That being said, the measurements can both be done. I shoud try making a USB IP core someday to understand that better. The numbers seem slightly off, but I'm not entirely sure of the exact implementation, so they may be fine. 1 members found this post helpful. It appears to me too elliptical and I could not get its intent. I found the following note on a PCB manufacturing file as shown in the attached picture, and reads "5.1 mil traces ON layernd 10 TO BE 55 OHM. 20th March 2011, 19:28 #8 Re: What does "100 Ohm differential" mean? Hmm ok i got. It plays a role for the transmission of (unwanted) common mode interferences. The important thing is that the termination impedances agree with the cable impedances to minimize reflections. The values in that range are achievable with reasonable dimensions and standard dielectric materials, and match non-printed conductors such as twisted wires (Ethernet cable) and coaxial cables. It would be better to know which trace layout is described here. Imagine a differential pair made of two individually screened 50 ohm cables.

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Also some differential standards,.g. Single Endend impedance is assuming the impedance a driver would see from its output to the ground, and differential impedance would be the impedance assuming the line as a load between both differential ends of a single driver, so the ground is usually used just. What does it refer to? A differential transmission line will allow to measure three different impedances. Apparently differential signaling is intended. If the traces are coupled, keeping the 100 ohm differential impedance, the common mode impedance will be increased. Originally Posted by FvM - single ended impedance of both traces connected together, usually referred as common mode impedance of a differential pair I could not get this. (Not reasonable in general, but sometimes used for test and measurement purposes). Advertisment 24th March 2011, 09:53 #9 Re: What does "100 Ohm differential" mean? As far as i understand that. Dear FvM, I heard that German language is very precise, is it from German that your perhaps borrowed the habit of an additional comma after "It's only said" for some grammatical purposes? single ended impedance of one trace with the other connected to ground - single ended impedance of both traces connected together, usually referred as common mode impedance of a differential pair - differential impedance, you see, that it can be meaningful to specify single.

uses single ended signalling as part of the protocol, and thus specify a common mode impedance in addition to the differential value. Single ended, aND 100 OHM differeniial.". Since it is already said to be single-ended, which means the board doesn't use differential signaling. I never heared of a USB working as single-ended, just differential. Dear FvM, I have confirmed that differential refers to differential signal transmission, used on DDR2 interface for crucial clock signals. Coaxial cable is usually 50, 75 or 95 ohms. It has a common mode impedance of 25 ohm and and a differential impedance of 100 ohm. Bob Post New Thread Please login « Previous Thread Next Thread » Similar Threads.


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Bob Post added at 09: Previous post was at 09: Dear enjunear, This makes sense, and agrees with formulas I have seen (Z(diff) 2Z0). 20th March 2011, 17:28 #2, re: What does "100 Ohm differential" swinger club berlin sie sucht ihn erotik brandenburg mean? 20th March 2011, 19:20 #7 Re: What does "100 Ohm differential" mean? Advertisment 20th March 2011, 17:51 #3, re: What does "100 Ohm differential" mean? Any way, now i see what you meant. My question is: Since it is already said to be single-ended, which means the board doesn't use differential signaling; then why there is still "100 Ohm differential" requirement? Bob, last edited by bobsun; 20th March 2011 at 17:43. By changing the trace width and separation, both values are modified in a different way. And could you parse "5.1 mil traces ON layernd 10 TO BE 55 OHM. 2 members found this post helpful. Measuring between the two conductors, disregarding the common ground (differential you should get 100 ohms of transmission line impedance. 20th March 2011, 18:55 #6 clothed female naked male schmutzige geschichten leseprobe Re: What does "100 Ohm differential" mean? But this behavior of a protocol (like USB) using 2 lines arschgeile frauen sexy web cams free as differential and sometime as single-end is new. Bob 20th March 2011, 18:04 #4, re: What does "100 Ohm differential" mean?

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Thank you 1 members found this post helpful. Post New Thread, results 1 to 9 of 9 20th March 2011, 17:06 #1, what does "100 Ohm differential" mean? Advertisment 20th March 2011, 18:13 #5, re: What does "100 Ohm differential" mean? Hello, I would like to ask a question on impedance. It's only said, that the single ended trace impedance should be 55 ohm.