Vernier for superconducting analog-to-digital converter

Details Vernier for superconducting analog-to-digital converter Vernier for superconducting analog-to-digital converter

1988-05-06

1989-11-07

Shoop, Jr., William M.

Coded data generation or conversion

Analog to or from digital conversion

Analog to digital conversion

341133, 505827, H03M 100

Patent

active

048794880

ABSTRACT:
An analog-to-digital converter employing superconducting quantum interference devices (SQUID's) to produce countable voltage pulses at uniformly spaced quantization levels, the converter having multiple SQUID quantizers, each of which receives an identical analog signal current to be converter to digital form, and a bias current to provide an offset in the position of the quantization level for each quantizer. For a quantization current of .DELTA.i, the bias currents in each of 2.sup.n quantizers are 0, .DELTA.i/2.sup.n, 2.DELTA.i/2.sup.n, and so forth up to (2.sup.n -).DELTA.i/2.sup.n. The outputs of the quantizers are monitored in associated flip-flop circuits, the states of which are sampled and decoded to yield an n-bit output that can be combined with the output of a binary counter monitoring just one of the quantizers. The quantizers provide outputs that are effectively interleaved between adjacent quantization levels of a single quantizer. This arrangement of multiple quantizers can be employed to increase the sampling rate or the resolution of the converter, without needing any improvement in the basic response time of the quantizers.

REFERENCES:
patent: 4315255 (1982-02-01), Harris et al.
patent: 4646060 (1987-02-01), Phillips et al.
patent: 4672359 (1987-06-01), Silver

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