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From: | Steven Rubin |
Subject: | Re: SCMOS rules, MOSFET width |
Date: | Sun, 02 Nov 2008 19:53:00 -0800 |
At 06:50 AM 11/2/2008, you wrote:
Dear Electric buglist,I'm having a problem with MOSFETs when using the "Analog" technology option (actually it seems to be the choice of SCMOS rules rather than Submicron rules in the ProjectSettings->Technology menu). Electric thinks the width of some transistors is 2 lambda bigger than it really is.If I instantiate the P-Transistor-Scalable or N-Transistor-Scalable I get a MOSFET with a width of 3 lambda and the active region under the poly is correctly drawn at 3 lambda. However, if I use the plain P-Transistor and N-Transistor components and check the properties of the transistors the width will be reported as 5 lambda, even though the transistors are drawn with an actual width of 3 lambda. The offending transistors are also drawn with a 3 lambda extension of the gate rather than 2 lambda.Moving the cursor over these transistors shows that Electric thinks the pin in the channel is extended 1 lambda beyond the active at each end, only for the plain transistors.Deselecting the "ProjectSettings->Technology->Analog" option and changing from "SCMOS rules" to "Submicron rules" appears to fix the problem.I'm using Electric 8.07 on Red Hat Enterprise 4 linux with java version 1.6.0_07. Am I doing something wrong here, or overlooking something?
You have found a bug in Electric that was fixed in September. If this particular transistor configuration is necessary for your work, contact me and I will discuss ways to fix it. Otherwise, our next release, due out before the end of the year, will correct this problem.
-Steven Rubin
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