As operating frequencies reach 1GHz and beyond noise introduced from the interconnect and power distribution system must accurately be accounted for in both PCB and IC design. Such noise can destroy timing budgets and cause functional failures. Simulation of these Signal Integrity issues has become a necessity.

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Supported Technologies Operating Systems:Windows XP/2000/NT , HP/UX, Solaris/Sun OS
Based Upon:- Unspecified -
Sales phone:408-436-9070x106

Additional Product Information

     ApsimFDTD-SPICE is the first full wave electromagnetic field solver fully integrated with a non-linear circuit simulator. ApsimFDTD-SPICE combines a Finite Difference Time Domain 3D field solution with the industry standard non linear circuit simulator SPICE. The simulator is targeted for designs operating above 1GHz but is applicable at any frequency. The solution is the most accurate for electromagnetic problems with non-linear devices. It is ideal for digital high speed designs where clock timing and accurate delays are crucial.
    Traditional SI simulation tools start to become inaccurate at very high speeds due to high frequency effects such as dispersion, dielectric loss, skin effects and non-TEM modes. Such SI tools assume perfect power and ground planes. The planes in a high speed application are where the return currents are found. Perforations due to vias, slits or cuts and other imperfections greatly affect these return currents and therefore the signal quality. 3D full wave solvers do a good job of modeling these effects but are only applicable and accurate for linear circuits. Using 3D full wave techniques, circuit equivalent elements are first derived from S parameters and then simulated separately by a non-linear circuit simulator.
    ApsimFDTD-SPICE solves the problem set in the time domain. At every time step information is passed back and forth between the field solution and the non-linear simulator. The result is the most accurate solution for Maxwell?s equations and non-linear circuits. ApsimFDTD-SPICE can handle SPICE transistor level or IBIS models. All standard SPICE and ApsimSPICE elements are supported. ApsimFDTD-SPICE is applicable for both PCB and IC designs.
    The physical structure can be input by use of ApsimPGEDIT. ApsimPGEDIT is a graphical tool used to enter, import and edit the physical structure. ApsimPGEDIT can import from popular CAD software, DXF formats or TIFF files. The FDTD ports are defined and then brought into the SPICE net list as special elements. The rest of the non-linear circuit is described in SPICE. The outputs from ApsimFDTD-SPICE include time domain voltages, currents and other SPICE output formats. Time domain 3D field plots and S parameters are output by the simulator.
    The approach used in ApsimFDTD-SPICE allows tough electromagnetic problems to be solved with real world component models for a accurate solution over a wide range of the frequency spectrum not possible before.

Contact Information: Applied Simulation Technology
1641 N. First Street, Suite 170
San Jose, CA. 95112
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