| ??? 04/17/13 00:41 Read: times |
#189662 - Exactly Responding to: ???'s previous message |
Hi Andy,
Exactly. The distance between a signal line and its return path (e.g. return line, gnd plane, etc.) is a 1st order parameter controlling its impedance. If all the signals had to return through a common line, the impedances of the various lines would be significantly different and their individual s-parameters would be all over the place. I said "perhaps fortuitous" in my previous post because the last time I saw a data sheet concerning such things it claimed that effect of the extra ground lines was to shield the signal lines from each other, preventing induced interference. While I have no doubt the specified configuration drastically improved the cable's performance, I doubt this explanation. Joe |
| Topic | Author | Date |
| Measuring trace impedance with a TDR? | 01/01/70 00:00 | |
| Maybe there's help here ... | 01/01/70 00:00 | |
| Thanks. Hardware/model specific | 01/01/70 00:00 | |
| Beauty contest | 01/01/70 00:00 | |
| Growing your own | 01/01/70 00:00 | |
| What information do you want to extract? | 01/01/70 00:00 | |
| desired information | 01/01/70 00:00 | |
| "pre-loved" | 01/01/70 00:00 | |
| Pre "loved" | 01/01/70 00:00 | |
| Resolution | 01/01/70 00:00 | |
| ??? | 01/01/70 00:00 | |
| Plenty, I'm sure, but ... | 01/01/70 00:00 | |
| cost | 01/01/70 00:00 | |
| Though this is a large and cumbersome instrument ... | 01/01/70 00:00 | |
| Better than standard solutions? | 01/01/70 00:00 | |
| How do they do so? | 01/01/70 00:00 | |
| Magic? | 01/01/70 00:00 | |
| signal integrity | 01/01/70 00:00 | |
Exactly | 01/01/70 00:00 |