CCD Analog and Digital Correlators.
DEPARTMENT OF THE NAVY WASHINGTON DC
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A charge-coupled device CCD analog and digital correlator comprises identical modules, each of which is a simple analog CCD correlator with digital input and output. Circuits are included 1 for injecting charges proportional to the voltage sequences sn and rn, where sn refers to the input signal, and rn relates to a reference signal, against which the input signal is correlated 2 for non-destructively sensing and tapping each sample sn and rn 3 for forming the summation sn rn 4 and finally for squaring sn, rn, and sn rn in simple, floating gate MOSFET amplifiers. The amplifiers operate in their saturation region, and have outputs proportional to s sqn, r sqn, and sn rn sq, which are then fed into a differential amplifier to produce snrn.
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