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A-D-converters

Magnetic recording medium

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AM Radio receiver

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A/D converters

Details

Inventors: Phillips, John A.; Dunnett, Bruce;
Assignee: Stc PLC (London, GB2)
Primary Examiner: Shoop, Jr.; William M.
Assistant Examiner: Logan; Sharon D.
Attorney, Agent or Firm: Lee, Mann, Smith, McWilliams & Sweeney

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.

DETAILED DESCRIPTION We claim: 1.
A successive approximation n-bit analogue to digital converter including an addition/subtraction superconducting loop having a sensing lobe, a magnetic flux concentrating lobe and n further lobes; a non-superconducting drive loop to which an analogue signal to be converted is applied; superconducting loops for storing n flux quanta which are used as reference levels; control circuits for selectively coupling each flux quanta reference level with a respective one of the n further lobes; means for coupling magnetic flux at the drive loop to the sensing lobe whereby the analogue signal in the drive loop is in use sampled and a corresponding magnetic flux linked to the addition/subtraction superconducting loop; and a magnetometer for detecting the magnetic flux at the concentrating lobe.
2.
A successive approximation n-bit analogue-to-digital converter comprising a superconducting loop having a sensing loop, a magnetic flux concentrating lobe and n further lobes; a non-superconducting drive loop; means for generating n reference magnetic fluxes; means for selectively coupling each reference magnetic flux with a respective one of the n further lobes; means for selectively coupling magnetic flux at the drive loop to the sensing lobe whereby a signal in the drive loop is, in use, sampled and a corresponding magnetic flux linked to the superconducting loop; and a magnetometer for detecting the magnetic flux at the concentrating lobe.
3.
An analogue-to-digital converter as claimed in claim 2 wherein said means for selectively coupling magnetic flux comprise respective superconducting screens and means for selectively rendering them non-superconducting when flux is required to be coupled.
4.
An analogue-to-digital converter as claimed in claim 2 wherein the magnetometer is a Hall effect device.
5.
An analogue-to-digital converter as claimed in claim 2, wherein the means for generating the n reference magnetic fluxes comprises a succession of superconducting circuits arranged to produce a series of n flux reference values from a single input flux value

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