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Extension to a possible PSEC5 comparator• Sacrifice some linearity (adds to off‐line calibrations)• Keep dynamic range (via decent current source), add power‐
on enable through current source
Extension to a possible PSEC5 comparator
• Quick parametric simulation with 2 microsecond ramp: comparator responds for all values 0.1 V ‐> 1.1 V.
• With a drive current of 1 microAmp (perhaps could be increased to help low‐end performance)
• Add simple digital buffering stage for rail‐to‐rail restoration (could be in ADC block)
Cap + voltage reset
Layout ideas: • storage cap is MIM cap, which is on top 3 metal layers. • For ~100fF, the size is ~60 sq. microns. Comparator and other logic can be placed
underneath, keeping footprint of storage cell to roughly the size of the cap. (Need to find optimum capacitance!)
• So total size of storage array 128*256*60 sq. microns ~ 2 sq mm per channel = feasible!
Switch toggled by write address