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Grading Criteria

Attendance 10%

Lab Tasks 30% n ro ec

Lab Exam 20%

Viva 20%

2

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Lab No.01

Getting Familiar with PSpice ands mu at on o as c rcu ts

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Components Available

Independent and dependent voltage and current sources Resistors

Capacitors

Inductors

Mutual inductors

Transmission lines

Operational amplifiers

Switches

Diodes

Bipolar transistors

MOS transistors

JFET

MESFET

Digital gates

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For parts such as resistors, capacitors, and inductors, PSpice usesthe names commonly used in industry. For example resistors are R;capacitors are C; and inductors are L. You can find these parts inthe parts library by typing R, C, or L in the Part Name box of the GetNew Part menu.

Parts like transistors or o -am s must be s ecified exactl as theactual parts are named. For example, you need to type 2N2222 inthe Part Name box for the transistor of that name, not 2222.Similarly for the op-amp, you need to specify LM324. If you typetransistor in the Description Search box of the Get New Part menu,

you may get hundreds of results.

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Sources

Most circuits in PSpice require a source of some kind.

The most common sources used are Vdc, Idc, Vsin and Vpulse

Note that the current source Idc shows the flow of direction of the

electrons, which is the opposite of current.

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More sources There are other sources such as Vac and Iac, but we seldom

use them

Vsin is preferred to Vac because different frequencies can beset in Vsin

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ExampleCompute the voltages and current between every node when V

= 12V DC

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Getting Started

Open up the PSpice Schematics application

Start >> All Programs >> PSpice Student >> Schemetic

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Independent dc Voltage Source

In the open window, click on the space under Part Name and type

VDC. This is the independent voltage source .

When the part shows up click on the Place tab.

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Placing the dc Voltage Source

Click anywhere on the schematic background to place the part and

then right click.

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Voltage Value Setting

Double click the DC source

Click on DC=0V

Type Value

Click Save Attr Button ,

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Resistor Placement

Go back to the Part Draw Basic window and in the space under PartName, type R.

Place one resistor and move the cursor on the background and clickagain. In this way you can place as many resistors as you need.

Right click when done. Rotation of elements:

Select the element

CTRL+R turns the element

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Resistance Value Setting

Double click on each resistor and type in the specified value into

the space shown below.

Click on Save Attr.

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GND placement

Following the same procedure,type GND_EARTH and place thepart on the background.

This for the common ground.

Close the Part window. _ mus e connec e o

a circuit; otherwise, error wouldoccur.

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Placement of all the Parts

Place the parts in such a way that would ease the connection of the

wires.

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Wiring the Parts

Click on Draw on the Menu Bar and on the

drop down menu click on wire.( CTRL + W is

the shortcut)

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Wiring

First click on theterminals/edges of the circuitcomponent.

Then release the mouse button.

Draw until you get to the edgeof the next component itshould be connected to.

Then Click Mouse Button tofinish.

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Circuit Completed

Save your schematic

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Result!

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Graphical Display of the Result

Menu Bar

--Analysis

--Setup

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Analysis Setup Dialog Window

Analysis Setup Window

Check DC Sweep Bar

Click DC SWEEP Window

Name : V1

Sweep Type >> Linear

Start Value -- 0

End Value -- 120

Increment -- 10

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Measurement Probes

Voltage Probe

Current Probe

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Circuit Simulation Analysis

Click on Analysis and then Simulate(F11 is the

shortcut), to simulate the circuit.

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Common error

If your circuit looks like this:

.R1. That is why you see the big dots on either side of the resistanceand the wire running through it. (shown here in red).

Rectify it by deleting the wire running through the resistance.

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Practice Problem

Independent dc Current Source

5 Resistors

Build the following circuit and Simulate it.

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Lab Task

Explain step wise how to draw and simulate acircuit in PSpice.

Consider the following circuit. Analyze the

circuit using techniques learnt in class. Find

the current throu h and volta e across R6

Show all your work. Write neatly and legibly

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contd

Build and simulate the circuit shown on the

previous slide.

Does PSpice give you the same answers that