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> 1 GHz DIY differential probes
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Carrington:
Cool!  :-+


--- Quote from: nctnico on November 15, 2018, 11:58:49 pm ---... If there is some interest I could have a small batch made ...

--- End quote ---

I'm interested, and I think I'm not going to be the only one.  :)
nctnico:

--- Quote from: Hydron on November 16, 2018, 11:41:36 am ---Looks great, definitely interested in more details/design info.

RE the offset issue - I assume that you're terminating the inverting output in 100R, could you potentially use this output to sense the offset when inputs are shorted and use a micro to calibrate it out using a digital pot/dac when a button is pressed? If the offset doesn't drift then this is probably overkill and a pot is the best.

--- End quote ---
That could be an option. The datasheet from TI actually suggests to use an extra opamp to correct the offset error of the LMH3401. I'm wary to do that because it complicates the PCB design and some extra load needs to be connected to the output of the LMH3401. I suppose the offset doesn't drift that much but it is something I could test to see if it depends a lot on the operating temperature.
JohnG:

--- Quote from: Carrington on November 16, 2018, 12:21:14 pm ---Cool!  :-+


--- Quote from: nctnico on November 15, 2018, 11:58:49 pm ---... If there is some interest I could have a small batch made ...

--- End quote ---

I'm interested, and I think I'm not going to be the only one.  :)

--- End quote ---

I would also be interested.

Thanks,
John
dpenev:
I am interested too.

Sent from my MI NOTE Pro using Tapatalk

rx8pilot:
This is a very interesting and practical project. Very impressive results.

Digging through the rest of the thread looking to see how you measured impedance and capacitance - delicate measurements.

Short and misplld from my mobile......

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