Orcad pspice intro and basics

A Beginner's guide to pspice with a simple simulation and the features available in it

1. ORCAD PSPICE Done by, S.Praveenkumar .

2. 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 The name orcad is reflecting the company oregon+CAD . Introduction

3. 1.Draw an electronic or electrical circuit on the computer using Capture . 2. Simulate it with PSpice using specific models for your devices. 3. Analyse its behaviour with Probe , which can produce a range of plots. Historically this was a separate application but it is now integrated with PSpice . steps

4. Non-linear DC analysis(steady state dc) Non-linear transient analysis (sinusoidal sources) Linear AC (circuits with sources of varying frequencies) Noise analysis Sensitivity analysis Distortion analysis Fourier analysis(calculate and plot frequency spectrum) Monte Carlo Analysis Types of Analysis

5. Independent and dependent voltage and current sources Resistors Capacitors Inductors Transmission lines Operational amplifiers Switches Diodes Bipolar transistors MOS transistors JFET MESFET Digital gates 555 and many other essential components. Circuit Components available

6. Toolbar for schematic window toolbars

7. These are files that contain reusable part data. They can be custom or default ones Flat Design Small designs All pages in same schematic Off Page connectors are used Figure shows design hierarchy Libraries and Design Structure

8. Hierarchical Design Much complex designs Symbols are created called “ Hierarchical Blocks” Contd……

9. Part is a basic building block which may represent One or more physical element Function Simulation model When a part is placed for first time its entry is done in “Design Cache”. Parts

10. PSpice is not case sensitive All element names must be unique There must be a node designated "0" (Zero). This is the reference node against which all voltages are calculated . Things to remember before starting

11. File  New  Project  Analog or Mixed A/D Getting Started Make sure to choose Analog or Mixed A/D and proper location for project

12. Next comes following window Make sure you select “Create a blank project”

13. This is how a typical “Schematic” Window will look like

14. Now start placing components and connecting them. After completing the circuit save it and run it

15. Take example of a high pass filter (RC) First we will follow initial steps of creating a new project Now placing the components. Design Example

16. Place the components source and ground

17. Add Probe Probes

18. Go to PSPICE  New Simulation Profile Give a name to profile and create Creating new simulation profile

19. We can choose any of the analysis and options Here AC analysis is done to see operation of filter AC Analysis

20. Go to PSPICE  Run Another waveform window will come up Run See this window to keep track of current simulation

21. The run time can also be adjusted to see the output during a particular time. Result

22. Settings for DC analysis For steady state dc

23. Settings for ac analysis For steady state ac

24. The frequency response of a circuit is helpful to understand its behaviour when it is driven with simple sine waves. Settings for a transient simulation. Transient analysis

25. In optoelectronic integrated circuits and devices apps

26. Thank you!