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| Low cost logic analyzer probe for Rigol MSO5000 EasyEDA project |
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| S. Petrukhin:
--- Quote from: Gandalf_Sr on June 08, 2020, 03:25:44 pm --- --- Quote from: S. Petrukhin on June 08, 2020, 03:12:27 pm ---...But why do you say it's a current line? Maybe I not understand the terminology in English, but this is not a line like 4..20 mA, where the signal is transmitted by current. Aren't these resistors the matching ones for the wave resistance? --- End quote --- If you look at the first picture at this link on LVDS, you will see that LVDS, at its heart, is a 3.5 mA constant current supply that is switched via an 'H' bridge circuit so it actually, it IS a current system which is why you need the terminating resistor to get you the the Hi and Lo voltage levels that the RSPECL inputs expect. --- End quote --- Understood. Thanks! :-/O |
| tv84:
--- Quote from: Gandalf_Sr on June 08, 2020, 02:40:50 pm ---Anyway, I have these LVDS terminating resistors on my design and it works with them and it doesn't work without them. Long story short, I think Sergey is right to include the terminating resistors. --- End quote --- Nothing beats the experimental method. :) |
| sbehnke:
Looking forward to your testing to see if this works as designed. I'd love to order one for myself. |
| S. Petrukhin:
--- Quote from: sbehnke on July 04, 2020, 06:20:46 pm ---Looking forward to your testing to see if this works as designed. I'd love to order one for myself. --- End quote --- Unfortunately, delivery is very slow now, I'm still waiting for LVDS drivers. Subscribe to this topic - I will definitely inform here. |
| S. Petrukhin:
Dear friends, good news! The Probe is assembled and checked, works correctly. Checked from the built-in generator at 15MHz (generator limit). D0-D7 inputs are connectet to first built-in generator at 5MHz. D8-D15 inputs are connected to second buid-in generator at 15MHz (generator limit). CH4 input is connected as D8-D15 inputs. Both generators have settings: Square, MinLevel=0V, MaxLevel=2.5V (generator limit). Trigger from CH4. |
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