[SI-LIST] Re: Is Impedance Enough for Describing the PDS?

  • From: boris.traa@xxxxxxxxxxx
  • To: scott@xxxxxxxxxxxxx
  • Date: Mon, 12 Jul 2004 10:32:58 +0200

I once wrote down an invention disclosure on SMD-capacitors and 
construction with a very low inductance and appropriate to be used with a 
very low inductive connection. After submission the research done by our 
IP department came up with a Murata patent covering capacitors with an 
comparable construction and with only 10 pH self-inductance. For further 
information I guess you may find something at the Internet.
Kind regards
Boris Traa

System design engineer EMC

PDSL/EMC3
Building WDV, room 1.01
Prof Holstlaan 4
5656AA Eindhoven, The Netherlands
Tel: ++ 31 40 27 43766
Fax: ++ 31 40 27 42224
E-mail:  boris.traa@xxxxxxxxxxxx Seri: btraa@nlsce1

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Scott McMorrow <scott@xxxxxxxxxxxxx>
Sent by: 
si-list-bounce@xxxxxxxxxxxxx
09-07-2004 17:48
Please respond to scott

 
        To:     zhang_kun@xxxxxxxxxx
silist <si-list@xxxxxxxxxxxxx>
        cc:     (bcc: Boris Traa/EHV/PDSL/PHILIPS)
        Subject:        [SI-LIST] Re: Is Impedance Enough for Describing the 
PDS?
        Classification: 




Zhangkun,

Zhangkun wrote:

>How about the value of the inductance of these kind of capacitors? When 
the cap is soldered on the PCB, there is leading inductance of about 1nH. 
This could not be eliminated by better caps. 
>
> 
>
Actually, better designed capacitors and better mounting structures do 
help.  Steve and I both have developed mounting structures for some of 
these capacitors that are down in the 200 pH range, with a total mounted 
device inductance below 400 pH.  It's all a matter of physics and good 
design practices.  With X2Y and IDC capacitors, we can obtain between a 
3 and 4-to-1 part count reduction over 0603 capacitors with the best 
designed mounting solution.

regards,

scott

-- 
Scott McMorrow
Teraspeed Consulting Group LLC
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(401) 284-1827 Business
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