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18 May 1988 Superconductive Wideband Analog Signal Correlator With Buffered Digital Output
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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.
© (1988) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
J. B. Green, A. C. Anderson, and 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);


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