Superconducting analog-to-digital converter with bidirectional counter
A superconducting analog-to-digital converter is described comprising: a double-junction superconducting quantum interference device (SQUID) having first and second Josephson junctions and a center-tapped load inductance; means for applying a constant gate current to the center of the load inductance; means for applying a bidirectionally varying analog signal current to the load inductance. Positive incremental changes in the analog signal current result in the generation of voltage pulses across the first junction, and negative incremental changes in the analog current signal result in the generation of voltage pulses of the same polarity across the section junction; and means for counting the voltage pulses generated across the first and second junctions, to determine the corresponding digital equivalents of the changes in the analog signal current.
- Assignee:
- TRW, Inc., Redondo Beach, CA
- Patent Number(s):
- US 4646060
- OSTI ID:
- 6728491
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
ANALOG-TO-DIGITAL CONVERTERS
CURRENTS
ELECTRIC CURRENTS
ELECTRIC POTENTIAL
ELECTRONIC EQUIPMENT
EQUIPMENT
FLUXMETERS
JOSEPHSON JUNCTIONS
JUNCTIONS
MEASURING INSTRUMENTS
MICROWAVE EQUIPMENT
PULSES
SIGNALS
SQUID DEVICES
SUPERCONDUCTING DEVICES
SUPERCONDUCTING JUNCTIONS