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  • TI Thinks Resolved

High speed peak detector for 1 ns peaks

Good day!

I am looking for schematic for counting very narrow peaks for photon counting application. The input condition is: I got 150mV peak, 1ns wide, for each photon event and maximum peak rate is 20MHz. I'll use 80MHz TM4C MCU with edge counting mode for counting, but I need to convert 1ns 150mv peaks to 30ns 3V peaks, which will be enough for counter to work (according to MCU datasheet peak should be at high level for at least 2 MCU clocks, so 30ns wolud be enough).

Could you please suggest the cirquit for such task?

  • Hi,

    One option may be to use the OPA615 in the peak detector configuration. We have achieved a 10ns pulse peak detector with this device before and may be able to push it to 1ns. The previous design can be referenced in the post linked here: e2e.ti.com/.../167314

    I will see if I can set up a simulation with the devices that meets your requirements.

    Regards,

    Jacob Freet 
    High Speed Amplifiers

  • In reply to Jacob%20Freet:

    I emulated the following scematics with TINA:

    Snd get the result:

  • In reply to Oleg Kobrin:

    Hi,

    From what I can see, the output it looks like this circuit provides a long enough peak for you to measure. Can you elaborate on what issues you are having with this setup?

    Regards,

    Jacob Freet 
    High Speed Amplifiers

  • In reply to Jacob%20Freet:

    I am waiting for a device now, so I'll check the design later.
  • In reply to Oleg Kobrin:

    Hi,

    Just wanted to check if you had received the device or had any other questions.

    Regards,

    Jacob Freet 
    High Speed Amplifiers

  • In reply to Jacob%20Freet:

    Sorry, next week. Right now I'm in busineess trip, but right after my return the device sample will wait me.
  • In reply to Oleg Kobrin:

    Hi Oleg,

    I just wanted to follow up and see if you had a chance to look at the device yet?

    Regards,

    Jacob Freet 
    High Speed Amplifiers

  • In reply to Jacob%20Freet:

    No yet, sorry. I will difinitely notify you when I'll get it, which will hapend hopefully next week.
  • In reply to Oleg Kobrin:

    Hi Oleg,

    Just checking in again. If you would prefer, I can close this thread and then you can open a new one once you have had time to evaluate the device.

    Regards,

    Jacob Freet 
    High Speed Amplifiers

  • Hi Oleg,

    many years ago I did this with the OPA660 (diamond transistor). The application was the MIPS detection (GaAs microstrip detector experiment at CERN).

    Kai

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