Re: [SI-LIST] : Adding inductors to ground?

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From: Ritchey Lee (leeritchey@earthlink.net)
Date: Thu Mar 02 2000 - 17:46:33 PST


It's a common practice that is a bad idea. Can't say how it got started, but it's a sure way to degrade the performance of parts.

Lee

Chris Bobek wrote:

> Hi,
>
> I came across a schematic that shows the PLL ground of an IC connected
> to ground through an inductor. The Vcc pin of the device is connected
> to a bunch of caps and an inductor to Vcc.
>
> I understand and have used an inductor (or a resistor) with a bunch of
> decoupling caps on Vcc for applications like this. But, I've always
> tied the Gnd pin(s) directly to ground. It doesn't make any sense to me
> why you would want to add inductance in the path of any ground. It
> seems you would just add switching noise to your device.
>
> Can somebody explain whether this is common practice, or whether it was
> a poor design (sorry I don't have more information on the particular
> device).
>
> Thanks,
>
> Chris
>
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