RE: [SI-LIST] : Capacitor dielectric type

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From: Larry Miller (ldmiller@nortelnetworks.com)
Date: Mon Nov 20 2000 - 08:56:57 PST


Interesting point. R-C "snubber" networks have long been used to each
transient ringups in power transistor and SCR circuits at lower frequencies.

What frequency range would you be considering this for?

Larry Miller

> -----Original Message-----
> From: Bob Weber [SMTP:rweber@txc.com]
> Sent: Monday, November 20, 2000 6:11 AM
> To: Tae-Kwang Jeon; si-list
> Subject: RE: [SI-LIST] : Capacitor dielectric type
>
> TK,
>
> This will likely cause some discussion, but I avoid using NP0 or C0G
> capacitors for bypassing because of their low ESR. Small value (1nF) X7R
> capacitors have noticeable ESR (0.5ohm), but this is a good thing. It
> provides a damping element to absorb the ringing that develops on the
> power-ground planes due to parasitic resonances between the bypass
> capacitors and the unavoidable inductance of the connections.
>
> Bob W.
>
> -----Original Message-----
> From: owner-si-list@silab.eng.sun.com
> [mailto:owner-si-list@silab.eng.sun.com]On Behalf Of Tae-Kwang Jeon
> Sent: Thursday, November 16, 2000 6:47 PM
> To: si-list@silab.eng.sun.com
> Subject: [SI-LIST] : Capacitor dielectric type
>
>
> Hello,
>
> I'm trying to put multiple decoupling capacitos on my board mixing small
> and
> large values in order to minimize the ESL and ESR.
> What I'm wondering is when I use different types of dielectic for the
> capacitors. For instance, I'm going to use 0.022uF X7R type and 470pF of
> NPO type because NPO has the lowest ESR.
>
> Does anybody know whether or not it's not a big deal in terms of mixed
> dielectric material for high frequency decoupling?
>
> Thanks,
> TK
>
>
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