simetrix用户手册最新版本2023_SIMetrix教程

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2.3. What is SIMPLIS?

The core algorithms employed by the SIMetrix analog simulator are based on the SPICE program

developed by the CAD/IC group at the department of Electrical Engineering and Computer Sciences,

University of California at Berkeley. The digital event driven simulator is derived from XSPICE developed

by the Computer Science and Information Technology Laboratory, Georgia Tech. Research Institute,

Georgia Institute of Technology.

Although originally derived from these programs only a tiny fraction of the overall application code can be

traced to them. Nearly all of the simulator code is either new or has been rewritten in order to provide new

analysis features and to resolve convergence problems.

Features

• Closely coupled direct matrix analog and event driven digital simulator.

• Fully integrated hierarchical schematic editor, simulator and graphical post-processor.

• Superior convergence for both DC and transient analyses.

• Advanced swept analyses for AC, DC, Noise and transfer function. 6 different modes available.

• Real time noise analysis allowing noise simulation of oscillators and sampled data systems.

• Support for IC design models such as BSIM3/4, VBIC and Hicum.

• Cross probing of voltage, current and device power from schematic. Current and power available for

sub-circuits.

• Monte Carlo analysis including comprehensive tolerance speciﬁcation features.

• Full featured scripting language allowing customised waveform analysis and automated simulation

• Verilog-A Analog Hardware Description Language

• Mixed signal simulation using Verilog-HDL

• Functional modelling with arbitrary non-linear source and arbitrary linear s-domain transfer

function.

• Arbitrary logic block for deﬁnition of any digital device using descriptive language. Supports

synchronous, asynchronous and combinational logic as well as ROMS and RAMs.

• Models for saturable magnetic parts including support for air-gaps.

• User deﬁnable ﬁxed and popup menus and key deﬁnitions.

2.3 What is SIMPLIS?

SIMPLIS is a circuit simulator designed for rapid modelling of switching power systems. An acronym for

“SIMulation for Piecewise LInear System”, it is supplied with our SIMetrix/SIMPLIS product range.

SIMPLIS is a component level simulator like SPICE but is typically 10 to 50 times faster when simulating

switching circuits. It achieves its speed by modelling devices using a series of straight-line segments rather

than solving non-linear equations as SPICE does. By modelling devices in this way, SIMPLIS can

characterise a complete system as a cyclical sequence of linear circuit topologies. This is an accurate

representation of a typical switching power system where the semiconductor devices function as switches.

However, a linear system can be solved very much more rapidly than the non-linear systems that SPICE

handles. The end result is accurate, but extremely fast simulations, allowing the modelling of complex

topologies that would not be viable with SPICE.

SIMPLIS has three analysis modes: Transient, Periodic Operating Point and AC. Transient analysis is

similar to the SPICE equivalent but is typically 10-50 times faster. Periodic Operating Point is a unique

analysis mode that ﬁnds the steady-state operating waveforms of switching systems. AC analysis ﬁnds the

frequency response of a switching system without needing to use averaged models. This is especially

SIMetrix/SIMPLIS User’s Manual

2.4. Why Simulate?

useful for what-if studies on new circuit topologies or control schemes where the small-signal averaged

model has not yet been derived.

Because non-linear devices are deﬁned using a sequence of straight line segments, models for such devices

are quite different from SPICE models. There are of course many SPICE models available and so in order

to retain compatibility with these, SIMetrix/SIMPLIS has the ability to convert models for some types of

device into SIMPLIS format. This conversion is performed when the device is placed on the schematic.

Devices currently supported are MOSFETs, BJTs and diodes. In the case of MOSFETs and Zener diodes,

the conversion is achieved by performing a sequence of simulations using the SIMetrix-SPICE simulator.

This method is independent of the method of implementation of the device.

2.4 Why Simulate?

Integrated circuit designers have been using analog simulation software for nearly ﬁve decades. The

difﬁculty of bread-boarding and high production engineering costs have made the use of such software

essential.

For board level designers the case has not been so clear cut. For them prototyping is straightforward,

inexpensive and generally provides an accurate assessment of how the ﬁnal production version of a circuit

will behave. By contrast computer simulation has been seen as slow and prone to inaccuracies stemming

from imperfect models.

In recent years, however, the simulation of discrete analog circuits has become more viable. This has come

about because of advances in CPU power, the increased availability of device models from their

manufacturers and the introduction of easy to use and affordable simulation tools such as SIMetrix.

The pressure to reduce product development time-scales has meant that for many projects the traditional

bread-boarding phase is skipped altogether - with or without simulation - and circuit development is

carried out on the ﬁrst revisions of PCB. The use of simulation on a circuit or parts of a circuit can help to

eliminate errors in a circuit design prior to this stage and reduce the number of PCB revisions required

before the ﬁnal production version is reached. Of course, to be useful, the simulation process must

therefore not be too time consuming.

