Liren Large Software Subsidy 13

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1.0) Introduction This file describes the enhancements and changes included in the 4.05 release of PSpice. For information regarding installation, operation, and technical details about the package, you may purchase the Circuit Analysis User's Guide for $50.00. 2.0) Updates and Corrections to the User's Guide All manual modifications for this version have been marked by shading those items, with the exception of the "Digital Simulation" chapter. The "Digital Simulation" chapter has been rewritten, giving a more detailed explanation of the use of our mixed mode feature. Example Circuits (all platforms) The Circuit Analysis User's Guide discusses EXAMPLE1.CIR and DIGITAL.CIR as being the example circuit files included with the package. The evaluation version has two different example files, EVAL.CIR and EVALOSC.CIR. EVAL.CIR is similar to DIGITAL.CIR, illustrating many aspects of our PSpice circuit simulator with both analog and digital components. EVALOSC.CIR is a mixed analog/digital ring oscillator circuit. Library File (all platforms) The library file included with the Circuit Analysis evaluation package is EVAL.LIB. EVAL.LIB contains 28 components of various types. (The production version of the PSpice program comes with NOM.LIB which has over 3,500 analog and 1,500 digital parts.) To use EVAL.LIB, or any library with parts you have generated yourself, you need to include a .LIB statement in your circuit file. The .LIB statement will not assume EVAL.LIB, therefore if you do desire to use EVAL.LIB, you must include the statement as follows: .LIB EVAL.LIB Note: See EVAL.CIR and EVALOSC.CIR for an example. PSPICE 1. The delta and Vmax parameters in the Level 2 and 3 formulas for the GaAsFET model are now user-definable. The parameter names are Vdelta and Vmax. Vdelta is the capacitance transition voltage with a default of 0.2, and Vmax is the capacitance limiting voltage with a default of 0.5. PROBE 1. The Probe Label function may be used in any analog plot with a defined Y axis, even though the User's Guide implies that labels may only be placed in plots containing traces. This may be done by either adding a trace or using Set_range under Y_Axis. 2. User-definable colors are available for Probe, Parts, and StmEd, not PSpice. 3. The following is only for the use of user-definable colors for platforms with the X Window System. The colormix program assumes that your X server is capable of displaying 20 different colors simultaneously at the time the program is invoked. There may be times when this is not possible--your X server may not be capable of displaying that many colors, or other programs running may not be allocating shareable colors thus there are not enough colors left to allocate the 20 required. The colormix program provides the following options to reduce the number of required colors. usage: colormix [-options...] options include: -n# Where 4 <= # <= 15 -m Minimizes extraneous colors Invoking colormix with -m causes the colormix slide bars to be white instead of red, green, and blue for a savings of three colors. You may further reduce the number of colors required by using the -n option to specify how may colors may be modified. Thus "colormix -m -n4" allocates 6 colors: black, white, and the four modifiable colors Foreground, Background, Cursor, and Trace #1. This is the minimum configuration available. DIGITAL SIMULATION 1. Version 4.05 of PSpice has important new features for Digital Simulation. Unfortunately, because of these new features, digital circuit and library files from older versions of PSpice are not compatible with PSpice 4.05. A conversion program, DIGCONV, is included with this update to convert old circuit and library files to the new format. You should back up all of your old circuit and non-MicroSim libraries before you install PSpice 4.05, just in case you need to go back to an earlier version of PSpice. The change in PSpice which creates the incompatibility is the addition of power supply nodes on all digital primitive devices. These additional nodes must be added to all digital primitive devices (these start with the letter "U"). The power supply nodes are always the first two nodes. All of the new MicroSim digital library subcircuits include these power supply pins as optional subcircuit pins, so circuits which use MicroSim libraries and no "U" devices will not have to change. For more information, refer to the Digital Simulation option information sheet packaged with this release. STIMULUS EDITOR 1. The Other_info menu now has the item io_Level, allowing you to modify this parameter. This is an optional device parameter which selects one of the four AtoD or DtoA interface subcircuits from the device's I/O Model. PSpice calls the selected subcircuit automatically in the event a node connecting to the primitive also connects to an analog device. If not specified, io_Level defaults to 0. Valid values are: 0 = the current value of .OPTIONS DIGIOLVL (default=1) 1 = AtoD1/DtoA1 2 = AtoD2/DtoA2 3 = AtoD3/DtoA3 4 = AtoD4/DtoA4 DEVICE EQUATIONS (DOS platform) 1. The User's Guide states that you must use the Plink86plus (version 2.24) linker, from Sage Corporation, for the DOS platform. You can also use the Microsoft linker, but an AC analysis will be very slow and the printing of the AC analysis output will be slow as well. Another drawback is that the Microsoft linker may produce an executable file that is substantially larger than one generated by Plink86plus. If you decide to use the Microsoft linker, link with the command: LINK @PSPICE.LNK DECstation platform 1. PSpice version 4.05 requires the use of ULTRIX 4.0 or greater. 