High speed peak detector for 1 ns peaks

Oleg Kobrin

Other Parts Discussed in Thread: OPA615

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?

over 6 years ago

0 Jacob Freet over 6 years ago

TI__Expert 8070 points

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,

0 Oleg Kobrin over 6 years ago in reply to Jacob Freet

Expert 1890 points

I emulated the following scematics with TINA:

Snd get the result:

0 Jacob Freet over 6 years ago in reply to Oleg Kobrin

TI__Expert 8070 points

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,

0 Oleg Kobrin over 6 years ago in reply to Jacob Freet

Expert 1890 points

I am waiting for a device now, so I'll check the design later.

0 Jacob Freet over 6 years ago in reply to Oleg Kobrin

TI__Expert 8070 points

Hi,

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

Regards,

0 Oleg Kobrin over 6 years ago in reply to Jacob Freet

Expert 1890 points

Sorry, next week. Right now I'm in busineess trip, but right after my return the device sample will wait me.

0 Jacob Freet over 6 years ago in reply to Oleg Kobrin

TI__Expert 8070 points

Hi Oleg,

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

Regards,

0 Oleg Kobrin over 6 years ago in reply to Jacob Freet

Expert 1890 points

No yet, sorry. I will difinitely notify you when I'll get it, which will hapend hopefully next week.

0 Jacob Freet over 6 years ago in reply to Oleg Kobrin

TI__Expert 8070 points

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,

0 kai klaas69 over 6 years ago

Guru 140200 points

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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High speed peak detector for 1 ns peaks