**From:** Gary Peterson (*[email protected]*)

**Date:** Wed Nov 01 2000 - 12:50:37 PST

**Next message:**Ed Priest: "RE: [SI-LIST] : effect of trace width on the performance"**Previous message:**George Shaw: "Re: [SI-LIST] : effect of trace width on the performance"**Next in thread:**Charles Grasso: "Re: [SI-LIST] : differential impedance calculations"**Reply:**Charles Grasso: "Re: [SI-LIST] : differential impedance calculations"**Reply:**Brad Underwood: "Re: [SI-LIST] : differential impedance calculations"**Maybe reply:**Larry Miller: "RE: [SI-LIST] : differential impedance calculations"**Maybe reply:**Larry Miller: "RE: [SI-LIST] : differential impedance calculations"**Maybe reply:**Jason Xiao: "RE: [SI-LIST] : differential impedance calculations"**Maybe reply:**Dan Swanson: "RE: [SI-LIST] : differential impedance calculations"

I seem to recall Dr. Howard Johnson mentioning that impedance calculation

formulas made assumptions (since closed-form solutions aren't possible).

Can someone comment on assumptions made for the equation for differential

impedance shown below? Seems to me that as traces get closer together, the

single ended impedance would be affected. When I calculate single-point

values for differential impedance using Hyperlynx LineSim, I do see the

single-ended impedance change when the spacing between the pair gets small.

Thanks,

Gary Peterson

(Embedded image moved to file: pic27894.pcx)

- application/octet-stream attachment: pic27894.pcx

**** To unsubscribe from si-list or si-list-digest: send e-mail to

[email protected] In the BODY of message put: UNSUBSCRIBE

si-list or UNSUBSCRIBE si-list-digest, for more help, put HELP.

si-list archives are accessible at http://www.qsl.net/wb6tpu

****

**Next message:**Ed Priest: "RE: [SI-LIST] : effect of trace width on the performance"**Previous message:**George Shaw: "Re: [SI-LIST] : effect of trace width on the performance"**Next in thread:**Charles Grasso: "Re: [SI-LIST] : differential impedance calculations"**Reply:**Charles Grasso: "Re: [SI-LIST] : differential impedance calculations"**Reply:**Brad Underwood: "Re: [SI-LIST] : differential impedance calculations"**Maybe reply:**Larry Miller: "RE: [SI-LIST] : differential impedance calculations"**Maybe reply:**Larry Miller: "RE: [SI-LIST] : differential impedance calculations"**Maybe reply:**Jason Xiao: "RE: [SI-LIST] : differential impedance calculations"**Maybe reply:**Dan Swanson: "RE: [SI-LIST] : differential impedance calculations"

*
This archive was generated by hypermail 2b29
: Tue May 08 2001 - 14:29:57 PDT
*