A double junction ring oscillator based on shunted, stacked junctions

We present the design of a double junction ring oscillator, along with initial rf measurements. The ring oscillator design includes the usage of two shunted, stacked junction devices ("Stacktrons") as active switching nodes in the ring. The rf detection circuitry was designed to accommodat...

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Bibliographic Details
Published inIEEE transactions on applied superconductivity Vol. 9; no. 2; pp. 4542 - 4545
Main Authors Lomatch, S., Ruck, B., Schmitz, R., Darula, M., Kohlstedt, H.
Format Journal Article Conference Proceeding
LanguageEnglish
Published New York, NY IEEE 01.06.1999
Institute of Electrical and Electronics Engineers
Subjects
Antenna measurements
Antennas
Applied sciences
Broadband antennas
Circuits
Coupling circuits
Design for quality
Detectors
Electric circuits
Electronics
Exact sciences and technology
Finline
Finlines
Integrated circuit measurements
Oscillators
Probes
Ring oscillators
Semiconductor device measurement
Semiconductor electronics. Microelectronics. Optoelectronics. Solid state devices
Superconducting devices
Superconductivity
Switching
Synchronous
Shapiro step
Transient response
Voltage current curve
Circuit design
Cross section
Radiofrequency
Double junction
Ring oscillator
Experimental result
s parameter
Numerical simulation
Yield component
Signal detection
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Summary:We present the design of a double junction ring oscillator, along with initial rf measurements. The ring oscillator design includes the usage of two shunted, stacked junction devices ("Stacktrons") as active switching nodes in the ring. The rf detection circuitry was designed to accommodate both a detector junction for measuring Shapiro steps and a finline antenna for broadband rf. As a motivation for our study, the double junction ring oscillator allows the probe of the multiple flux quantum (MFQ) state, which is a distinct, transient dynamical state resulting from the synchronous switching of nodal junctions in the circuit. Such a state has several possible applications. We quantify the existence of the MFQ state in the ring circuit configuration with numerical simulations, including circuit margins and yield. Finally, we provide a detailed explanation of the coupling circuitry between the ring oscillator and rf detection circuitry.
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ISSN:1051-8223
1558-2515
DOI:10.1109/77.784036