( ESNUG 357 Item 3 ) --------------------------------------------- [8/10/00]
Subject: ( ESNUG 356 #2 ) Cadence Diva LVS Tricks For Identical Devices
> I have a little problem, I made a layout of a circuit which is symetrical
> in architecture but not in parameters: A differential input with 2
> resistors load. The only difference is transistor width.
>
> When I do a LVS, the netlists don't match, the netlister would want me to
> invert my 2 transistors. When I add an output pin, the problem is solved
> (the circuit becoming non-symetrical).
>
> Anybody know how to do to solve this problem without adding a new pin??
>
> - Sami Aissa
> Matra Nortel
From: Wayne Miller <Wayne.A.Miller@smsc.com>
When all else fails, use an LVS correspondence file to identify one or two
instance matches between the schematic and the extracted layout. It's a
bit of a cludge, but it works, and surprisingly, extraction to extraction,
many of the extracted instance names don't change. (If you're just making
small changes to your layout.)
- Wayne Miller
Standard Microsystems Corporation Long Island, NY
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