The pedestal structure can be removed using a readout method which references the detector node voltage at the end of the integration to the voltage at the beginning of the integration. The detector node voltage applicable to readout method 3 is shown schematically in Figure 27.
In principle, this readout method is susceptible to electrical 1/f noise since it differences two samples separated in time by the duration of the integration. In practice, this is unlikely to be an important noise source.
This is the preferred readout method for broad band imaging because it does not imprint the pedestal pattern on the data.
The minimum readout time for this method is 0.4 sec.
Figure 25: Detector node voltage applicable to readout method 1.
Figure 26: Detector node voltage applicable to readout method 2.
Figure 27: Detector node voltage applicable to readout method 3.
Figure 28: Detector node voltage applicable to readout method 4.