pspice_dependent sources (1)
TRANSCRIPT
8/20/2019 PSpice_Dependent Sources (1)
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in Cadence/OrCAD PSpice
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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$out tool in PSpice.
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Dependent SourcesType of Source Acrony
mSymbol inText
Part Namein PSpice
Symbol inPSpice
VoltageControlled
Voltage Source VCVS E
CurrentControlled
Current SourceCCCS F
VoltageControlled
Current SourceVCCS G
CurrentControlled
Voltage SourceCCVS H
where a is a cofficient and I and V are the current and voltage at some other point in thecircuit.
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CCCS I#ple#entation in PSpice
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Part %Double clic& on % to set the value of the
coecient 'a ( ) in this e"a#ple* that is
#ultiplied b$ 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.