need some info.....

Manjunath Shamanna (manju@ibmoto.com)
Tue, 9 Jan 1996 12:27:12 -0600 (CST)

Hi folks,
I am a VLSI circuit designer and hence a novice when it comes to the
emagnetics. I do have a question for you:
In most of the high performance and large chips, the power supply and
some of the critical signals are routed in metal lines which are wide. There
was also a paper by one of the alpha designers about the inductance effects of
the wide power bus lines inside their alpha chips. So Instead of having a
single wide line, how about having a bunch of narrow strips of the metal lines
such that the total width of all the narrow strips equals the width of single
wide line with maybe even shorting bars in the perpendicular direction at some
predetermined intervals?

Would this reduce the inductance effects? Would this bunch of the narrow
metal strips behave similar to a single wide line if the distance (pitch)
of seperation between the individual strips? What would be an acceptable pitch
relatively speaking ( no hard numbers needed)?

I know doing this might increase the area. But if i dont care about the area
of the wiring so much, is there any other alternate ways? better ways?

This may already have been discussed before on this forum, if so I would
appreciate any info about this in the archives or if you could send me any
info by email to me instead of the forum please do so to
manju%ibmoto.com@oakhill.sps.mot.com

Thank you
regards
manju