Design of Digital DROS With SFQ Up/Down Counter for Wide Dynamic Operation Range

We designed a digital double relaxation oscillation SQUID (DROS) with an SFQ up/down counter. The DROS is connected to a feedback SQUID loop and a signal magnetic flux is input to the feedback SQUID loop. The DROS generates two kinds of voltage pulses corresponding to the total magnetic flux in the...

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Bibliographic Details
Published in:IEEE transactions on applied superconductivity 2011-06, Vol.21 (3), p.387-390
Main Authors: Myoren, H, Kimimoto, Y, Terui, K, Taino, T
Format: Article
Language:English
Subjects:
Applied sciences
Circuit properties
Digital
Digital SQUID
DROS
Dynamic range
Electric, optical and optoelectronic circuits
Electrical engineering. Electrical power engineering
Electromagnets
Electronic circuits
Electronics
Exact sciences and technology
Feedback
Frequency locked loops
Integrated circuits
Integrated circuits by function (including memories and processors)
Magnetic flux
Oscillators
Oscillators, resonators, synthetizers
Radiation detectors
Relaxation oscillations
Semiconductor electronics. Microelectronics. Optoelectronics. Solid state devices
SFQ circuit
slew rate
SQUIDs
Superconducting devices
Superconducting magnets
Superconducting quantum interference devices
Superconductivity
System-on-a-chip
up/down counter
Various equipment and components
Voltage pulses
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Summary:We designed a digital double relaxation oscillation SQUID (DROS) with an SFQ up/down counter. The DROS is connected to a feedback SQUID loop and a signal magnetic flux is input to the feedback SQUID loop. The DROS generates two kinds of voltage pulses corresponding to the total magnetic flux in the feedback SQUID loop. Two kind of voltage pulses are converted to SFQ and anti-SFQ pulses and input to the feedback SQUID loop to keep the magnetic flux in the SQUID loop constant. The number of the generated SFQ pulses is counted using the SFQ up/down counter. Thus, the count corresponds to the input magnetic flux. Because the SFQ up/down counter is operated in the pulse driven mode, the digital DROS needs only dc bias current for operation. We designed and fabricated a digital DROS with a relaxation oscillation frequency of 3 GHz and an 8-bit SFQ up/down counter. Numerical simulation suggested the designed digital DROS has a dynamic range exceeding ±100 Φ 0 and magnetic flux slew rate of 3 × 10 9 Φ 0 /s.
ISSN:1051-8223
1558-2515
DOI:10.1109/TASC.2010.2100800