Electronics > Beginners
How to do logic level compatibility for differential signals?
(1/1)
electrowhiz:
Hi All,
When we do logic level compatibility or noise margin analysis for single ended signals we will check the below criteria:
Voh > Vih
Vol< Vil
How we should do the logic level compatibility for differential signals?
Thanks
Aggressive_Doughnut:
Most datasheets contain the information you are looking for: example. Generally, you are measuring the difference (V_ID which I always assumed means Input Difference Voltage) and determining if that difference surpasses a certain threshold.
tggzzz:
Common mode voltages should be compatible, i.e. mean output voltage within mean input voltage range specified by the reciever.
Differential mode voltage should be compatible.
If necessary, the max and min voltages should be compatible, but that is often implicit in the common and differential mode voltage specifications.
electrowhiz:
Thanks for the reply. I also have another doubt. What is the difference between AC logic level and DC logic level?
tggzzz:
--- Quote from: electrowhiz on April 04, 2019, 01:26:47 pm ---Thanks for the reply. I also have another doubt. What is the difference between AC logic level and DC logic level?
--- End quote ---
I don't recognise those terms. I could guess, but that would be a waste of everybodies time.
Navigation
[0] Message Index
Go to full version