Re: Digest for electricvlsi@googlegroups.com - 2 updates in 1 topic

[Alexandre Rusev]

When I write SPICE deck from schematics I see only W, H

As I understand for calculating for example area source and perimeter (AS,AD) the SPICE writer needs to know

geometry of transistor or presume some default geometry.

Out analog designers used to set up AS=.. AD=... with formulas calculating them from W,H and their particular MOSFET geometry.

(they are often using ring transistors in 180nm tech)

Okay, if Electic is able to calculate these additional parameters in some cases, then guess it must be using extraction from layout

to extimate areas and perimeters, am I right?

On Wed, Oct 23, 2019 at 9:30 AM <electr...@googlegroups.com> wrote:

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• How to add params AS=.. PS=... to mosfet??? - 2 Updates

How to add params AS=.. PS=... to mosfet???

Alexandre Rusev <cybe...@gmail.com>: Oct 23 12:45AM +0300 Hello all!   What is a regular way to add additional parameters to MOSFET in schematic view? I need PD=... AD=... (perimeter of drain, area of drain and others due to insera them to SPICE model) likes in screenshot of S-edit       Could anybody point me to the place in Electric manual to read about this         Confidential C   -- Disclaimer ------------------------------------ Ce message ainsi que les eventuelles pieces jointes constituent une correspondance privee et confidentielle a l'attention exclusive du destinataire designe ci-dessus. Si vous n'etes pas le destinataire du present message ou une personne susceptible de pouvoir le lui delivrer, il vous est signifie que toute divulgation, distribution ou copie de cette transmission est strictement interdite. Si vous avez recu ce message par erreur, nous vous remercions d'en informer l'expediteur par telephone ou de lui retourner le present message, puis d'effacer immediatement ce message de votre systeme.   *** This e-mail and any attachments is a confidential correspondence intended only for use of the individual or entity named above. If you are not the intended recipient or the agent responsible for delivering the message to the intended recipient, you are hereby notified that any disclosure, distribution or copying of this communication is strictly prohibited. If you have received this communication in error, please notify the sender by phone or by replying this message, and then delete this message from your system.   ------------------------------   -- James Bond

Steven Rubin <str...@staticfreesoft.com>: Oct 22 04:27PM -0700 The SPICE writer calculates these values and puts them in the deck. If you wanted other values, you would have to make them into "Variables" which are values stored on Electric objects. You could even get the SPICE writer to use them in a number of ways, but then you'd be responsible for computing the proper values. Better to let the system do the math.      -Steven Rubin     On 10/22/2019 2:45 PM, Alexandre Rusev wrote:

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[Steven Rubin]

Yes, it does examine all of the cell's geometry to calculate areas and perimeters.

   -Steve

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