Superconducting analog to digital converter
AssigneeResearch Development Corporation of Japan
InventorYutaka Harada
Life of this patent
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Abstract
A superconducting analog to digital converter comprises a plurality of comparators, each of which includes a quantum flux parametron having a superconducting loop with two Josephson devices and exciting inductors, a first load inductor connected to the superconducting loop, and means for supplying exciting current to inductors inductively coupled with said exciting inductors and an rf-SQUID comprising a superconducting loop with a second load inductor and a Josephson device, whereby an input signal is converted to a positive or negative signal by the rf-SQUID for each unit change of the input signal by the amount of the magnetic flux quantum and then the converted signal is sampled and amplified by the quantum flux parametron.
Claims10
A superconducting analog to digital converter comprising a plurality of comparators each of which includes:
- a quantum flux parametron having a superconducting loop with a first and second Josephson devices and two exciting inductors, a first load inductor connected to the superconducting loop, and means for supplying exciting current to inductors inductively coupled with said exciting inductors and
- an rf-SQUID comprising a superconducting loop with a second load inductor and a third Josephson device, whereby input signals are supplied to the quantum flux parametron through the rf-SQUID.
A superconducting comparator comprising:
- a quantum flux parametron having a superconducting loop with a first and second Josephson devices and two exciting inductors, a first load inductor connected to the superconducting loop, and means for supplying exciting current to inductors inductively coupled with said exciting inductors and
- an rf-SQUID comprising a superconducting loop with a second load inductor and a third Josephson device, whereby input signals are supplied to the quantum flux parametron through the rf-SQUID.
Dependencies are inferred from the claim text.