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[SOLVED] Difference b/w rectangle (r) or path (p) for routing purpose in layout XL.

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hetirajhimanshu

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Suppose I am connecting VDD to source of a PMOS and for this purpose, the dimension of the required route is 2um x 0.2um. Now what is advisable - drawing this route using the rectangle (r button on keyboard) or use the path (p button on keyboard) for the same route and why? basically what is the difference b/w the two of them?
 

I like rectangles but most "digital" layout folks
like paths, they are easier to manipulate (stretch)
later. They can be prone to off-grid corners if you
set the width and justify properties wrong, and
the endpoint is often a nuisance (end up with
weird notches / stubs etc. if you don't double-
click just right).

If you're doing a lot of long and non-straight
routes, paths are probably your friend. I do a
lot of analog / power type designs where I care
about trace geometry and often taper it, which
a path can't do but merged polygons, will.

They all end up the same metal in the end, pick
what suits your layout style.
 

Thank you for your suggestion dick_freebird, but my mentor under whom I am doing my project strictly warned me not to use rectangle but paths for routing while designing analog circuits and he even asked me to find the reason behind this as to why we cannot use rectangle to route the same ?

Probably it will be helpful if u give me technical reasons like parasitics and all.
 

If you work with straight lines connections there's no difference. But, if you are going to have any corner in your routing, you will need a number of rectangles (r) similar to the number of corners, while the path (p) will be only one geometrical polygon.

In order to re-route or modifie the connection it is much easier to work with paths (p) than rectangles (r).

There's no other "Tecnological" difference. Is just about doing things right.
 
Thanks a lot CMOS-Tangram. Your answer is somewhat satisfying to me and you cleared my doubt.
 

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