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Time to amplitude converter

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Sankha:
Hi,

Im Sankha from university of Colombo, Sri Lanka. To measure nanosecond scale [1 to 5 ns]  pulse width we need to make a time to amplitude convertor (TAC). Can anyone help me to find a circuit diagram of  such a device or any alternative solution to this problem is highly appreciated..!   

Christe4nM:
I'm not sure if you are looking for help with an assignment, or rather working in a lab and needing a circuit to assist you with the research you are working on.

In the case of it being an assignment, I'll give you something to help you on your way. I think you'll learn a lot more from it than just finding a circuit. So think about this: what happens to the voltage on a capacitor when a constant current flows into it? And how could that principle be used to make what you are looking for?

If the latter, I'm sure others will tune in with something that will get you to what you need.

ch_scr:
I guess you would want to measure the voltage afterwards, to get a digital value proportional to the pulse?
If yes, then there is an integrated solution called "Time to Digital Converter" TDC from TI https://www.ti.com/product/TDC7200
This has been used in an open source project: https://github.com/TAPR/TICC/tree/master/TICC
You can also buy this: https://tapr.org/product/tapr-ticc/

NiHaoMike:
Other than just using a (fast) scope, the only way I can think of that doesn't require complex RF design is to use a FPGA with a fast SERDES block.

That TI chip, while quite interesting, can only go down to 12ns.

ch_scr:

--- Quote from: NiHaoMike on January 21, 2022, 01:19:25 pm ---Other than just using a (fast) scope, the only way I can think of that doesn't require complex RF design is to use a FPGA with a fast SERDES block.

That TI chip, while quite interesting, can only go down to 12ns.

--- End quote ---
I am not sure where you get this from, the datasheet says under application information "measurement range of 0.25ns to 8ms and accuracy of 28ps" and "single shot resolution of 55ps"
Edit: Scrolling down I see now  :palm:, they manage the shorter pulse width but with a pre-trigger you have to generate yourself....

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