The pixels output voltage is the charge (number of photoelectrons) divided by the integrating capacitance. Reducing the capacitance increases sensitivity at the expense of full-well capacity - because the saturation voltage is reached earlier. That’s the point at which highlights blow out.
The advantage of increased sensitivity at the integration node is that all downstream noise is applied to a larger signal, so SNR is improved.
The pixels output voltage is the charge (number of photoelectrons) divided by the integrating capacitance. Reducing the capacitance increases sensitivity at the expense of full-well capacity - because the saturation voltage is reached earlier. That’s the point at which highlights blow out.
The advantage of increased sensitivity at the integration node is that all downstream noise is applied to a larger signal, so SNR is improved.