pspice_dependent sources (1)

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Page 1: PSpice_Dependent Sources (1)

8/20/2019 PSpice_Dependent Sources (1)

http://slidepdf.com/reader/full/pspicedependent-sources-1 1/15

in Cadence/OrCAD PSpice

Page 2: PSpice_Dependent Sources (1)

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Objective of LectureIntroduce the parts in PSpice for dependent

voltage and current sources.

Describe how to set the part properties to setthe coecient a for the dependent source.

!"plain so#e issues that arise whenconnecting these parts in the sche#atics

la$out tool in PSpice.

Page 3: PSpice_Dependent Sources (1)

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Dependent SourcesType of Source Acrony

mSymbol inText

Part Namein PSpice

Symbol inPSpice

VoltageControlled

Voltage Source VCVS E

CurrentControlled

Current SourceCCCS F

VoltageControlled

Current SourceVCCS G

CurrentControlled

Voltage SourceCCVS H

where a is a cofficient and I and V are the current and voltage at some other point in thecircuit.

Page 4: PSpice_Dependent Sources (1)

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CCCS I#ple#entation in PSpice

Page 5: PSpice_Dependent Sources (1)

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Part %Double clic& on % to set the value of the

coecient 'a ( ) in this e"a#ple* that is

#ultiplied b$ the current through +, to setthe current through the dependent currentsource.

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La$out IssuesWrong T!e dependent current"ource #ill act a" a "!ort acro""$%

Correct T!e current t!at&o#" t!roug! $% enter" t!edependent current "ource'

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La$out Issues -o i#ple#ent the circuit e"actl$ in PSpice the

wires to Part % had to crisscross each other onthe input and output ter#inals in order to getthe direction of the arrows to follow thedirection of the currents in the original circuit.

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La$out Issues(ot! of t!e #ire" #ereextended out laterally fromPart F before running one

acro"" t!e ot!er #ire'

)f t!i" #a" not done* aconnection bet#een t!eterminal on Part F #ould !a+ebeen automatically made'A node , dot , #ould "!o# up

on t!e circuit "c!ematic-*creating a "!ort bet#een t!et#o #ire"'

0ode createdb$ criss

crossing wires

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La$out Issues -o #ini#i1e running wires li&e this $ou can

change the orientation of the part in thecircuit.

2e$stro&e shortcuts in OrCAD PSpiceCnt+ is +otate

Cnt% is %lip

Cnt3 is 3irror

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La$out Issues.riginal layout

After rotating and&ipping Part F'

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La$out IssuesAlternativel$ $ou can changed the sign on

the coecient % on Part % to eli#inate one ofthe crisscrossing connections.

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4C4S

 -he connections for the reference voltage used to set thevoltage controlled voltage source are #ade across theco#ponent with the sides on the part #atching the signs for 4+ 

on the circuit.

I#ple#entation inPSpice

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CC4S I#ple#entation inPSpice

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4CCS I#ple#entation inPSpice

Changing the sign on the coecient of the reference voltage inPart 5 eli#inated the need to crisscross wires on the current

source side of the 4CCS.

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Su##ar$ -he na#es of the parts in PSpice that are

dependent sources have been identi6ed and thewa$ to #odif$ the coecient a was de#onstrated.

4C4S7 Part !CCCS7 Part %

4CCS7 Part 5

CC4S7 Part 8

 -he control portion of the part is incorporated intothe circuit in the sa#e #anner that a voltage orcurrent #easure#ent is #ade using a digital#ulti#eter.