The detector node capacitance for the CRC463 array is
0.06 pF.
The well depth is then proportional to the actual
reverse bias voltage across the detector; q = C V. Consequently, a
detector reverse bias of
160 mV is required for a well depth of
60,000 e. Our array has an odd-even column effect which causes the
applied detector reverse bias on even columns to be lower than that on
odd columns. This means that even columns have well depths
80% smaller than odd columns.
Raw linearity curves for readout methods 2 and 3 are plotted in Figure
29 for an applied reverse bias of 600 mV. These
show that saturation becomes severe at signal levels
6500 ADU,
corresponding to a well depth of 58500 e
.
Figure 29: Raw linearity curves for readout method 2 (left) and readout
method 3 (right). The signal levels for the four output amplifiers are
plotted separately. Saturation occurs at a well depth of
6500 ADU.