The 1/ f noise is dramatically reduced by the AZ and
CDS or CMS. However, it remains the dominant noise in
the readout chain [12] [3]. The critical transistors of the
column-level circuitry can be designed to have gate sizes large
enough to make their contribution to the total 1/ f noise of the
readout chain negligible compared to the in-pixel SF’s. Thus,
in a conventional low noise CIS readout chain, with column
amplification, bandwidth control and careful design, the 1/ f
noise originating from the in-pixel SF remains the dominant
noise source.