FreeLists / si-list / [SI-LIST] Re: Is Impedance Enough for Describing the PDS?

[Scott McMorrow <scott@xxxxxxxxxxxxx>]

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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