Re: New version of The Electric VLSI Design System

[Steven Rubin]

> I have installed  'Electric' version  8.04.  This is really amazing!
> I would like to try on some of the analog blocks. Can I use 4 
> terminal MOS devices in 'Electric' as is often the case where the 
> body is not tied to the source in analog circuits?  What would be 
> limitations? (The manual says 'Electric does not keep track of the 
> connectivity of the substrate connection of layout transistors.')

You can place 4-terminal transistors from the schematics 
technology.  Their use may or may not work, depending on the 
simulation environment.  For Analog simulators such as Spice, all 4 
connections are written, and it will work fine.  For some digital 
simulators, the bias connection is ignored, and so you may have 
trouble if you are doing non-digital wirings.

>  Also what would be the case when the body of MOS is not tied to 
> the substrate? How is it handled in Electric?

In such a case, the Spice netlist will be incomplete, and other 
netlists will not notice.

   -Steven Rubin