[SI-LIST] Re: differential pair routing topology
- From: "Mark Randol" <Mark.Randol@xxxxxxxxxx>
- To: <si-list@xxxxxxxxxxxxx>
- Date: Mon, 24 Apr 2006 09:03:12 -0700
It's an 'it depends' again.
For planar inductors square corners can make a big difference in the
performance of the inductor. It's still not the corner capacitance.
The corners don't add much mutual inductance, but they do add resistive
loss, lowering the Q. =20
The additional inter-layer capacitance from the relatively unproductive
metal length is a problem as well, but it's not specifically the corners
that's the problem. The additional capacitance lowers the self resonant
frequency.
Octagonal shapes give nearly the same performance as round spirals, but
are easier to create on some CAD tools.
Regards,
--
Mark Randol
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