Circuit Files

PSman Circuit Files. Click on the Browse button to specify a different directory ... 

You can use this dialog box to change the current directory and to create a new directory. Select a directory in which to save your circuit files and then click the OK button ... 

Creating circuit file action KARMXNSl THZI AVTCKATXCALLY Ml... 

Save changes to D ORCAD PSMAN CIRCUIT FILES SECTION 8A.stl ... 

Several parts have been created for Oread Capture to make this text easier for students to use. In order to have your circuits look like those shown in this manual, you must install the libraries specific to this text. This section shows how to install those libraries. This installation will do two things (1) It will install the parts libraries used in this text. (2) It will copy all circuit files used as examples in this text onto your hard disk so that you can look at and run the example files. The libraries will be copied to the standard library subdirectory. The circuit files will be copied to a directory named Book Circuits in the installation directory. 

Note that you may need to restart your computer in order to use the circuit files installed for this book. 

The library installation program copies all of the circuit files used as examples in the book to your hard drive. The files are placed in a directory named Book Circuits in the directory you specified for installation. 

Disadvantages Not a true missing pulse detection circuit, actually a timer circuit File names 555 mpd (IsSpice), 555 mpd2 (PSpice), 555.mpd3 (Micro-Cap)... 

Patent laws provide for several stages in the life of an application for a patent on an invention. The pattern followed by patent laws in effect in most industrialized countries during the nineteenth and early twentieth centuries, and still in effect in the United States in 1995, calls for the examination of all patent appHcations to certify that the claimed invention meets the national standards for novelty, usehilness, and inventiveness. The owner of the technology to be patented files appHcation papers that include a specification containing a description of the invention to be patented (called the disclosure) and claims defining the limits of the invention to be protected by the patent, a formal request for the issuance of a patent, and fees. Drawings of devices and apparatuses, electrical circuits, flow charts, etc, are an important part of the disclosures of most nonchemical and many chemical patents. 

The installer engaged by the furniture supplier did a truly professional job. It was finished sooner than expected. There was some fear that the monolithic countertop slabs, which were pre-fabri-cated at the factory, might have size discrepancies. They did not, due to very careful measurements taken when the order was placed. The plumbing contractor chosen by the engineering firm did excellent work. The electrical contractor was pleased with the way circuits had been planned, and the planner in turn was highly satisfied with his installation. At the laboratory operator s request, all information regarding installation and maintenance was saved and later filed. The contractors admitted that this was not their common practice, but they were all in favor of it. 

DBACKUP CDCDROM CD Circuits II CD DELL CDDRVUB CD inetpub CD Multimedia Files... 

When you are finished with your circuit, select File and then Save from the Capture menus. This will save the changes to this page only ... 

Select Open. We will assume that you installed Capture on drive C in directory Program FilesXOrcadLite. (This was the default installation location.) For this installation directory the example circuits will be located in directory C Program Files OrcadLiteVBook Circuits. First, select the directory named C Program FilesNOrcadLiteVBook Circuits ... 

After you select the directory BOOH Circuits, a dialog window will display the files in that directory ... 

We will use the circuit named Section 2.opj. Open this file ... 

We used this circuit at the beginning of the chapter. Follow the instructions on pages 93-94 to open the file. If you saved changes to file Section 2.opj earlier, your Probe screen may display some waveforms when Probe starts. 

Select the option to create a blank project and click the OK button. We can now draw our circuit. I will create a simple circuit and then set up and run a simulation. I am simulating the circuit so that you can see all of the files created for a project. My circuit is shown below ... 

This selection specifies that only the Bias Point simulation will run. We do not need to specify any output file options because we will be displaying the results on the schematic. Click the OK button to save the simulation profile and return to the circuit. 

SOLUTIOR Set up a Bias Point analysis and then simulate the circuit. The results can be viewed on the schematic or in the output file ... 

Note for this example If you use file Section 3C.opj from the CD-ROM or from the files copied from the CD-ROM to your hard drive during installation, you may have problems with the libraries during the simulation. For this example, you should draw the circuit from scratch and not use the provided example files. 

For a BJT, the Bias Point Detail gives the collector current, the collector-emitter voltage, and some small-signal parameters for the BJT at the bias point. For a jFET, the Bias Point Detail gives the drain current, the drain-source voltage, and some small-signal model parameters at the bias point. The results of the Bias Point Detail are contained in the output file. We will illustrate the Bias Point Detail analysis with the circuit below ... 

These results show several parameters for the BJT. In particular Ic is 18.2 mA and Vce is 3.14 volts. Had there been more than one BJT in the circuit, the operating point information would be displayed for all BJTs. Similar information is shown for MOSFET, jFETs, and other three-terminal devices. To close the Text Editor program select File and then Close from the menus ... 

Convergence problems have been observed in some transient simulations of circuits with switches, such as the circuit on page 334. You will notice this error because the transient simulation terminates prematurely. If you look at the output file, an error message near the end of the file will indicate a convergence problem. The problem can be fixed by choosing a smaller value of Maximum Step Size, or by using one of the methods mentioned in Section 6.A.3. 

Since this simulation will run for a long time and we have specified a small Maximum Step Size, a lot of data will be collected. PSpice normally collects voltage data at every node and current data through every circuit component This results in a large Probe data file that can take a long time to load and may cause memory problems. Since we are interested only in the input and output voltages, we will tell PSpice to collect data only at the input and output nodes, which will be marked with markers. 

The waveform information will be saved in file SECTION 6MStl. If you copy this circuit to a floppy, make sure you copy the files SECTION 6/W.opj and SECTION 6Mstl. If you do not copy the file SECTION 6MStl, you will lose the waveform information when you copy the files to a floppy disk. 

Suppose you have created a number of new models and you would like to use them in another circuit. This can be done by adding the library name to the library path. The current project we are using is SECTION 7A.opj. The new models created in this circuit are stored in the file called SECTION 7A.lib. Use the Windows Notepad program to edit the Hie SECTION 7AM. 

In this section we will show how to take a schematic and change it into a subcircuit so that you can use it with other circuits. In order to follow this section you must have access to the libraries and configuration files for Capture. If you are running Capture on a network, you may not have access to these files. If you are running this example on your own computer, you should be able to follow the example with no problems. 

We are now ready to create the subcircuit netlist for this circuit. Select File and then Save to save the circuit, and then select File and then Close to close the window. You should return to the project tree for this circuit. Expand all the branches of the tree ... 

This netlist describes the circuit we created in Capture. Since we chose to create a subcircuit netlist, the second line of the file declares the netlist as a subcircuit. The name of the subcircuit is MEHjOpAlTip, or whatever you named your subcircuit, and the calling nodes are Vm, V0, and Vp. These node names were derived from the ports we added to the circuit. The order is not important because we will have Capture create the symbol for this subcircuit, and it will use the same nodes in the correct order. 

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