SNR Measurements for CCD vs CMOS sensors

Posted by ellencglad on Aug 16, 2022; 3:49pm
URL: http://astroimagej.170.s1.nabble.com/SNR-Measurements-for-CCD-vs-CMOS-sensors-tp1973.html

Hi,
In the paper online "ASTROIMAGEJ: IMAGE PROCESSING AND PHOTOMETRIC EXTRACTION FOR ULTRA-PRECISE ASTRONOMICAL LIGHT CURVES (EXPANDED EDITION)," I found the equation used to calculate Noise (N) that is used to compute SNR in the Measurements table.

Why does N actually decrease when System Gain increases? Is this native to CCDs or does anyone have experience with this occurring in CMOS sensors as well?

Thank you,
Ellen