The potential 1/f noise problem with readout method 3 can be overcome, at the expense of two more reads, by referring both the start and end reads to their respective reset levels. The detector node voltage applicable to readout method 4 is shown schematically in Figure 28.
Naively, this should be the most accurate readout method to adopt. However, we must now delve into the more obscure operating characteristics of the CRC463 array to see why other effects dominate.