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Design >> Analog Design >> What does Pad Ring Used for?
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Message started by qiushidaren on Jan 11^th, 2007, 6:56pm

Title: What does Pad Ring Used for?
Post by qiushidaren on Jan 11^th, 2007, 6:56pm

Hi all,

In Dolphin’s Virtual Component specification, I find some pads have pad rings, but I don’t know what does pad ring used for, cuz I haven’t heard of “pad ring” before. Can someone explain it for me?

Regards,
Terry

Title: Re: What does Pad Ring Used for?
Post by Croaker on Jan 12^th, 2007, 8:49am

Pad can either refer to the bonding pad or the entire IO circuit. The pad ring is the entire ring of IO circuits that goes around the chip. If you're saying there's a pad ring in your pad circuit, I guess you might be referring to some metal that is used to link up adjacent pads and distribute vdd/gnd.

There are also guard rings used for isolation of transistors and there's a seal ring that goes around the chip to mechanically stabilize it.