[SI-LIST] Re: Capacitor Arrays for clock AC coupling
- From: steve weir <weirsi@xxxxxxxxxx>
- To: matusov@xxxxxxxxxxxx, "SI-LIST" <si-list@xxxxxxxxxxxxx>
- Date: Fri, 10 Feb 2006 23:25:38 -0800
Mikhail,
NPO has a much lower Er, requiring many more plates for the same
capacitance as X7R, and so a much lower ESR and higher Q.
Steve
At 11:17 AM 2/10/2006 -0500, Mikhail Matusov wrote:
>Steve,
>
>Can I ask you what's wrong with the NPOs provided that the value is
>sufficient?
>
>
>Thanks,
>=======================
>Mikhail Matusov
>Hardware Design Engineer
>Square Peg Communications
>Tel.: +1 (613) 271-0044 ext.231
>Fax: +1 (613) 271-3007
>http://www.squarepeg.ca
>
>
>
>----- Original Message -----
>From: "steve weir" <weirsi@xxxxxxxxxx>
>To: <david@xxxxxxxxxxxxxx>; "SI-LIST" <si-list@xxxxxxxxxxxxx>
>Sent: Friday, February 10, 2006 10:55 AM
>Subject: [SI-LIST] Re: Capacitor Arrays for clock AC coupling
>
>
> > David,
> >
> > My "donts'":
> >
> > Don't line up those arrays in a big line.
> >
> > Don't worry about tolerance between the caps.
> >
> > Don't use NPO
> >
> > Don't use a higher value than necessary.
> >
> > Don't forget to think in terms of fields.
> >
> > Good luck.
> >
> > Steve.
> >
> > At 01:43 PM 2/10/2006 +0000, David Greig wrote:
> > >Hi List,
> > >
> > >Apart from "don't do it!", would anyone care to share their experiences
> > >(bad or otherwise) of using 2 capacitor arrays for
> > >differential clock coupling?
> > >The parts in mind are 0504 arrays, NP0 100p or X7R 10n, 10% tol. There
>are
> > >no supporting S params or models from the
> > >manufacturers that I have contacted.
> > >
> > >Best Regards
> > >
> > >David Greig
> > >
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