Re: [SI-LIST] : A Question About Power Noise.

Vinu Arumugham (vinu@cisco.com)
Wed, 17 Mar 1999 09:39:23 -0800

Mark,

Is a low value of capacitance really important? At 1GHz+, the package inductance dominates the characteristics and so the impedance of a 0.1uF and a 100pF capacitor in an 0603 package will not be very different. As you point out,
for better performance at higher frequencies one would need a lower inductance 0402.

Thanks,
Vinu

Mark Randol wrote:

> SMT 0603 ceramic caps are still pretty good at 1GHz+ as long as you keep
> the value under a couple 100pF. 0402's go up through a couple GHz.
>
> --
> ---------------------------------------------------------------
> Mark Randol, RF Systems Engineer | Motorola SPS, Inc.
> (602)413-8052 Voice | M/S EL379
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> ryvw50@email.sps.mot.com | Tempe, AZ 85284
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