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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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