Ultrafast analog to digital converters

Details Ultrafast analog to digital converters Ultrafast analog to digital converters

1988-08-24

1989-08-08

Shoop, Jr., William M.

Coded data generation or conversion

Analog to or from digital conversion

With particular solid state devices

341155, H03M 112, H01L 3922

Patent

active

048560995

ABSTRACT:
An ultrafast analog to digital converter is provided which uses Josephson devices. The converter has a plurality of Josephson junction interferometers. The output of each interferometer is a bit that forms part of a digital representation of a sampled analog signal. Each of the interferometers has an offset, with each offset being different. The bits output by the interferometers are weighted by the offsetting. The weighting of bits by offsetting rather than periodicity allows the use of interferometers which do not need to maintain periodicity over a great number of periods, and can therefore have lower internal inductance and better high speed properties.

REFERENCES:
patent: 3949395 (1976-04-01), Klein
patent: 4315255 (1982-02-01), Harris et al.
patent: 4551704 (1985-11-01), Anderson
W. Anacker, "Analog-To-Digital Converter Using Josephson Tunneling Circuits", IBM TDB, vol. 17, No. 4 (Sep. 1974), pp. 1237-1237A.
F. F. Fang and D. J. Herrell, "Analog-To-Digital Converter For Josephson Tunneling Memory", IBM TDB, vol. 18, No. 8 (Jan. 1976), pp. 2668-2670.

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