The Designer's Guide Community Forum

The Designer's Guide Community Forum
https://designers-guide.org/forum/YaBB.pl
Design >> Mixed-Signal Design >> Substrate Noise Analysis
https://designers-guide.org/forum/YaBB.pl?num=1106248047

Message started by mohammad on Jan 20^th, 2005, 11:07am

Title: Substrate Noise Analysis
Post by mohammad on Jan 20^th, 2005, 11:07am

Hi,
Does anyone know what is the best software tool for simulating substrate noise effects? Simplex used to offer SubstrateStorm and CADMOS offered SeismIC but both of them were acquired by Cadence and it seems that Cadence have integrated both in Substrate Noise Analyst. But there are only a few documentations on it and I think they have just put them together without actually connecting them to each other.

Any comments on how to simulate substrate noise at Spice level is also appreciated. I have seen several papers suggesting small lumped element networks but it seems that they work only for small circuits.

Thanks.

M.H.

Title: Re: Substrate Noise Analysis
Post by jfosorio on May 13^th, 2005, 1:39am

Hello,
I currentrly use Substrate storm and I have evaluated SeismIC. You are alright they were "integrated" in SNA, although I dont know any big change in substratestorm that is the software I use most.
I think that they differ in the algorith they use to modelate the subtrate. When I have evaluated SeismIC in the tutorial It surpise me a lot that you only have to describe the subsrtate doping leval, while in substratestorm you describe the a detailed substrate profile. Then the models extracted by substratestorm are more detailed (this means a large number of Rs and Cs) . I think this is the reson substratestorm is prefered by circuits with few transistors and RF applications. However I have simulated "large" circucits with thousand of transistors using the macro capability of SS, Basically It assumes that in a selected area the substrate below is a single node, that is almost always true for Heavly Doped substrates with enogh substrate contacts but it should be used with care in Lighly doped substrates.
bye