Impedance Matching of Microstrip Inductors in Digital Superconductive Electronics

State-of-the-art RSFQ circuits consist of Josephson junctions, inductances and bias current sources, where the inductances are practically used as functional elements. Even more, their value defines the functionality and therefore the conventional design process requires strict conditions for the wi...

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Bibliographic Details
Published in:IEEE transactions on applied superconductivity 2009-06, Vol.19 (3), p.644-648
Main Authors: Ortlepp, T., