Personal Simulation Program with Integrated Circuit Emphasis

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P

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S

imulation

P

rogram with

I

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C

ircuit

E

mphasis

PSPICE

From SPICE to PSPICE

SPICE:

Engineering design tool for circuit simulation

SPICE developed in 1970’s by University of California,

Berkeley (entirely text-based initially)

PSPICE:

Adapted version of SPICE developed by Microsym in 1984

A graphical user interface called “Schematics” was added

Schematics was improved and renamed as “Capture” by

Orcad who acquired Microsym later.

Sources of PSpice software

Cadence Orcad PSpice:

Demo versions of the software can be downloaded free from http://www.cadence.com/products/orcad/pages/ downloads.aspx

Rooms 3204, 3208, 3203 and 3505 in Nguyen

Engineering Building also have full versions of

PSpice installed.

Installation from Cadence Website

Extract all files from the downloaded folder

Locate and run setup.exe from

….\16.6_OrCAD_Lite_All_Products\Lite Full\Disk1

To open Orcad Capture, go to

All Programs > Cadence > OrCAD 16.6 Lite > OrCAD Capture CIS Lite

Circuit Schematics & Simulation using PSpice

Start a

Project

Draw a

Schematic

Simulate

Circuit

Graph

Data

Remember

Create a new project by using the Analogue or Mixed

A/D setting

Use Pspice subfolder inside the Library folder to add your required libraries

Every circuit should have a PSpice ground

1. Start a Project

File > New > Project

Part

DC Source

2. Draw a Schematic

Part Name Schematic

VDC / Source

Ground (ref. voltage) 0 / SOURCE

Resistor R / ANALOG

Capacitor C / ANALOG

Inductor L / ANALOG

Table 1. Summary of commonly used Parts

2.1 Adding Parts to your Circuit

Go to Place > Part

To add a library, click on the icon shown below

Add library icon

To add a Resistor in your schematic, use

analogue

library, and click open

Cont..

Cont..

Place Part (Enter)

Choose the part, i.e., R

3

2

1

Click Analogue

You can change the value by double clicking here

2.2 Placing a voltage source

2.3 Connect wires

To connect wires choose Place Wire (W)

Drag cursor from one connection point to another. Clicking on any valid

connection will end the wire

Continue connecting the rest of the circuit

2.4 Place Ground

Fig 1. Final Circuit Schematic

Types of Simulation

AC Sweep

Commonly known as frequency response

Used to simulate a circuit with AC source at different frequencies

DC Sweep

Used when it is required to vary the value of a source or a parameter of the circuit

Can provide a starting value, ending value and increment size

Bias Point Analysis (DC)

Used to calculate all node voltages and currents

Time Domain (Transient)

Used to run the circuit for a specified amount of time

3. Simulate Design

To get a curve between voltage V and current I, perform the following steps

Go to PSpice > New simulation profile

Add markers

Voltage

Differential

Voltage

Current

Power

Dissipation

4. Graph Data

After adding Current marker to your schematic, click run and view simulation results to view the graph.

Graph

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