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# How to model the following twisted pair cable in PSPICE? Help ASAP

Last post Wed, May 18 2011 8:15 AM by alokt. 1 replies.
 Started by gatedne 11 Apr 2011 01:15 PM. Topic has 1 replies and 2567 views
• #### Mon, Apr 11 2011 1:15 PM

• gatedne
• Joined on Mon, Apr 11 2011
• Posts 2
• Points 40
How to model the following twisted pair cable in PSPICE? Help ASAP
 Hi all,I have a twisted shielded differential signal pair carrying LVDS data. I have an adjacent twisted shielded power cable 28V on one line and rtn on the other. They are all in the same cable. I would like to model this for a transient response and see how a pulse on the power line effects the signal integrity on the adjacent LVDS twisted pair. I need to model the mutual L and C between all conductors ( 2 pwr and 2 signal) in the cable. I haven't done something like this using PSPICE before and so it would be very useful to hear from someone who has modelled something like this before.  thanks
• Post Points: 20
• #### Wed, May 18 2011 8:15 AM

• alokt
• Joined on Fri, Aug 22 2008
• Noida, Uttar Pradesh
• Posts 241
• Points 3,470
Re: How to model the following twisted pair cable in PSPICE? Help ASAP
 One possible way to insert a series "L" in all four signal path and link them via one common coupling. You need to keep coupling coefficient to a low value to have loose coupling. I would connect "C" directly between two adjacent signals.
• Post Points: 5
###### Sort Posts: Oldest to newest Newest to oldest
 Started by gatedne at 11 Apr 2011 01:15 PM. Topic has 1 replies.
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