AnsweredAssumed Answered

I-V converter for PMT

Question asked by m1216 on May 16, 2013
Latest reply on May 24, 2013 by OliverSedlacek



My name is charles.


I'd already used the the high speed video amp(AD811 and AD8057)and ultra low input current offset amp(AD549) respectively in my simple I-V converter circuit to get a singnal from PMT(2uA max) with Rf(100Mohm). 


Although I-V converter circuit done well, signals from those amps have extra tails.


I thought that it is related to speed of amp. So I decided to change the amp has low input current offset and high bandwidth.


Now, I'm trying to order samples, AD8610, AD8651, ADA5817-1 and AD8065 for converting the current from PMT(2uA maxium) with Rf(10Mohm) to voltage.

(Not yet ordered..)


So, is it ok to use those kinds of amp(AD8610, AD8651, ADA5817-1 and  AD8065)  as a I-V converter without any tails?


Please let me know a tip or pice of advice about it.


Best regards.


P.S. The singnal frequancy from PMT is about 25MHz.

        Photon come from confocal laser scanning microscope system.