TopSPICE is still the price/performance leader in true analog/digital/behavioral mixed-mode simulation for the PC. It offers the most advanced simulator in its price range, compatibility, and a quick and easy to use integrated design environment from schematic capture to graphical waveform analysis.

TopSPICE is a native full-featured mixed-mode mixed-signal circuit simulator capable of simulating circuits containing any arbitrary combination of analog devices, digital functions and high-level behavioral blocks. With TopSPICE you can verify and optimize your design from the system to the transistor level. By using the built-in logic simulator to simulate the digital sections of your circuit instead of analog equivalents, mixed-mode simulation times can be reduced by orders of magnitude.

Product Highlights

• Native mixed-mode mixed-signal simulation
• Industry compatible SPICE simulator works with most PSpice(tm) and HSPICE(tm) netlists, and vendor SPICE model libraries
• Built-in event-driven logic simulator
• 32-bit simulator supports large circuit sizes (up to available system memory)
• Built-in device models: diode, BJT, MOSFET (Levels 1, 2, 3, 81 & 491), JFET, GaAs FET, MESFET, nonlinear magnetic core, ferroelectric capacitor, switch and digital primitives
• Extensive model libraries of analog and digital components
• Analog behavioral modeling
• Analyses: bias point, DC sweep, transient, AC sweep, noise, distortion, sensitivity, transfer function, Fourier, temperature, Monte Carlo, parametric stepping
• Interactive graphical post-processor with "auto plot"
• Waveform expression plots
• Powerful waveform analysis functions
• All design and simulation functions are available from either the schematic or netlist editor front-ends

Integrated Design Environment

TopSPICE offers a fully integrated environment to capture, simulate, and analyze your circuit designs. Its flexible architecture allows the designer to integrate all the design tools, including third party tools and model libraries, into a complete EDA system.

Native mixed-mode simulation

SPICE has become the de facto industry standard for analog circuit simulation. It offers the advantages of a large user base, large number of existing device models, modeling support by component manufacturers, and compatibility between CAD vendors. However, SPICE is an analog only simulation technology. State-of-art mixed technology circuit designs require a hierarchical top-down design environment with a circuit simulator capable of handling different levels of abstraction simultaneously.

TopSPICE implements a fully integrated mixed-mode simulation technology. The analog electrical simulation and the logic simulation algorithms are merged into a single simulator architecture. Both algorithms operate under a single event schedular to most efficiently solve time advancement, backup, signal conversion and convergence issues in mixed-mode simulation. The logic simulator implemented in TopSPICE is fully event-driven. The digital section of the circuit is only evaluated when a logic event takes place during the simulation. Since logic simulation is most efficiently handled in terms of discrete time steps, TopSPICE uses independent time steps for simulating the analog and digital sections of the circuit. TopSPICE also implements a common SPICE like input syntax for both analog and digital sections for getting those designers familiar with SPICE rapidly on board.

Advanced Features

• Macromodeling with parameter passing
• Automatic library search
• User defined parameters
• GMIN and source stepping algorithms solve tough convergence problems
• Monte Carlo analysis allows device and lot tolerances
• Built-in advanced ferroelectric capacitor mode
• Jiles-Atherton nonlinear magnetic core mode
• BSIM3 v32 deep submicron MOSFET model
• Linear system frequency domain modeling using arbitrary Laplace transform functions
• Enhanced K element allows unlimited number of coupled inductors
• PRINT output supports device currents, source impedances, magnetic flux and digital states
• Binary output option saves all voltages, device currents and digital node states
• Complex AC waveform expression support
• FFT, histogram and Smith chart plots

System Requirements:

IBM AT/PS2 with 80486 or higher CPU • 8MB RAM, hard disk drive (20MB free) • CD-ROM • Windows 95, 98 or NT.