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There are two components to the dark fixed pattem signal from the T series arrays. These are due to: 1) spatial variations in the switching transients coupled into the video line through the clocks and the internal multiplex switches, and 2) variation in the integrated dark current. A portion of the switching transient effect will be spatially random and a portion will have the periodicity of the clocks. The latter portion can be minimized by matching the clock amplitudes and rise and fall times and by good circuit layout to minimize capacitance between clocks and video lines. The peak-to-peak fixed pattern due to all switching transient effects should be less than l% of the saturated signal. The fixed pattem due to dark current is just the variation in dark current multiplied by the integration time. It can be arbitrarily reduced by lowering the temperature or by reducing the integra- tion time. This is not to be confused with the average dark current as shown in Figure 6.
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