electric testing -pspice

8/2/2019 Electric Testing -PSpice

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PSpice


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Introduction

PSPICE is a circuit analysis tool that allows theuser to simulate a circuit and extract keyvoltages and currents.

Information is entered into PSPICE via one of

two methods Net List

Schematic


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Net List


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Net List FormatNet List is list of components and the nets (or nodes) thatconnect them together.

The net list consists of:

The Title Line: This should contain information to thecircuit and your name ( you can live it blank).

The Circuit Parameters (R1, C1, VS) as many as needed. The Output Control statements.

statement, to close the file.

* & ; are comments ignored by the program


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Net List Circuit ParametersLetter Circuit Element

R Resistor

C Capacitor

L Inductor

K Mutual InductorV Independent voltage source

I Independent current source

M MOSFET

D Diode

Q Bipolar transistor

W transmission lineX Subcircuit

E Voltage-controlled voltage source

G Voltage-controlled current source

H Current-controlled voltage source

F Current-controlled current source


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Units


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Parameter Syntax

Resistor:

R [+ node] [- node] [value]

Capacitor:

C[+ node][- node][value] [IC=, optional]

Inductor

L[+ node][- node][value] [IC=, optional]

Independent Sources

I [- node] [+ node] [value] [type] [transient spec]

V [+ node] [- node] [value] [type] [transient spec]


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Example 1

1. Determine and number the nodes2. The ground is always node 03. Write the program

*Circuit nameCircuit element

R, V, I, L, C , D, Tr,etc

. analysis type

.end


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Node 3

Node 1Node 2

*node voltages V 1 0 DC 10VR3 1 2 4OHM

R1 2 3 7OHMR2 2 3 10OHMR4 3 0 9OHM.op

.end


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Start >> Orcad >> PSPICE AD


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First close and reopen the file


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Type of analysis

1. DC analysis

a. DC Bias Point Detailsb. DC Sweep

c. Transfer Function

2. AC analysis

3. Transient analysis : Time Domain Analysis


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DC Analysis

1. DC operating point

Measure all the voltage nodes Measure the current being supplied by thepower supply

Measure the circuit consuming power


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Example 2


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DC analysis

2. DC sweep

.DC [LIN] {varname} {start} {end} {incr}

.DC [OCT][DEC] {varname} {start} {end} {points}

Examples:.DC VIN -.25 .25 .05

.DC V1 list 5 9 12


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*DC sweep1

V1 1 0 10

R1 1 0 1k

.DC V1 0 12 1

.end


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Output !!


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Output:

1. Printing any value

.PRINT [DC][AC][NOISE][TRAN] [{output variable}*]

.PRINT DC V(3) V(2,3) V(R1) IB(Q13)

2. Plot any relation

.PLOT [DC][AC][NOISE][TRAN] [ [{output variable}*]

.PLOT DC V(3) V(2,3) V(R1) I(VIN)

.PROBE [output variable]*

.PROBE

.PROBE V(3) VM(2) I(VIN)


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DC sweep

*DC sweep1

V1 1 0 10

R1 1 0 1k.DC V1 0 12 1

.print DC V(R1)

.end


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DC sweep

*DC sweep2

V1 1 0 10R1 1 2 1k

Vy 2 0 0

.DC V1 0 12 1

.Plot DC I(vy)

.end


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DC sweep


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DC sweep

*DC sweep3

V1 1 0 10

R1 1 2 1k Vy 2 0 0

.DC V1 0 12 1

.Probe

.end


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DC sweep


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DC sweep


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DC sweep


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DC sweep


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DC sweep


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DC sweep


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DC sweep


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DC sweep


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DC sweep


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DC sweep

Plot V(R2) V(1,2) I(R2) I(V1)


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* V1 1 0 20R1 1 2 1kR2 2 3 1kR3 3 0 1kI1 2 3 20m

.DC V1 list 5 9 12 I1 list 4 8.probe DC V(R2) V(1,2) I(R2) I(V1)

.end

DC sweep


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Example

Find

1. All node voltages2. The current and the power dissipation of the

voltage sources

3. The current through all resistors


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Repeat the above problem for V1=100,120 and150V

Repeat the above problem for V1=100,120 and150V and V2=80,110 and 140V

Example


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Schematic


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Capture sessionframe.You do all yourschematic designand processing

within this window

Session log lists theevents that haveoccurred during thecurrent Capturesession, includingmessages resultingfrom using

Captures tools

Start >> Orcad >> Capture CIS


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Analog or Mixed-SignalA/D is used to simulateanalog and/or digital circuitsusing PSpice.

PC Board Wizardwhilewe focus on designing PCBs.

Programmable Logic

Wizardis for working withprogrammable devices

Schematic is basically just

a design file.


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Project : .OlbDesign: .DSNOnly one in project


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The schematic page editor


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Schematic


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Schematic Pages

Component used in design

Libraries used in design

Output Files

Project Manager


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Design steps

1) Draw the circuit

a) Place components and define its values.b) Place Wires

c) Place Ground

2) Specify the type of analysis

3) Simulation


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Use only Libraries inPSPICE folder [its onlycan be simulated], otherlibraries only for

schematic and layout


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DC analysis

1. DC Bias Point Details

2. DC Sweep

AC analysis

Transient analysis :

Time Domain Analysis


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Bias Point

Bias Point


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Or you can choose the markers from hereAnd place it on the point you want to measure


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Exercise 1


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Plot Axis SettingsX-axis >>6.0 to 10.0 voltsY-axis >>3.0 to 5.0


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Param Part

In this circuit we select RL as a circuit parameter :

Replace RL default value it by a name e.g. {Rvar}

Note thatThe variable resistance name must be enclosed in curly brackets{}.

The PARAM part, from the SPECIAL.OLB library, is very useful forinvestigating circuit behavior for a range of part values.


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Simulation Settings

Create a simulation profile Select DC Sweep Select Global parameter Enter Rvar in the parameter name Make Rvar is varied Linearly from 1 to 300 in increments of 1 .

Plot the output on RL

Modify the simulation profile bychoosing secondary sweep too and varythe voltage source

Plot the output on RL


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Transient Analysis


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Change time to 10 us, then

simulation >> run


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V1 = 0 For the pulse, the beginning voltage level V2 = 1 For the pulse, the ending voltage levelTD = 0 The delay time of the pulse, from the simulation starting point(0 sec)

TR = 0 The risetimeTF = 0 The falltimePW = 3u The pulse widthPER = 6u The period of the pulse


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AC Analysis


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-Transient analysis for 3ms- Add markers at R1, R2 and L1


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electric testing -pspice

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