Samsung's "world's smallest" 8.4 megapixel CMOS sensor: so long CCD?

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Dan @ Jun 7th 2007 6:43AM

smaller photodiodes are more sensitive than larger ones, if a photodiode is 1/4th the size of one in another sensor, it is 4 times more sensitive, if they both receive 10,000 photos, the smaller one is more sensitive, it in reality it'll only receive 25,000 as its area is only a quarter of the larger, thus produces the same sensitivity levels, it needs have a more refined fabrication process, the CMOS process is exactly the same, in fact it IS the process for fabrication of CPUs, making smaller photodiodes is more difficult and they need to be made more identical to the ones around them to keep noise down (same with the second photo resistor).

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