Superconducting analog-to-digital converter with bidirectional c

Details Superconducting analog-to-digital converter with bidirectional c Superconducting analog-to-digital converter with bidirectional c

1987-02-19

1990-05-01

Shoop, Jr., William M.

Coded data generation or conversion

Analog to or from digital conversion

With particular solid state devices

341164, 341171, H03M 112

Patent

active

049222503

ABSTRACT:
An analog-to-digital converter quantizer and bidirectional counter using superconducting quantum interference devices (SQUD's) as the principal elements. A double-junction non-latching SQUID is used as a quantizer to produce unipolar output pulses on two different output lines, indicative of positive and negative increments of change in an analog signal current. The unipolar pulses are then counted in a bidirectional counter that employs double-junction non-latching SQUID's as counter stages and as logic gates for the propagation of carry and borrow signals from stage to stage.

REFERENCES:
patent: 3263097 (1966-07-01), Noble
patent: 3983419 (1976-09-01), Fang
patent: 4315255 (1982-02-01), Harris et al.
patent: 4551704 (1985-11-01), Anderson
patent: 4672359 (1987-06-01), Silver
Hamilton "100 GHz Binary Counter Using Squid Flip Flops" IEEE Transactions on Magnetics, vol. MAG-19, No. 3, May 1983, pp. 1291-1292.
Hamilton "Analog Measurement Applications for High Speed Josephson Switches" IEEE Trans. on Magnetics, vol. MAG-17, No. 1, Jan. 1981, pp. 577-582.
Herrell "IBM Technical Disclosure Bulletin" vol. 17, No. 10, Mar. 1975, pp. 3049-3050.

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