Measuring Pixel array current GENX320

Measuring Pixel array current GENX320

Hello,

Is there a pin on the GENX320 EVK3 kit where it possible to measure the total current generated by the photodiodes of the pixel matrix ?
I'm trying to measure dark current from the pixel's photodiode. For that, the closest i got to the value of the current was via reading the value of irradiance/luminance via the LIFO. From this value, I determined the Vlog voltage via this graph from one of your publications ("A 320 x 320 1/5" BSI-CMOS stacked event sensor for low-power vision applications" ) :

Once i found an approximative value of Vlog, I started trying to determine the transfer function of the log(I/V) circuit (in green) to determine the expression of the current :

On this scheme, we can see a Iph,sum node.  From this scheme I was wondering how I could get the value of Iph,sum ?
Also, I was curious to know why you did not have a source follower configuration on the kathode of the photodiode ?

Cheers,

Michael

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