PSPICE Tutorial

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PSPICE Tutorial

• Part 1 Installing, Project creation, Schematic
  Circuit set-up, Edit PSpice Model

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When installing Orcad Lite 9.2

• In Orcad Lite Set Up - Enable both Capture and
  PSPICE!

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Lets simulate the discrete CS amplifier example

• Phase 1 Project Creation ? Schematic
  Creation ? Components Libraries Configuration ?
  Components Layout ? Wiring ? Components Values ?
  Simulation Profile Creation

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Creating New Project

• File New ? Project
• In New Project window project name is
  arbitrary, note Using and Location entries.

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Two windows Project Manager and Schematic
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Project Manager operations

• Enable by clicking on (), and it turns to (-).
• Enable both project and Schematic.
• Right-click on Schematic1 to rename it.

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Clicking on the Schematic page brings up the
right toolbar

• Most frequently used icons
• First Place Part
• Second Place Wire
• Third Place net alias (i.e. node labeling)
• Eighth Place Ground

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Click Place Part icon ? Click Add Library ?
In Browse File box right-click-drag to select
all libraries ? Click Select ? Finally click
Cancel to leave this mode
This process needs to be done only once per
project. Libraries are then configured for all
schematics.
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Only one ground type will do!

• Click on Place Ground ? Click Add
  Libraries ? Open PSpice folder ? Open Source
  library ? Select 0 ? Click Cancel

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Lets start by placing an NMOS in the schematic
Click OK to place the part. Right-click and
then End Mode to stop parts production.

• Click Place Part ? Select Breakout library
  ? Scroll to and select MbreakN (for a
  4-terminal NMOS). For PMOS take MbreakP.

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Placing all the parts

• R,C from Analog library VDC,VSIN from
  Source library 0 from the Ground library.

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Click-select part to move it, or after
right-clicking to rotate it
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Wiring the components -1
(Can stop mid-way if need to route wire by 900
more than once)

• Click Place Wire ? Drag cross-hair to a
  component terminal ? Left-click and let go ?Drag
  to next terminal and left-click to establish wire

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Wiring the components - 2
(If you short circuit Source to Substrate too
close to the component you may not be able to
undo it)

• Red dots show up when two wires meet
  electrically. Red dots in unwanted or odd places
  may indicate spurious wires that need to be
  removed (i.e. selected and deleted)

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Double-click on components value to change it
(In PSPICE 1MO is written 1meg. 1M 1
milli-Ohm)
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Adding Node Labels

• Click on N1 icon ? Type name, such as in or
  out, etc ? Move label frame so that it touches
  the respective wire.
• By clicking on components name (say R1), can
  change its name to, say, RG1.

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Transistors parameters -1

• Click-select NMOS. Then? Edit PSpice Model ?
  Model Editor opens up.

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Transistors Parameters - 2

• First, create a new name for the component
• Place cursor to left of and put in some
  descriptive name.
• Dont save yet.

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Transistors Parameters - 3

• Next, type in the SPICE code (in the right field)
• SPICE code starts with symbol. No spaces.
• Full list of permissible parameters can be found
  in the PSPICE Reference Manual (one of the
  on-screen documentation files that came on your
  CD).

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Transistors Parameters - 4

• Note that KPs units are A/V2!
• Units of W,L are meter. Therefore, L4u means
  L4µm.
• When you are done typing the code, Save.
• Before leaving Model Editor, you may want to
  display the parameters on the circuit schematics.

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Displaying Transistors Parameters Method 1

• Return to the Schematic page.
• In upper toolbar click Place, and select
  Text.
• A Text Edit window opens up. Type the MOSFET
  parameters LEVEL1, VTO1V,. You may press
  CtrlEnter to start text new lines, for a more
  compact presentation.
• Place text block somewhere near transistor. You
  may also place a line (using PlaceLine) to
  connect textbox to the right transistor.

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Displaying Transistors Parameters Method 2

• Return to the Schematic page.
• Double-click on the MbreakN component to open a
  Property Editor.
• Click Add New Column, and type LEVEL, add a
  value 1. Select both cells and click Display.
  Select Name and Value.
• Repeat for each parameter.

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Resulting Displays