[SI-LIST] : parasitic value for via

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From: chlee99@samsung.co.kr
Date: Fri Sep 15 2000 - 22:08:11 PDT


Hello everyone.

I am looking for parasitic value for via.
and Dr Johnson's derivation is ...

  C=[1.41*Er*T*D1]/[D2-D1]
 where D2= diameter of clearance hole in GND plane,
       D1= diameter of pad surrounding via,
       T = thickness of PCB,
       Er= permeability.

parasitic inductance of via :
  L= 5.08h[ln(4h/d)+1]
 where h= length of via,
       d= diameter of via.

Let me explain
How this equation is derived?

thanks.

             

**********************************************
 Chunho Lee,
 Senior Engineer,
                                                            
 SAMSUNG ELECTRONICS CO.,
 E-CIM, Management Innovation Team,
 416, Maetan-3dong, Paldal-gu,
 Suwon city, Korea
 Tel : 82-31-200-3097
 email: chlee2@samsung.co.kr
**********************************************

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