18 May 1988 Superconductive Wideband Analog Signal Correlator With Buffered Digital Output
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Abstract
Analog superconductive components have been integrated to form a device capable of crosscorrelation between two wideband analog input signals. Arrays of Nb/Nb205/Pb tunnel junctions perform the mixing of delayed samples of two frequency-offset analog signals counterpropagating along a niobium tapped transmission line. The resultant mixer products from the junction array are integrated and stored in a high-Q (ft,' 600) lumped element L-C resonator tuned to the signal difference frequency. A superconductive tunnel junction imbedded in the resonator circuit is operated as a variable-threshold comparator to detect the time-integrated current stored in the resonator. We present results showing the correlation properties of such an individual correlator cell, together with the design and performance of a 4-junction-logic (4JL)-based digital address encoder to be used in a multichannel correlator device. We also discuss the important design issues as they relate to analog signal processing.
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J. B. Green, A. C. Anderson, R. S. Withers, "Superconductive Wideband Analog Signal Correlator With Buffered Digital Output", Proc. SPIE 0879, Sensing, Discrimination, and Signal Processing and Superconducting Materials and Intrumentation, (18 May 1988); doi: 10.1117/12.943980; https://doi.org/10.1117/12.943980
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