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- #How to add parameters in pspice schematics 64 Bit#
- #How to add parameters in pspice schematics code#
- #How to add parameters in pspice schematics license#
- #How to add parameters in pspice schematics simulator#
- #How to add parameters in pspice schematics free#
A 53 bit binary significand gives LTspice about 16 significant figures for internal math computations. However, because of the 52 bit precision of the fractional part of the significand, the practical numerical dynamic range will be circuit dependent. Values exceeding this range are interpreted as ± infinity or as zero.
#How to add parameters in pspice schematics 64 Bit#
LTspice generally represents numbers using 64 bit double precision arithmetic with the following data structure:įor general component values LTspice will accept numbers that range in magnitude from as large as ± 1.798 x 10 +308 down to as small as ± 2.225 x 10 −308.
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For these reasons, this last category of undocumented features will not be directly discussed here.
#How to add parameters in pspice schematics simulator#
Just as clearly, any undocumented A-device that is specific to LTC’s encrypted, high performance SMPS IC models would likely be considered proprietary knowledge to be protected with due diligence from release to the public domain, lest LTC’s competitors gain the de facto permission to freely copy them in their own circuit simulator offerings (however, it is difficult to see how LTC could legitimately prevent private individuals from making use of such undocumented features in their own simulations or discussing them via private communications). A lot of the standard devices have undocumented parameters (e.g., tempcos) or syntax (e.g., Pspice specific compatibility) that would fall into this category. Clearly any standard, generic SPICE feature that works in LTspice would be okay for general use and discussion regardless of its state of documentation in LTspice.
#How to add parameters in pspice schematics code#
However, be advised that any items that have been dropped from the documentation, even if still functional, should generally be considered obsolete and in risk of being purged from the program code at any time (fortunately, such items are quite rare).Īs to the classification of anything not covered above, you must make your own common sense judgment or ask the advice of the users group moderator or the program author via private email. Such items are all considered as having been officially " documented" and are specifically allowed as discussion topics in public forums such as the LTspice Yahoo users group. " Fair game" is any feature that is or has ever been part of the normal distribution, i.e., appears or ever has appeared in the Help file, as plain text in any of the included sample or example files, in any program menu available during normal use of the program, or in any of the materials, presentation files or handouts from any LTspice seminar presentation.
#How to add parameters in pspice schematics license#
LTC considers some of these undocumented features as fair game for open discussion in public forums such as the LTspice Yahoo users group, whereas for others, it considers any such open discussions as a violation of its License Agreement. The purpose of this topic is to explore and explain some of the many useful or quirky features that have never appeared in the standard documentation whether due to simple oversight, the feature being considered not important enough, not polished enough or functionally obsolete – or even due to the feature being considered proprietary to another brand of SPICE or to LTspice itself. Because of its superior performance, excellent community support and ease of file sharing, it is rapidly replacing all other SPICE programs, regardless of price, as the simulator of choice for hobbyists, students and professionals alike.
#How to add parameters in pspice schematics free#
LTspice/SwitcherCAD III is a complete and fully functional SPICE program (electronic circuit simulator) that is available free of charge from the Linear Technology Corporation (LTC). Please submit your requests for additions or changes to Undocumented LTspice on the "discussion" page (second tab above).
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9.6.1 Placing the Linear Technology or Analog Devices logos within a Symbol.9.5.3 Bussing of Connections and Components (BUS shorthand notation).9.5.2.3 Creating a Label when doing another Simulations.9.5.2.2 Creating a Label when doing a.9.5.2 Operating Point Data Labels (visible numeric dc bias values).7.6.4 Resistor (and Capacitor) Model Statements.7.6.3 Dual Value Resistors (for ac analysis).7.6.2 Behavioral Resistor & Power Sink/Source.7.3 VDMOS: Breakdown, Sub-threshold Enhancements.7.2 BJTs: Additional Gummel-Poon Parameters.