Superconductive wideband analog signal correlator with buffered digital output

Technical Report · Fri Jan 01 04:00:00 EST 1988

OSTI ID:6660190

Green, J B; Anderson, A C; Withers, R S

Analog superconductive components were integrated to form a device capable of cross correlation between two wideband analog input signals. Arrays of Nb/Nb/sub 2/O/sub 5//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 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. Results are presented 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. The authors also discuss the important design issues as they relate to analog signal processing.

• Research Organization: Massachusetts Inst. of Tech., Lexington (USA). Lincoln Lab.
• OSTI ID: 6660190
• Report Number(s): AD-A-197905/3/XAB; MS-7491A
• Country of Publication: United States
• Language: English

Related Subjects

420201* -- Engineering-- Cryogenic Equipment & Devices
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
CHALCOGENIDES
ELECTRONIC CIRCUITS
ELEMENTS
JUNCTIONS
LOGIC CIRCUITS
METALS
NIOBIUM
NIOBIUM COMPOUNDS
NIOBIUM OXIDES
OXIDES
OXYGEN COMPOUNDS
REFRACTORY METAL COMPOUNDS
SIGNAL CONDITIONING
SUPERCONDUCTING JUNCTIONS
SUPERCONDUCTORS
TRANSITION ELEMENT COMPOUNDS
TRANSITION ELEMENTS