I have a photodetector device that outputs charge pulses proportional to incident light. From the device's datasheet (here) and some infor provided by the manufacturer (here), I've understood that this particular device, with 900 detectors, outputs about 3.72*10^-13 Coulombs per incident photon, on top of a dark current of about 0.372-0.743 uA.
I'm reverse biasing it with about 64V, and since I only have single supplies at my disposal I've implemented a non inverting charge amplifier/integrator (here, pag.23). However, since the transfer function of this amplifier only relates input and output voltges, how can I estimate the input voltage at my amplifier? The photodetector already includes quenching resistors, but the datasheet does not specify their value. On the other hand, that amound of charge, for just 1 detector, could lead to a current pulse of about 1.24 mA if one uses the FWHM value, which I'm not sure can be used to compute this.