Superconductive convolver with junction ring mixers

Technical Report · Fri Mar 01 04:00:00 EST 1985

OSTI ID:5138692

Reible, S A

A superconductive convolver with tunnel-junction ring mixers was developed and demonstrated as a programmable matched filter for near 1-GHz-bandwidth chirped waveforms. A low-loss, 14-ns-long superconductive striplines circuit provides temporary storage and relative shifting of signal and reference waveforms. These waveforms are sampled by 25 proximity tap pairs and local multiplication is performed by 25 junction ring mixers. Two short transmission lines coherently sum the local products and deliver the convolution output. The output power level of the convolver was increased 18 dB by the incorporation of ring mixers and other output circuit improvements. These mixers employ series arrays of niobium/niobium oxide/lead junctions driven by delay-line taps in a quasi-balanced manner. The ring mixer provides higher-output power levels (to -58 dBm), improved suppression of undesired mixing products and higher if impedances than did the single-junction mixers used in the previous device.

• Research Organization: Massachusetts Inst. of Tech., Lexington (USA). Lincoln Lab.
• OSTI ID: 5138692
• Report Number(s): AD-A-170086/3/XAB; MS-6642
• Country of Publication: United States
• Language: English

Related Subjects

420201* -- Engineering-- Cryogenic Equipment & Devices
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
ALUMINIUM COMPOUNDS
ALUMINIUM OXIDES
CHALCOGENIDES
CORUNDUM
ELECTRONIC CIRCUITS
ELEMENTS
JUNCTIONS
LEAD
METALS
MINERALS
NIOBIUM
NIOBIUM COMPOUNDS
NIOBIUM OXIDES
OXIDE MINERALS
OXIDES
OXYGEN COMPOUNDS
REFRACTORY METAL COMPOUNDS
SAMPLING
SAPPHIRE
STORAGE
SUBSTRATES
SUPERCONDUCTING JUNCTIONS
TRANSITION ELEMENT COMPOUNDS
TRANSITION ELEMENTS
TUNNEL EFFECT