Hello,
I would like to design a transimpedance amplifier for a photodiode and although I have been studying the theory behind it for a while now, I am still trying to understand some concepts.
The aim of the project is to measure the current of a photodiode similar to S2592-03 http://www.hamamatsu.com/resources/pdf/ssd/s2592-03_etc_kspd1003e.pdf
I have these questions :
1. Which value of the datasheet shows the maximum current of the photodiode?
2. Regarding the bandwidth of the amplifier:
The datasheet gives the rise time of the photodiode as 0.2usec.
Taken into consideration that:
The bandwidth of the photodiode, f3dB, and the 10 - 90% rise-time response, tr, are determined from the diode capacitance Cj, and the load resistance RL:
f3dB = 1/(2*pi*RL*Cj)
tr = 0.35/f3db - [ http://course.ee.ust.hk/elec509/notes/Lect12-photodiode%20detectors.pdf (page 36/80) ]
the bandwidth of the photodiode is caclulated as: f3dB = 0.35/0.2usec = 1.75MHz.
Should the bandwidth of the transimpedance amplifier be 1.75MHz as well? If not how much should it be and why?
Thank you.
Regards,
Theodora