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Simulators >> Circuit Simulators >> How to set gear or trapzoid in Spectre/ADE
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Message started by ywguo on Apr 23^rd, 2007, 8:56pm

Title: How to set gear or trapzoid in Spectre/ADE
Post by ywguo on Apr 23^rd, 2007, 8:56pm

Hi, Guys,

How to set gear or trapzoid in ADE using SpectreD simulator?

Thanks
Yawei

Title: Re: How to set gear or trapzoid in Spectre/ADE
Post by ywguo on Apr 23^rd, 2007, 11:36pm

In Virtuoso Spectre Circuit Simulator Rleference, there are integration method parameters and envelope integration method parameters. There possible values are the same, including euler, trap, traponly, gear2, gear2only, or trapgear2. What's the difference between integration method and envelope integration method?

Thanks
Yawei

Title: Re: How to set gear or trapzoid in Spectre/ADE
Post by Andrew Beckett on Apr 30^th, 2007, 5:34am

To answer your first posting in this thread, hit the "Options" form at the bottom of the relevant analysis (e.g. tran, pss, qpss, envlp) and find the "method" parameter and set it to gear2only or traponly. There are some other options, but these are not commonly used. See Ken's book for more details - or read the manual.

For the second question, the envmethod allows you to control the integration method for the curve used to fit the envelope points - it is a similar integration method which allows control over spacing of the envelope sample points (where each sample point is effectively a cycle; within the cycle, method controls the integration method used for timestep control).

So envmethod controls the envelope, method controls timestep.

Regards,

Andrew.