Introduction to PSpice Simulation Software. The Origins of SPICE In the 1960’s, simulation software begins –CANCER Computer Analysis of Nonlinear Circuits,

Introduction to PSpiceIntroduction to PSpice

Simulation SoftwareSimulation Software

The Origins of SPICEThe Origins of SPICE

• In the 1960’s, simulation software begins– CANCER

• Computer Analysis of Nonlinear Circuits, Excluding Radiation

• Developed at the University of California, Berkley• Funded by United States public funds

The Origins of SPICEThe Origins of SPICE

• From CANCER to SPICE– SPICE developed in the 1970’s

• Simulation Program with Integrated Circuit Emphasis

– Developed to save money• Simulation of circuits, not physically building• Transistor sizes

– Microprocessors vs. 2N2222

The Origins of SPICEThe Origins of SPICE

• From SPICE to SPICE2– SPICE 2 was in response to the wonderful

acceptance of SPICE• Comments, questions, and complaints found their

way back to UC-Berkley

– SPICE 2 was released into the public domain• This means its free to use in the United States

– Commercial versions that offer much more support and features

That Was ThenThat Was Then

• The original way of entering circuit information– A text file with syntax specific to the simulator

• Easy to remember commands and syntax– R – Resistor– C – Capacitor– L – Inductor– {Element} {node1} {node2} {value}

• Entered into any text editor with proper syntax

That Was ThenThat Was Then

• The circuit above is shown in the text file to the right

That Was ThenThat Was Then

This Is NowThis Is Now

• New user interface• Graphical circuit

diagrams• Variation of simulation

parameters with a few clicks

First Look at CaptureFirst Look at Capture

• First window you will see when you open Capture

• Create a new Project– File New Project

• This will open a new window

• Select a project name– PSpice Lab Simulation

• Select a project location– C:\PSpice\{YourName}

• Select what type of project– Analog or Mixed A/D

• Click OK

New Project WindowNew Project Window

Create PSpice ProjectCreate PSpice Project

• This window will open• Select the bottom

option– Create a blank project

• Click OK

The Project WindowsThe Project Windows

• The Main Project Window

• Two other information windows– Session Log Window– Project File Window

• Our main window– Schematic 1: Page 1

Place PartsPlace Parts

• Place the 5 resistors– Using Place Part– Type ‘R’ in Part Field

• Place the Voltage Source– Using Place Part– Type ‘Vdc’ in Part

Field

• Right click and choose “End Mode”

Rotate and Move ResistorsRotate and Move Resistors

• Click on the resistor– Use ‘Ctrl+R’ to rotate– Repeat for 4 resistors

• Move and place the resistors in parallel

• Change the values– Double Click on the

‘1k’ and enter ‘4k’ of the parallel resistors

Change the Voltage and WireChange the Voltage and Wire

• Change DC Voltage– Double Click on ‘0Vdc’

and enter ’16Vdc’

• Now wire the circuit– Using Place Wire– Click on one node, and

‘draw’ to the other and click again

• Right click and select “End Mode”

Placing the GroundPlacing the Ground

• Every PSpice circuit must have a ground

• Use the icons on the right– 9th icon down

• This opens the “Place Ground” window

• Select the ‘0/Source’• Click OK

The Completed CircuitThe Completed Circuit

Simulation ProfileSimulation Profile

• Need to create a simulation profile– PSpice New

Simulation Profile

• Name the profile– DC Solution

• Click OK

Edit the Simulation ProfileEdit the Simulation Profile

• Go to the Analysis Tab

• Under the Analysis type, choose Bias Point– This is to find the DC

solution

• Click OK• Ready to Simulate

Running the SimulationRunning the Simulation

• The last step is to RUN the simulation– Do this by selecting PSpice Run

• After running the simulation a new window will open– Close this window and return to the

Schematic 1: Page 1 window

• Use the “V” and “I” (and maybe “W”) icons on the top of the screen – For finding voltages and currents (and power)

Now You KnowNow You Know

• With this basic underlying knowledge– Can change

• Resistor values• Voltage supply values• Resistor configuration

– Can learn• More simulation parameters• More components for simulation

• Time for Lab – Good Luck