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NI Multisim:高级交互式仿真与SPICE分析 NI Multisim: Advanced Interactive Simulation & SPICE Analyses
Overview National Instruments Multisim is a powerful and intuitive simulation tool that enables designers to reduce design iterations and save valuable time and money. To drive efficiency for electronics design, Multisim includes a wide variety of sophisticated simulation tools for the professional designer: a robust industry-standard SPICE engine, dozens of advanced analyses, customizable simulation options, custom component creation, and integration with industry standard test and measurement tools. In the following article, you will learn about each of these areas and how they can be applied to your design process.
Industry Standard SPICE Simulator Multisim gives you the advantages of SPICE without requiring that you know low-level simulation details. You can quickly and interactively conduct SPICE simulation with the click of a mouse using Multisim virtual instruments, which are simulated bench-top instruments that will connect to your schematics and report simulation results through familiar interfaces such as an oscilloscope or spectrum analyzer. As you become more familiar with the concepts and details of simulation you can gradually ease your way into much more advanced applications. Multisim incorporates industry-standard SPICE versions 3F5 and XSPICE at the core of its simulation engine, with customized enhancements to optimize simulation performance and improvements for convergence. SPICE 3F5 is the most recent edition of the SPICE core designed by the University of California at Berkeley. XSPICE includes a set of powerful extensions made to SPICE under contract to the US Air Force, which includes event-driven mixed mode simulation and an end-user extensible modeling subsystem. In addition to the powerful core simulation capabilities, patented co-simulation technology enables Multisim to simulate VHDL and MCU components alongside analog and mixed-mode circuits. When simulating with Multisim you are taking advantage of over thirty years of incremental SPICE improvements, as well as a host of other benefits.
Advanced Analyses Multisim simplifies the procedure for an advanced analysis by providing a configuration wizard. This wizard simplifies the normally complex syntax associated with configuring an analysis such as Monte Carlo. Once the desired analysis is chosen, you need only specify the associated parameter values and output nodes - Multisim conducts the simulation and outputs results to the customizable Grapher.
Customizable SPICE Simulation Options: Simulation Speed versus Accuracy The tradeoff between speed and accuracy is evident in many of the SPICE simulation parameters. For example, the RELTOL (relative tolerance) parameter is used when SPICE solves DC and transient analyses using its iterative algorithm. Consecutive iterations of the algorithm produce an increasingly accurate solution. When two consecutive solutions are within a value calculated from the RELTOL parameter value, then the simulation has converged and results are presented. By having a very small RELTOL, simulations may take longer but can provide more accurate results. Multisim provides a simulation advisor to help you choose appropriate values for the many simulation parameters. The advisor also helps you to tweak parameters in order to remedy simulation problems such as those mentioned above. You can learn more about simulation options by examining the SPICE user's guide. National Instruments provides links to the SPICE user's guide as well as other fundamental SPICE topics at the SPICE Simulation Fundamentals Page. Another invaluable resource for understanding SPICE simulation and options is The SPICE Book, by Andrei Vladimirescu (ISBN 0-471-60926-9, www.wiley.com).
Customizing Components You can easily edit the properties of components by double-clicking on them. When editing a part, you can customize all properties, such as the symbol, electronic parameters, user fields, simulation model, and layout footprint. Should you desire to modify the SPICE model for a component, you can consult the SPICE user's guide or look in the Multisim help file for a detailed explanation of the meanings of the various SPICE model parameters. After your modifications are made, you can save the customized part to a personalized user database and share it with others in a corporate database stored on a network disk. You can also create custom components to model specific devices, effects, or to account for real-world non-idealities that occur under specific circumstances. The easy-to-use component wizard guides you through the process of defining parts for placement, simulation, and PCB layout. The wizard guides you through the creation process in which you can specify as much or as little information as needed for your application and the part's intended use. You can download SPICE models from a variety of online resources, including vendors, and assign them to your own components in this wizard. You can view a tutorial on this topic: Creating a Custom Component in NI Multisim Part manufacturers and chip vendors are an excellent resource for SPICE or other simulation models for components. However, there are often cases where no model is available. In order to streamline the process of component creation Multisim includes 24 model makers that will automatically generate a SPICE model for you based on the datasheet parameters for that component. Simply launch the model maker and specify parameters values and a SPICE model will be generated. For a list of model makers, consult Appendix B.
Integration with Industry Standard Test & Measurement Tools: labview and Signal Express You can place LabVIEW-based custom virtual instruments on your schematic diagrams in Multisim that interactively measure real-world signals and input them to simulations. This means that Multisim can simulate the circuit's response to real data to produce results that will more closely match a prototype's actual behavior. You even have the ability, with native file sharing and custom virtual instruments, to send the outputs of your simulation to the real world. With this methodology you can essentially create a virtual prototype to see how your circuit will interact with other system-components in the real world long before prototypes are manufactured. By delaying costly prototypes until later in the design cycle, you can uncover and remedy design errors early-on in the process, minimizing the amount of costly and time-consuming rework done to prototypes. Once a prototype is created, you typically verify and validate its operation through physical measurements. To ensure correct operation the measurement results are compared to simulations. Multisim can output simulation data to a standard LabVIEW Measurement File which is read easily by both LabVIEW and SignalExpress.
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