3.0) Program modifications since version 4.04. PSPICE 1. A network license is now available for the Sun. 2. A limiting algorithm has been added to evaluate expressions. 3. The .SAVEBIAS and .LOADBIAS statements have been added. 4. In the .NODESET and .IC statements, the voltage between two nodes may now be specified. 5. The .WATCH statement has been added. Up to 3 voltages or currents can be displayed during a simulation. You can also have the program pause if they reach a specified value. 6. Commands can now use quotation marks around all filenames, allowing for embedded blanks or special characters. 7. PWM (voltage modes) models are now available in the library. 8. The DOS and DOS/16M versions of PSpice can run in all three modes of Windows 3.0: real, standard, and enhanced. 9. There are some .model and .subckt changes to allow object- oriented model library capabilities. PROBE 1. Probe labels, lines, arrows, boxes, circles, etc., for hard copy have been added. 2. The default number of trace colors for both EGA and VGA displays has been increased from 4 to 6, but up to 12 colors can be user defined. All colors are made bright. Traces overwrite one another, i.e., trace colors do not mix when they overlap. The last drawn trace is the color that shows at a trace overlap. 3. User-definable colors can be set for the background, foreground, mouse cursor, and traces. 4. The display of rising and falling states has been added for digital plots. 5. A new string edit capability has been added, <Shift> <Backspace>, which deletes a string from the first character to the cursor minus one character, and keeps the string from the cursor to the last character. 6. There is a new hard copy device called TABLE, which creates a table of X and Y values that can be used as input to other programs (i.e., word processors, graphics programs, etc.). <port name> should be set to FILE in the PSPICE.DEV file. 7. Plots may be selected directly with the mouse. 8. The addition of goal function search commands has been added to Cursor Control. 9. A Pan function has been added for Zoom. Pan allows you to examine different portions of the traces by using the arrow keys or the mouse. Each time an arrow key is pressed, the display pans by 10% in that direction. The mouse button can be pressed with the mouse positioned in the area of the screen showing the direction to pan (i.e., the mouse positioned in the top portion of the screen, will cause the display to pan up). 10. Improved symbol control has been implemented. 11. PSpice data points can now be displayed on traces. 12. The Zoom function has been added for digital plots. Zoom provides a quick and simple, visual way to change the x range (that is, to zoom the display in or out). 13. Probe macros no longer require parentheses if there isn't an argument. 14. The x-axis now has a menu item, Unrestrict_data, which resets the restriction on the x-axis data set by Restrict_data. 15. The auto-update default interval has been changed from 30 seconds to 10 seconds. 16. The HP DeskJet and QuietJet printers are now supported. 17. The Epson LQ printers are now supported in both the high and low resolution modes. 18. The internal buffer used by the hard copy function has been increased to improve printing speed. 19. A timeout problem associated with the HP7475 plotter has been fixed. PARTS 1. Parts sessions can be frozen to be rerun at a later time. Every time a model file is written to disk, the session information is saved to a file. The name of the file is the device name with a .MDT extension. If the same device name is given in a later Parts session, the data found in the .MDT file will automatically be read in. DIGITAL SIMULATION 1. The number of states for digital simulation has increased from 28 to 246,528. This is due to the increase in the number of input levels from 3 to 5, which includes the rising and falling states. Output strengths have also been increased from 4 to 64. 2. Digital power supply pins have been added to all digital primitive devices. They are always the first two nodes in the node list. Pre-4.05 circuit and library files, which contain digital primitive ("U") devices, will not be compatible with version 4.05 and will need to be converted with the DIGCONV program. For more information, refer to the Digital Simulation option information sheet packaged with this release. 3. Optional power supply pins have been added to all of the parts in the digital library. This gives you the capability to specify more than one power supply in your circuit. Now you can use your own power supply instead of or in addition to the default 5.0-volt supply used by the AtoD and DtoA interface subcircuits which are automatically inserted by PSpice. 4. CD4000 series digital library models now work with variable power supply voltages (3-18 volt). 5. AC and ACT family of devices have been added to the digital library.