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There are several concepts and issues going on here that are getting mixed together. First the ADC; An ADC (Analog To Digital Convertor) takes signal values in a certain range and converts then to a digital number. Let's run some numbers: A N bit ADC will be able to represent 2^N states. So a 4 bit ADC can represent 16 distinct states, 8 bits => 256 ...


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Very simply, some fraction (usually 50-80%) of photons impacting each pixel on the CCD will result in an electron being excited out of the photoactive silicon layer and adding to the charge on a capacitor associated with that pixel. As the number of photons increases, so does the charge on each capacitor, in an approximately linear way. When the CCD is ...


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ADCs - analog to digital converters. Consists usually from several "more-or-less" units, called "comparators". Usually comparators compare electrical current. No, this current is not accurately correspond to number of photons which drop on ccd device. CCD matrix is complex system which works as "multiplyer" device. Many p-n layers are used which are ...



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