A/D converters

Details A/D converters A/D converters

1988-10-21

1990-07-10

Shoop, Jr., William M.

Coded data generation or conversion

Analog to or from digital conversion

Analog to digital conversion

341163, 505827, H03M 138

Patent

active

049409832

ABSTRACT:
A successive approximation analog to digital converter including at least one superconducting loop (FIG. 3-30; FIG. 8-68). Superconducting loops (61-64) may be used to store flux quanta used as reference levels in a digital to analog converter of the analog to digital converter. Alternatively, non-superconducting reference inductors (FIG. 3-38) can provide flux quanta reference levels. Switchable screens (34; 66) are interposed between the flux quanta stores and lobes (31; 74) in an addition/subtraction superconducting loop (30; 68). An analog signal is sampled and the corresponding magnetic flux coupled to a sensing lobe (32; 71) and concentrated at a flux concentrating lobe (33; 72). The reference fluxes are selectively coupled into the addition/substraction superconducting loop until a magnetometer (40;73) indicates zero net flux through the concentrating lobe, this corresponding to completion of the conversion.

REFERENCES:
patent: 3983419 (1976-09-01), Fang
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patent: 4315255 (1982-02-01), Harris et al.
patent: 4504153 (1985-03-01), Schollmeyer et al.
patent: 4672359 (1987-06-01), Silver
patent: 4682299 (1987-07-01), McIntosh et al.
patent: 4695954 (1987-09-01), Rose et al.
patent: 4768177 (1988-08-01), Kehr et al.

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