Computer simulation, does however, have many more uses. There are some things you can do with a

simulator which cannot be achieved with practical approaches. You can remove parasitic elements, you

can make non-invasive measurements that are impossible in real-life or you can run components outside of

their safe operating area. These abilities make simulation a valuable tool for ﬁnding out why a particular

design does not behave as expected. If the problem can be reproduced on a simulator then its cause can be

much more easily identiﬁed. Even if a problem cannot be reproduced then this gives some clues. It means

that it is caused by something that is not modelled, a wiring parasitic perhaps.

Simulation is extremely useful for testing ideas at the system level. Sometimes it is not easy to test a

concept because the hardware to implement it is very costly or time consuming to build. It may even be

that you don’t know how to implement the idea in hardware at all. The alternative is to design a model and

simulate it with a computer. Once it has been established that the concept is viable then attention can be

given to its implementation. If it proves not to be viable, then a great deal of time will have been saved.

2.5 System Requirements

2.5.1 Operating System

SIMetrix and SIMetrix/SIMPLIS 64 bit version

The following are supported:

Windows 10 Home, Pro and Enterprise - 64 bit editions

SIMetrix/SIMPLIS User’s Manual

2.6. Acknowledgements

Windows 8.1, Windows 8.1 Pro, Windows 8.1 Enterprise - 64 bit editions

Windows 8, Windows 8 Pro, Windows 8 Enterprise - 64 bit editions

Windows 7 Home Premium/Professional/Enterprise/Ultimate - 64 bit editions

SIMetrix and SIMetrix/SIMPLIS 32 bit versions

The following is supported

Windows 7 Home Premium/Professional/Enterprise/Ultimate

Windows RT

SIMetrix and SIMetrix/SIMPLIS will not run on any version of Windows RT.

2.5.2 Hardware

SIMetrix will run satisfactorily on any system that meets all the following requirements:

1. The system is running one of supported operating systems listed above

2. The system meets the minimum hardware requirement for the operating system

3. The system’s display has a minimum vertical resolution of 720 pixels and a minimum horizontal

resolution of 1024 pixels

2.5.3 Recommended System

If you regularly run large circuit simulations or long runs on smaller circuits, we recommend investing in

the most powerful CPU available. A large RAM system can be useful as this will allow caching of

simulation data. This will speed up plotting results if a large amount of data is generated. The data is

stored to disk in an efﬁcient manner and therefore substantial RAM is not essential unless the circuits

being simulated are very large indeed. A high performance bus mastering SCSI disk system will improve

simulation performance a little.

2.5.4 Multi-core Processors

SIMetrix can exploit multiple core CPUs in a number of ways and will beneﬁt from multiple core

processors. Note, however, that you will require a SIMetrix Pro or SIMetrix Elite license to be able to use

the multiple core features. Note also that SIMetrix cannot effectively use Hyper-threading.

For more information, see the following sections:

“Simulation and Multi-core Processors” on page 223

“Using Multiple Cores for Multi-step Analyses” on page 261

“Multi-core Multi-step SIMPLIS Analyses” on page 279

2.6 Acknowledgements

We acknowledge the following code sources and copyright owners:

1. SPICE3, BSIM3 and BSIM4: The Regents of the University of California at Berkeley

SIMetrix/SIMPLIS User’s Manual

Chapter 3

Quick Start

3.1 Introduction

This chapter covers a number of tutorials that will help you get started with SIMetrix.

Tutorial 1 is designed for total novices. You may wish to skip to tutorial 2 if you already have experience

with SPICE type programs.

Tutorial 2 assumes you have grasped the basics of using the schematic editor. You don’t have to worry

about setting up analyses or the characteristics of any input stimulus such as V2 in tutorial 1; these

procedures will be explained.

If you are an experienced circuit designer but have never used a circuit simulator before, we recommend

you read “Simulation for the Novice” on page 7. This will familiarise you with a few concepts about

simulation that may be alien to you if you are used to traditional methods of evaluating circuits.

3.1.1 Examples and Tutorials - Where are They?

On Windows the example ﬁles are ﬁrst installed under the main installation root (e.g. under C:\Program

Files\SIMetrix820\support\examples) but it is not intended that they are used from that location. Instead

they will be copied to your “My Documents” folder when SIMetrix starts for the ﬁrst time, but only if you

accept the option to do so. If you can’t ﬁnd the examples ﬁles, you may need to manually copy them from

the installation root to a suitable location of your choice.

In the following tutorial discussions, the examples directory is referred to as ‘EXAMPLES’.

3.1.2 Simulation for the Novice

When measuring a real circuit, you would probably connect up a power source - bench power supply

perhaps - maybe also some signal source, then switch it on and take measurements using - probably - an

oscilloscope. You can also make adjustments to the circuit and see the effects straight away.

For simulation, you have a choice of analysis modes and not all of them have an exact real life equivalent.

The analysis mode that most closely resembles the method of bench testing a circuit described above is

transient analysis. This performs an analysis over a speciﬁed (by you) time period and saves all the results

- i.e. all the voltages and currents in the circuit - to your hard disk. The difference between real life testing

and simulation is that the simulation is not running all the time. If you want to see the effects of changing a

part value, you have to change it then re-run the simulation. (But note there is a potentiometer device that

automates this procedure see “Potentiometer” on page 161).

SIMetrix/SIMPLIS User’s Manual

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