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8/12/2019 PSpice Dependent Sources
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in Cadence/OrCAD PSpice
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Objective of LectureIntroduce the parts in PSpice for dependent voltageand current sources.
Describe how to set the part properties to set thecoefficient a for the dependent source.Explain some issues that arise when connecting theseparts in the schematics layout tool in PSpice.
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Dependent SourcesType of Source Acronym Symbol in
TextPart Namein PSpice
Symbol inPSpice
VoltageControlled
Voltage Source VCVS ECurrent
ControlledCurrent Source
CCCS F
VoltageControlled
Current Source VCCS G
CurrentControlled
Voltage SourceCCVS H
where a is a cofficient and I and V are the current and voltage at some other point in the circuit.
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CCCS Implementation in PSpice
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Part FDouble click on F to set the value of the coefficient(a = 3 in this example) that is multiplied by the
current through R1 to set the current through thedependent current source.
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Layout Issues Wrong: The dependent currentsource will act as a short across R1
Correct: The current that flowsthrough R1 enters the dependentcurrent source.
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Layout IssuesTo implement the circuit exactly in PSpice, the wires toPart F had to criss-cross each other on the input andoutput terminals in order to get the direction of thearrows to follow the direction of the currents in theoriginal circuit.
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Layout IssuesBoth of the wires were extendedout laterally from Part F beforerunning one across the other
wire.
If this was not done, a connectionbetween the terminal on Part F would have been automaticallymade. A node dot would show up onthe circuit schematic), creating a
short between the two wires.
Node created bycriss-crossing
wires
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Layout IssuesTo minimize running wires like this, you can changethe orientation of the part in the circuit.
Keystroke shortcuts in OrCAD PSpiceCnt-R is RotateCnt-F is FlipCnt-M is Mirror
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Layout IssuesOriginal layout
After rotating andflipping Part F.
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Layout Issues Alternatively, you can changed the sign on thecoefficient, F, on Part F to eliminate one of the criss-crossing connections.
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VCVS
The connections for the reference voltage used to set the voltagecontrolled voltage source are made across the component with the sideson the part matching the signs for V R on the circuit.
Implementation in PSpice
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CCVS Implementation in PSpice
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VCCS Implementation in PSpice
Changing the sign on the coefficient of the reference voltage in Part Geliminated the need to criss-cross wires on the current source side of the
VCCS.
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SummaryThe names of the parts in PSpice that are dependentsources have been identified and the way to modifythe coefficient a was demonstrated.
VCVS: Part ECCCS: Part F VCCS: Part G
CCVS: Part HThe control portion of the part is incorporated into thecircuit in the same manner that a voltage or currentmeasurement is made using a digital multimeter.