As I understand the way ISO boosting works in a digital sensor, is that the voltage coming from each pixel is boosted (or suppressed) by an analog amplifier. So, for example, if the native sensitivity of the sensor is 100 ISO and the photographer asks for 400 ISO, then the voltage is amplified 4X before being sent to the ADC.
So, my question is whether there is one such amplification circuit for every pixel, or is there only one circuit and the output from each pixel is sent to the circuit in turn, or middle-of-the-road, is there a bank of amplifiers and pixels are sent in rows or columns to the amplification bank?
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