Re: Transimpedence amplifier for POF photodiode
From: Paul Mathews (optoeng_at_pioneernet.net)
Date: 10/04/04
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Date: 4 Oct 2004 12:05:37 -0700
nicola.burani@libero.it (donburo) wrote in message news:<760870b.0409300752.169c9634@posting.google.com>...
> Hello everybody..
>
> I'm trying to built a simple transimpedence amplifier for a Plastic
> Optical Fibre (POF) photodiode (E05 EM PIN ST 001). I'm using an
> OPA2277 operational amplifier (+15 -15 as power supply) and a 1Mohm
> resistance as feedback. This should give me a transimpendence of app.
> 1V/uA.
> The diode is biased at 7.5V and is connected between ground and the
> non-inverting op. amp node.
> The source power I'm trying to detect is very small (nWatt app.) and
> the diode sensitivity should be around 0.5A/W.
> I should see something like some mV at the output (too small signal).
> Any Idea to make things run better????
>
> Thanks a lot....
>
> Nicola
If you're just interested in very low frequency content of signal, no
need for reverse bias across photodiode. Connect one side of
photodiode to circuit common (ground) and the other to the inverting
input of the opamp. Put additional capacitance in parallel with your
1 MegOhm feedback capacitor. Of course, this arrangement will drift
with temperature changes, so you can consider ways to cancel or
eliminate causes of drift such as dark current.
Paul Mathews
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