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

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From: Lum Wee Mei (lweemei@dso.org.sg)
Date: Fri Mar 03 2000 - 01:14:48 PST


Lee, if that is the case, what is your expert advise for this issue?

Regards.

Ritchey Lee wrote:

> 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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