John Kulusich, Wai Yan Ho

John Kulusich, VP Business Development
Wai Yan Ho, CEO/President (ECAD, ASIC, Microprocessor,Epic, DRC/LVS, invested in EDA companies, ASPECT)

When I marketed a Fast SPICE circuit simulator I knew that trying to simulate a power or ground network with millions of RC elements would just swamp my tool, so we always told the users to run the built-in RC reduction to get a reasonable number of elements to simulate.

The team at GRID Sim Tech now has a very clever way to keep all of those RC elements in your power and ground networks then create a macro-model for use in any SPICE or Fast SPICE circuit simulator.

With this new approach you can now use your trusted SPICE tool (HSPICE, Spectre, Eldo, etc.) with the macro-model from GRID Sim to do IR drop analysis and Electro-migration (EM) analysis.

Who wants this accuracy? Mostly IC designers at the bleeding edge of 28nm, full-custom and sensitive analog designers.

Another question, how do I know that the IR or EM simulation results are correct?

Answer, run the SIMCheck tool from GRID Sim.

From a marketing perspective I like how this new tool lets me use my existing circuit simulator to do IR and EM analysis in a way that I couldn’t do before. Look for customer announcements this year.

Shorthand Notes
Goals – billions of RLC elements without any reduction , hierarchical Parallel Distributed Architecture (HPDA)
-    Network is just Ethernet,
-    Linear circuit modeling on a large scale
-    Ability to partition the power grid, distribute the work across multiple computers, then recombine for accuracy
-    Infer hierarchy in the flat netlist
-    Stealth mode at customers for about one year
-    Handle mutual inductors
-    Prefer RLC for transient analysis instead of S parameters
-    Design flow: extract RLC netlist, GRID tool restructures the netlist, GRID simulator creates a macromodel (hierarchical, canonical)
-    How to verify IR drop simulation results? SIMCheck used Kirchoff’s Current Law, Kirchoff’s Voltage Law and Power Conservation. SIMCheck tells you how accurate your simulator is for (netlist and nodal values) IR drop analysis.
-    Macromodels work with any SPICE or Fast SPICE tool
-    SIMCheck shows you any variance on results
-    Customer endorsements soon in 2010
-    Electromigration is the next step.
-    Simulation variance and it’s impact on the design cycle for Power (IR EM)
-    NanoRAIL – creates macromodel
-    Could be: Joint Development, product, etc.
-    Uses: 3d interconnect
-    1 billion RLC elements, create macromodel in 32GB of RAM, 500GM hard disk
-    Because the macromodel is created quickly you can vary and do what if analysis
-    Coming Soon: 2d/3d viewer
-    All nodes visible
-    Accurate modeling