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Dennis Fitzpatrick, in, 2018PSpice models can be created and edited in the PSpice Model Editor, which can be started in standalone mode from the Start menu, PSpice Simulation Accessories Model Editor, or by highlighting a PSpice part in the schematic in Capture, rmb Edit PSpice Model. When you edit a PSpice part from Capture, a copy of the PSpice model is created in a library file, which will have the same name as the project, i.e.lib. This is so that the original PSpice model does not get modified. The copied library is written to the project file and can be seen as one of the Configured PSpice libraries in the Project Manager. Whenever you create a new Capture part for a PSpice model, you need to reference the library in which the model can be found by providing the path to the library file in the simulation profile under the Configuration Files Category Library.
Dennis Fitzpatrick, in, 2012PSpice models can be created and edited in the PSpice Model Editor, which can be started in standalone mode from the Start menu, PSpice Simulation Accessories Model Editor, or by highlighting a PSpice part in the schematic in Capture, rmb Edit PSpice Model. When you edit a PSpice part from Capture, a copy of the PSpice model is created in a library file, which will have the same name as the project, i.e.lib.
This is so that the original PSpice model does not get modified. The copied library is written to the project file and can be seen as one of the Configured PSpice libraries in the Project Manager. Whenever you create a new Capture part for a PSpice model, you need to reference the library in which the model can be found by providing the path to the library file in the simulation profile under the Configuration Files Category Library. Kraig Mitzner, in, 2009Chapter 7 explains how to construct Capture parts using the Capture Library Manager and Part Editor and the PSpice Model Editor. Heterogeneous and homogeneous parts are developed in examples using four methods.
Different methods are used depending on whether a part will be used for simple schematic entry, design projects intended for PCB layout, PSpice simulations, or all of these. The chapter also demonstrates how to attach PSpice models to Capture’s schematic parts using PSpice models downloaded from the Internet and basic PSpice models developed from functional Capture projects. The Capture parts can then be used for both PSpice simulations and PCB layout as demonstrated in Chapter 9. Kraig Mitzner, in, 2009 Publisher SummaryThis chapter discusses how to construct Capture parts using the Capture Library Manager and Part Editor and the PSpice Model Editor. Capture provides many libraries of parts that one can use to build your schematic, perform simulations, and generate Printed Circuit Board (PCB) layouts. Users can build custom parts and save them to existing or new libraries, modify existing parts and save them to a library, or modify and save parts to just a specific project. One package contains one or more parts.
All the parts can be the same (homogeneous), or the parts can be different (heterogeneous), and either type of part can be passive or active. Heterogeneous and homogeneous parts are developed in examples using four methods. Three of the methods are completed from the Capture Library Manager and the fourth is initiated from the PSpice Model Editor and finished with the Capture Library Manager. PCB footprints can be assigned to any of the parts regardless of how it was constructed, and the footprints can be assigned when the parts are first constructed or assigned later when the parts are actually used in a design. Different methods are used depending on whether a part will be used for simple schematic entry, design projects intended for PCB layout, PSpice simulations, or all of these.
The chapter also demonstrates how to attach PSpice models to Capture's schematic parts using PSpice models downloaded from the Internet and basic PSpice models developed from functional Capture projects. The Capture parts can then be used for both PSpice simulations and PCB layout.
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Transistor datasheets normally give two values for device power dissipation, one for ambient temperature and one for case temperature. Two values are also given for thermal resistances (Rth): junction to ambient and junction to case. If you use a heatsink, then the thermal resistance from junction to ambient is given by the sum of the transistor junction to case and heatsink thermal resistances. With no heatsink, the thermal resistance is given by the value of the transistor junction to ambient (see Fig. You need to use a transistor with a higher power dissipation specification, for example, a ZTX450 from the Zetex library.
The standard derating is 0.8 for collector current and 0.75 for power dissipation. Alternatively, you can add a heatsink to the transistor. R4 is the load resistance and is not part of the circuit. However, you can assign a value of 5 W to the resistor POWER property via the Property Editor just to dismiss the red bar. 10.Replace the Q2N3904 with a ZTX450 from the Zetex library. 11.Run the transient analysis. 12.Run the Smoke analysis.
