editor's blog
Subscribe Now

High-Sigma Simulations

We’ve noted before that the meaning of “corners” is much less obvious for analog circuits than it is for digital. Solido noted in a recent announcement that memory design in particular highlights the challenge. Memories are built of analog circuits that are repeated numerous times, and getting them all to yield on aggressive processes with enormous variation is a tough job.

They say that the standard Monte Carlo “run enough samples to cover the space, and then interpolate the gaps” approach has become untenable because of the number of samples that must be taken – billions – to capture a process with enough fidelity to capture problem areas. You can go with fewer points to simulate, but you may interpolate or extrapolate incorrectly – drastically so in some cases. In particular, if you’re trying for a high-sigma design, it’s unlikely that you’ll adequately check out the tails of the process.

So Solido has announced an enhanced form of meta-simulation: it’s a way they have of analyzing the sample set to determine which points to simulate rather than simulating them all. They claim they can run a 5-billion-sample set in as little 15 minutes. They claim no loss of confidence in the result as compared to running all 5 billion simulations.

You can find more information and a link to some whitepapers in their release

Leave a Reply

featured blogs
Dec 12, 2018
For years chip designers have dealt with ECO'€™s when their source code was written in RTL. But the move to high-level synthesis (HLS) means that their source code is now one step further removed from... [[ Click on the title to access the full blog on the Cadence Communit...
Dec 12, 2018
A joint demonstration between Samtec and eSilicon — an eSilicon 7 nm 56 Gbps DSP SerDes over a Samtec 5 meter ExaMAX® backplane cable assembly — caught a lot of attention at SC18. The demo showed a true long-reach capability with a high-performance, flexible, eas...
Dec 10, 2018
We may think of prosthetics as devices created to enable basic functions, such as walking or grasping an object. Regarded as a necessity, but not an asset, prosthetics of the past......
Nov 14, 2018
  People of a certain age, who mindfully lived through the early microcomputer revolution during the first half of the 1970s, know about Bill Godbout. He was that guy who sent out crudely photocopied parts catalogs for all kinds of electronic components, sold from a Quon...