High sensitivity superconductive digitizer

Details High sensitivity superconductive digitizer High sensitivity superconductive digitizer

1992-07-22

1993-12-21

Hoff, Marc S.

Coded data generation or conversion

Analog to or from digital conversion

With particular solid state devices

341171, H03M 100

Patent

active

052724794

ABSTRACT:
A high-sensitivity superconductive digitizer (10) which utilizes a dc superconducting quantum interference device (SQUID) (38) to convert an input current or magnetic flux into a frequency signal which is converted by a counter (60) into a digital representation of the input. This measurement requires that the SQUID (38) be operated in a linear region of its periodically varying output. To insure locking the system into a fixed point in the periodic signal, a digital flux-locked loop is employed which utilizes a digital integrator (70) and digital to analog converter (72) in a feedback loop. A waveform generator (46) produces a dithering modulation waveform in the SQUID (38) and an up-down counter (60) finds difference signals between alternating waveforms. This difference signal is then fed to a digital integrator (70) and converted to analog by a digital to analog converter (72) and fed back to the SQUID in a feed-back loop to lock the SQUID (38) to a fixed operating point.) The analog to digital converter (10) of the present invention offers very high sensitivity with low power dissipation and very high speed.

REFERENCES:
patent: 4672359 (1987-06-01), Silver
patent: 4879488 (1989-11-01), Silver
patent: 5012243 (1991-04-01), Lee
patent: 5019818 (1991-05-01), Lee

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