CCD Analog-Analog Correlator with Four-FET Bridge Multipliers

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Abstract
Design features and experimental results will be presented for a CCD-based monolithic analog-analog correlator using multipliers consisting of four MOSFET's in a bridge arrangement. Each analog input path consists of a dual-channel differential CCD with source-follower-buffered floating-gate non-destructive charge detectors. The principal advantages of this new approach are reduced sensitivity to the following sources of error in previous designs: nonlinearities in the input stage and output taps of the CCD's and in the multiplier MOSFET's; shifts in CCD bias charge level; offsets due to dark current accumulation; fixed-pattern noise due to gradual spatial nonuni formities in dark current generation; and interstage variations in threshold voltages. The balanced multiplier configuration also allows smaller, lower-power source followers to be used to buffer the floating-gate outputs.

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