Introduction to Elementary Circuit Simulations with PSpice

1. Introduction to Elementary Circuit Simulations with PSpice Course: EEL 3110 Professor: Dr. Subbarao V WunnavaPh.D.,P.E., Course coordinator: Dr. Gus RoigPh.D, Teaching Associate: Mr. Mohammad Saiful Islam Ph.D candidate

2. Introduction • SPICE (Simulation Program for Integrated Circuits Emphasis) is a general purpose analog circuit simulator that is used to verify circuit designs and to predict the circuit behavior. • PSpice is a PC version of SPICE and HSpice is a version that runs on workstations and larger computers. • PSpice has analog and digital libraries of standard components (such as NAND, NOR, flip-flops, and other digital gates, op amps, etc) which makes it a useful tool for a wide range of analog and digital applications.

3. Types of Analysis • Non-linear DC analysis • Non-linear transient analysis • Linear AC Analysis • Noise analysis • Sensitivity analysis • Distortion analysis • Fourier analysis • Monte Carlo Analysis

4. Circuit Components available • Independent and dependent voltage and current sources • Resistors • Capacitors • Inductors • Mutual inductors • Transmission lines • Operational amplifiers • Switches • Diodes • Bipolar transistors • MOS transistors • JFET • MESFET • Digital gates

5. File structure PSPICE (Capture) • Input file for PSpice that has the file type “.CIR” • When a circuit is simulated “.OUT” is generated • “*.DAT” file is by default a binary file to see the data • “*.LIB” files where the details of complex parts are saved • Additional files • *.SCH (the schematic data, itself) • *.ALS (alias files) • *.NET (network connection files)

6. Libraries • These are files that contain reusable part data. • They can be custom or default ones • Some of the libraries available in the Evaluation version of PSPICE are: • abm.slb for special functions like square root and multipliers • analog.slb for analog components like resistors and capacitors • breakout.slb for pots • connect.slb, .plb for connectors • eval.slb, .plb for semiconductor, digital devices, switches • port.slb for grounds, high/low digital ports • special.slb for ammeters, viewpoints • source.slb for various analog and digital sources

7. Hierarchical Design • Much complex designs • Symbols are created called “Hierarchical Blocks”

8. Outline • Where can you access PSpice? • To Get PSpice via Cadence OrCAD Site • Introduction to OrCAD Demo • Drawing Circuits with Capture CIS • Bias Point Analysis with PSpice • DC Analysis with PSpice • Transient Analysis with PSpice • AC Analysis with PSpice • FAQ

9. Where can you access PSpice? • Two way to get PSpice • http://www.cadence.com/ • You can find OrCAD 16.5 Demo here. • Your disc in Sedra/Smith • You can find OrCAD 9.2 Lite here. • Which one to use? • They are almost the same. • You can choose one of them. • The following shows the use of OrCAD 16.5 Demo.

11. To Get PSpice via Cadence OrCAD Site • How to get the setup file? • Go to http://www.cadence.com/ , select Products – OrCAD Products, and find Demo CD Request for the OrCAD 16.3 Demo download page. • Click Download FREE - OrCAD 16.3 Demo Software … design files. • You may need to register an account to access the download page. • Note: The following demonstration from slide 5 to 20 shows the procedure downloading 16.0 Demo. The screen captures are similar when downloading 16.3 Demo.

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20. Introduction to OrCAD Demo Limits exist since it is a lite version or a demo The following limits apply to the Demo/Lite Version of the products: • PSpice A/DCircuit simulation is limited to circuits with up to: • 64 nodes • 10 transistors • 65 digital primitive devices • 10 transmission lines in total (ideal or non-ideal) • 4 pairwise coupled transmission lines.

21. Introduction to OrCAD Demo • Limits [cont'd] • PSpice A/D [cont'd] • The sample library includes 39 analog and 134 digital parts. • Device characterization in the PSpice Model Editor is limited to diodes. • Stimulus generation in the PSpice Stimulus Editor is limited to sine waves (analog) and clocks (digital). • Circuit optimization with the PSpice Optimizer is limited to one goal, one parameter, and one constraint. • You can not create CSDF format data files. • You can only display simulation data from simulations performed with the Demo/Lite Version of the simulator.

22. Introduction to OrCAD Demo • Limits [cont'd] • Capture CIS • The PSpice libraries are the only ones included. The standard Capture libraries are not included. • Import facilities, netlisters, and accessories that are not relevant to PSpice are not included. • You can not save a design that contains more than 60 parts. (You can view or create larger designs, but you can not save them.) • You can not save a library that contains more than 15 parts.

23. Introduction to OrCAD Demo • Minimum hardware requirements • Pentium 4 (32-bit) equivalent or faster • Windows XP, Windows Vista, or Windows 7 • Minimum 512MB RAM (1GB recommended) • 300MB swap space (or more) • DVD-ROM drive • 65,000 color Windows display with minimum 1024x768 (1280x1024 recommanded)

24. Notes When Set OrCAD Demo Up • In the procedure installing… • Make sure you are connected to the internet. • Run “Product/Demo Installation” only. • Don’t set the control file. • Choose to install “Capture CIS” and “PSpice” only. • Keep “Footprint Viewer Options” to be “None.” • Cancel “License Client Configuration.” • For the first time execution… • Run “PSpice AD” first, close it, and then you can run “Capture CIS” and use the function of PSpice.

26. Agree, of course!

28. Check this if you feel troubled

29. Close it

31. Check this if you feel troubled

33. Drawing Circuits with Capture CIS • To simulate a circuit, we need to figure out the structure of the circuit. Capture CIS helps us to do that. • Create a new project with Analog or Mixed A/D wizard after selecting a proper folder to save. • Place the elements (even if it is the ground) that are in the PSpice libraries. • Place the tags (if needed) that are in capsym.olb .

39. %OrCAD%\tools\capture\library\pspice\demo Add all of them

41. Frequently Used Elements • R (resistor) / L (inductor) / C (capacitor) • D (diode) • D1N4002 • D1N750 • MBreakN / MBreakN4D (NMOS) • MBreakP / MBreakP4D (PMOS) • QBreakN (NPN BJT) • Q2N2222

42. Frequently Used Elements • QBreakP (PNP BJT) • Q2N2097A • uA741 • VDC / VPULSE / VSin / VSRC • IDC / IPULSE / ISin / ISRC • GND

45. Bias Point Analysis with PSpice • Where to find elements? • Place → Part or find the “Place Part” button on the toolbar • Pick the element you want • Click OK button • How to link the elements? • Find Place Wire button on the toolbar • Link the elements you want • NOTE:wire crossing without big dot → openwire crossing with big dot → short

46. Place Wire

47. Bias Point Analysis with PSpice • How to simulate? • PSpice → New Simulation Profile • Fill out the profile name • Select Bias Point in Analysis Type • Click OK • PSpice → Run

49. profile name as your wish