OrCAD PCB Designer Professional with PSpice is a PCB design software for most of the designs developed today. The PCB software already has the circuit diagram module OrCAD Capture and OrCAD PCB Editor with integrated Constraint Manager. The scalable OrCAD / Allegro PCB platform provides investment protection for the user, as increasing technical requirements based on the same data base can be used to upgrade to more powerful Allegro licenses. Several design rule checks are performed in real time to help the designer implement the design intent and follow all design rules. It includes a full version of PSpice A/D and Smoke option for reliability analysis.
Schematic Entry OrCAD Capture Schematic Entry with OrCAD CaptureOrCAD Capture schematic entry tool for circuit diagrams is one of the world's most widely used software for entering and documenting electrical circuits. OrCAD Capture uses flat or hierarchical schematics.
Via the navigation window the different pages of the schematic can be selected and thematically managed according to functional blocks. By using the integrated interface, it is also possible to use parts from Ultra Librarian and SamacSys, which offer millions of components. The electrical connections between the component pins can be established quickly and rules can already be defined on schematic level.
SPECCTRA auto router SPECCTRA auto routerThe SPECCTRA auto router can help to complete the routing of a PCB without a limit in layers. To influence the layout several parameters can be adjusted, such as fanout and routing direction. The auto router in OrCAD Professional also takes high speed rules like propagation delay into account.
A router might not do the complete board, but when used wisely it supports the PCB designer to finish digital elements with constraints faster. Feasibility studies are done in minutes and give an indication, if the board is routable with this number of layers. Auto-interactive routing commands support the user in manipulation the automatically done routing. OrCAD Scalability OrCAD ScalabilityOrCAD PCB Designer is based on Allegro PCB design technology and both (OrCAD and Allegro) use the same design database. The difference in the licenses is the feature set how to automatically edit and verify the design. The number of design rule checks varies by the type of license. The big advantage is, that you only pay for the functionality you need.
When working in a team with multiple licenses, you can check out and use the license you need to perform a certain task or check. All information is stored in the same database. DRC Error Online Design Rule Check DRC and DFM ChecksDuring routing, the tool checks whether design rules are violated in real-time. When errors are caused, e.g.
By placing a component in an unauthorized location, the tool will highlight a design rule violation. All rules defined in Constraint Manager can be checked. Unique for PCB layout tools are the more than 250 integrated DFM checks, which check against specifications of the PCB fabricator, assembly service provider or test facility, by automatically reading in their rules sets.
OrCAD PCB Flow Integration PSpice for Reliability SimulationOrCAD PCB Designer Professional includes a full version of PSpice A/D incl. Smoke option. With this feature set you can perform a stress analysis of components and ensure you have components reliability as needed. Maximum de-rating of components can be determined and thus make a statement about the component load. The load can be specified in percent via model parameters. The developer is interested in statements about the types of load: thermal at maximum current and highest possible voltage, conduction of junction temperature in °C or thermal contact resistances jC and jA, as they occur in the circuit. Real-Time Feedback and ECOReal-time feedback and design synchronization helps keep the data between your CAD tools in check, so you don’t have to manually identify and resolve the errors or differences.As you work on your schematic, enable the online DRC check for any rule to be automatically notified of any issues that occur as you design.
Clicking on any of the warnings or errors from the list, immediately takes you to the issue on the canvas. Once you’ve resolved the errors, you can easily compare the data in your schematic versus the data in your PCB editor and see a preview of what has been modified between the designs. About usFlowCAD is a solution provider for electronics developers in Central Europe. With products from leading manufacturers, FlowCAD provides a CAD flow for PCB design. This CAD flow includes modules for circuit diagram, PCB layout, signal integrity analysis, power integrity analysis, thermal simulation and circuit simulation as well as hardware for protocol analysis of high-speed interfaces and boundary scan.FlowCAD also provides services such as PCB layout service (OrCAD, Allegro, Altium), library creation for symbols, footprints and models, order simulations (Sigrity, PSpice, ANSYS, Nextra air and creepage distances).