OrCad & Spice Tutorial By, Ronak Gandhi Syracuse University

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OrCad & Spice Tutorial By, Ronak Gandhi Syracuse University Brief overview: OrCad is a suite of tools from Cadence for the design and layout of circuit design and PCB design.

1 OrCad & Spice Tutorial By, Ronak Gandhi Syracuse University Brief overview: OrCad is a suite of tools from Cadence for the design and layout of circuit design and PCB design. We are currently using version 16.2 of the OrCad suite. This document will guide through the entire flow in designing circuit board from start to finish. Our main purpose is to demonstrate concepts of circuit design and introduce the tools behind completing a PCB design. Getting Started: Step 1: Starting the OrCad tool Start OrCad from START>All Programs>OrCad 16.2>OrCad CIS Capture. If you are starting the first time you will get window to select suite from the list. Choose Use OrCad_Capture_CIS_option and click OK. Fig: 1 Note: The difference between OrCad Capture and CIS capture is the addition of the component information system, or CIS. The CIS links component information, such as printed circuit board package footprint data or simulation behavior data, with the circuit symbol in the schematic. When exported to other tools in the OrCad design suite, the data stored in the CIS is also transferred to the other tool. Thus, when a design engineer exports a schematic to the circuit board layout utility, the majority of the circuit elements have footprints linked to them. This saves time for the design.

: Grove_tutorial) and Location (Preferred to use your home directory H:).

2 Step 2: Creating Project and Schematic file Start an new project FILE>New>Project. Enter the Project Name: (E.g.: Grove_tutorial) and Location (Preferred to use your home directory H:). Make sure that the Analog and Mixed A/D option is chosen in Create a new project using option and click OK. See Fig.2. You should see an empty schematic page and a project window like in Fig 3. Fig.2 Fig.3

3 Step.3: Adding Component form Library to Schematic design First we must add a new library to our design. To do this, click File> New> Library. Your project window will now look like the figure on the left. You have added all lib components in your design by right click on Library>Add File or Click on Place part Symbol as shown below. Click on place part and then Place Part window will appear on to your right. Add ( )or delete ( ) the library files from the list. To place on Schematic window, Search for part, select the library then select the part from the part list and double click on the part to add to the schematic window. To place component select the component form the Place part and double click on it. And now move your mouse to place the component on the Schematic window. You can use the same component multiple times till you end the mode component mode. After placing the component you need to end the component placement mode by pressing Esc. Every time you need to place a new component you need to follow the above procedure. To change the value of the component double click on the component value (Usually denoted by the part name followed by number e.g. Capacitor will have 2 labels C which is the name and C1 is the component value that you need to modify) Note: OrCad allows you to create a library of part symbols for use in schematic entry. These libraries are kept in separate files that are included in the project workspace. This allows you to reuse libraries in their designs.

5 Before starting with the simulation you need to insert probes at points of interest or turn on the V/I/P biasing display.

4 Step.4: Interconnecting the component You can use different line option as shown in Fig.5 for interconnecting the design. The thinner lines are pin to pin connection and thick line are for bus connection. Step 5: Simulating design Fig.5 Before starting with the simulation you need to insert probes at points of interest or turn on the V/I/P biasing display. There are different probes available in the tool bar corresponding to different measuring instrument as shown in fig.6. Fig.6 After connecting you design you need to simulate your design to verify the response of your design. To start simulation Click on Pspice>New Simulation Profile Note: If the schematic design has error it will allow you to create a new simulation or will display you netlist file with the error in the circuit. Don t proceed to simulation unless the command window shows no error report.

Now enter your simulation file Name. If you are inheriting some simulation file form other project specify the path, else the default setting will remain None then Click Create. Fig.7 Fig.

5 Now enter your simulation file Name. If you are inheriting some simulation file form other project specify the path, else the default setting will remain None then Click Create. Fig.7 Fig.8 show the Simulation setting window. Click on Analysis and then choose your appropriate analysis type and its Options. Provide appropriate run time specification and then Click OK. Run you design form the Pspice option or click on Play button on your tool bar. Fig.8 You must see the response of the schematic on the new Schematic1 Pspice A/D screen. If you need to add some check points follow step 4 and re run your design.

6 Examples 1: Design an integrator using Opamp and measure the input and output voltage Example 2: Design an RLC circuit given below and find its pulse response at R4 and R5 resistor.

7 Appendix A Short cut keys Operation P Place Part W Place Wire F Power G Ground T Text N Net name or alias I Zoom IN O Zoom OUT Control+A Select All Control+Z UnDo R Rotate Component H Mirror Horizontally V Mirror Vertically Appendix B Unit Symbol for basic components

1. INTRODUCTION. PSpice with OrCAD Capture (release 16.6 edition)

1. INTRODUCTION. PSpice with OrCAD Capture (release 16.6 edition) 1. INTRODUCTION SPICE (Simulation Program for Integrated Circuits Emphasis.) is a powerful general purpose analog and mixed-mode circuit simulator that is used to verify circuit designs and to predict