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Pocket-Sized 6 GHz 1 TS/s ET Scope

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SJL-Instruments:

--- Quote from: joeqsmith on January 30, 2024, 02:32:06 pm ---It would be nice to have some of the features mentioned for the review as I would rather avoid having to use my software.   At the same time, I understand that completing that list of features is going to take some time.

--- End quote ---
Yep, we're aiming to have the most useful features implemented by Saturday.


--- Quote from: joeqsmith on January 30, 2024, 02:32:06 pm ---Yes, DC linearity.   There was a reason I asked about this undocumented X1 command...

From that, I assume it is linear up to where it starts to clip.   Any idea what the recovery time is?  Can I drive the input into saturation without damaging it? 

--- End quote ---
DC linearity is 0.1%, although we don't characterize this on a per-unit basis.
There is no recovery time as the signal does not clip. This is inherent to our choice of architecture. You can apply any signal within the absolute maximum range (±1.2V) indefinitely.
(The official software soft-clips the signal to 1.1V, but this isn't a hardware limit.)

joeqsmith:
I think you are stating that as long as the signal remains within some defined limits, the front end will not saturate, clip or compress.  I guess you could say that about any circuit.   That is not what I am asking.   Early on you mention driving it with 5V.  Far outside the specified limit.  What happens under this condition?

SJL-Instruments:

--- Quote from: joeqsmith on January 30, 2024, 03:31:43 pm ---I think you are stating that as long as the signal remains within some defined limits, the front end will not saturate, clip or compress.  I guess you could say that about any circuit.   That is not what I am asking.   Early on you mention driving it with 5V.  Far outside the specified limit.  What happens under this condition?

--- End quote ---
We haven't characterized this in detail, as it's outside the absolute maximum operating conditions.
We still expect zero recovery time and no compression, as there is no amplifier to saturate.
If the signal exceeds 1.5V, you will not be able to measure it, since the CDF query voltage ranges only from -1.5V to 1.5V.

The accuracy within the operating band (±950 mV) will likely remain unaffected even if the signal itself goes up to ±2V. Beyond that, the frontend chip may eventually experience thermal failure, and the input will fail open (high-impedance). You can probably get away with larger spikes if they are infrequent.

Any damage to the frontend is covered by warranty.

joeqsmith:
Can you provide a sketch of the front end?

SJL-Instruments:

--- Quote from: joeqsmith on January 30, 2024, 03:52:09 pm ---Can you provide a sketch of the front end?

--- End quote ---
The frontend consists of a latched comparator with the signal sent into one input and the other input held at the CDF query voltage.
If you're asking about the saturation recovery time of the comparator (which contains a limiting amplifier), it's independent of the overdrive voltage and equal to the 40 ps rise/fall time of the scope.
(It's in this sense that there's zero recovery time - it doesn't depend on what signal you put in.)

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