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SCMOS rules, MOSFET width


From: Kenneth Joseph Hass
Subject: SCMOS rules, MOSFET width
Date: Thu, 30 Oct 2008 08:32:48 -0700 (PDT)

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?

Thanks,
Joe


      




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