The Storage Correlator: Theory and Signal Processing Applications
STANFORD UNIV CA EDWARD L GINZTON LAB OF PHYSICS
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This report presents a complete analytic theory of the acousto- electric storage correlator, and experimental applications which demonstrate its versatility as a signal processor. Within the storage correlator, externally applied signals interact with the potentials associated with an acoustic surface wave traveling on a piezoelectric substrate. A spatially varying charge pattern is thereby stored in a linear array of semiconductor diodes. Application of a later reading signal yields the convolution or correlation of the reading signal and the stored charge pattern. A number of modes of both storing the charge pattern and reading it have been reported. The theory provides analytic predictions of the device performance for most of these modes of operation and most reported device structures. Experimental confirmation of the theory is given. Particular attention is paid to the transient characteristics of pn diodes. It is shown both theoretically and experimentally that their response is nearly equivalent to that of fast diodes e.g., Schottky diodes in this application. As a consequence, they may be charged quickly in nanoseconds and can retain their charge for long times seconds.
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