Timeline for Connecting LVDS to oscilloscope using ferrite bead to isolate GND/SHIELD
Current License: CC BY-SA 4.0
4 events
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| Sep 8, 2023 at 16:03 | comment | added | Hearth | A pair of good 10x RF passive probes might be the way to go. It's not difficult to make this type of probe yourself--a 450 Ω resistor (not wirewound) in series with a length of coax (I suggest RG-316, double-shielded if you like) terminating in the scope's 50 Ω termination impedance is all you need. You can also buy them premade, LeCroy sells one as the PP066 for instance. | |
| Sep 8, 2023 at 16:00 | comment | added | Tim Williams | I don't understand what the stackup is showing. If that means a PCB, then first why is there a dedicated PCB design with poor grounding for this (test fixture I guess), whatever it is? Where would the transmission-lines diagram be applied? You say by the "AVOID" you cannot afford loading the signal (I guess) so terminating pairs into the scope seems N/A. Your "preferred" list subtly says "avoid diff probes" (plural) but "use standard [coax]" (singular), but you cannot read both DM and CM simultaneously over a single connection. And what's wrong with the "IDEAL" example, common ground? | |
| Sep 8, 2023 at 15:48 | history | edited | JRE | CC BY-SA 4.0 |
deleted 14 characters in body
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| Sep 8, 2023 at 15:31 | history | asked | Tony | CC BY-SA 4.0 |