, Power Semiconductors, Small Signal Discretes

Kemet Home Page

Surface-mount capacitors in aluminum, ceramic and tantalum and leaded capacitors in ceramic and tantalum

Maxim

Amplifiers and Comparators, Analog Switches and Multiplexers, Clocks, Counters, Delay Lines, Oscillators, RTCs, Data Converters, Sample-and-Holds, Digital Potentiometers, Fiber and Communications, Filters (Analog), High-Frequency ASICs, Hot-Swap and Power Switching, Interface and Interconnect, Memories: Volatile, NV, Multi-Function, Thermal Management, Sensors, Sensor Conditioners, Voltage References, Wireless, RF, and Cable

ON Semiconductor

Power Management, Amplifiers, Comparators, Analog Switches, Thyristors, Diodes, Rectifiers, Bipolar Transistors, FETs, Standard Logic, Differential Logic,

Polyfet

Polyfet transistors

STMicroelectronics

Amplifiers & Linear,Analog & Mixed Signal ICs, Diodes, EMI Filtering & Conditioning, Logic, Signal Switch, Memories, Microcontrollers, Power Management, Protection Devices, Sensors, Smartcard ICs, Thyristors & AC Switches, Transistors

Texas Instruments

Buffers, Drivers and Transceivers, Flip-Flops, Latches and Registers, Gates, Counters, Decoders/Encoders/Multiplexers, Digital Comparators

Tyco Electronics (formerly Amp)

Electromechanical components, passive components, power sources, RF & Microwave products

Vishay

Manufacturer of analog switches, capacitors, diodes, inductors, integrated modules, power ICs, LEDs, power MOSFETs, resistors and thermistors.