On a popular edaboard.com forum user xihuwang asks:
"need cmos image sensor expert's help
Hi ,
Anyone can teach me how to design pixel ( using pinned photodiode) and timing control, and analog process chain to get pixel bin function ( change resolution 1/4) ?
Thanks forwards !"
DPReview forum has an interesting question on whether the photon shot noise is fundamental. User Detail Man points to Encyclopedia of Laser Physics and Technology article on shot noise discussing a rarely mentioned Amplitude-squeezed Light sources that get lower intensity light variations at the expense of an increase in phase noise. That way a sub-shot-noise light can be generated. Most of the referred squeezed light papers are from 80s - sort of esoteric knowledge now.
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| Phase space representation of amplitude-squeezed light. |
Leaving aside the limitations of the squeezed light sources, the sensor QE needs to be close to 100% in order to not re-introduce the shot noise in the process of photon absorption. Anyway, it's an interesting way to push the seemingly fundamental limit.