[SI-LIST] Zodd Differential Calculation for Hspice w-element
- From: V S <for_si2003@xxxxxxxxx>
- To: si-list@xxxxxxxxxxxxx
- Date: Fri, 8 Aug 2003 09:28:46 -0700 (PDT)
I have following Hspice w- element file for a pair of
differential Stripline
.MODEL diff_pair W MODELTYPE=RLGC, N=2
+ Lo = 4.00e-007
+ 1.00e-007 4.00e-007
+ Co = 1.00e-010
+ -3.00e-011 1.00e-010
Ignoring Rs , Gd etc. can someone tell me what
exactly is the Zodd ( differential ). I assume it will
be
Zodd(diff)= 2*sqrt((4.0e-7 -1.0e-7)/(1.0e-10
+3.0e-11))
= 96 Ohm
What will be single Ended Impedence ?
Z ( se ) = Sqrt (4.00e-007 / 1.00e-010 ) = 61 Ohm
I am not sure if the Maxwellian "C" for single ended
calculation should be taken as
1. C = 00e-010 or
2. C = 1.00e-010 - 3.00e-011
Thanks
Vikas
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