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Robin Leadbeater

Fascinating technology that SPAD array. I don’t understand though why the SNR for the SPAD array shown in fig 4 is so much lower than for the CMOS camera. They say it is 50x lower and attribute it to the low 3.5% fill factor but by my calculation, that alone should only give an ~5x reduction of SNR, not 50x ie sqrt(1/0.035)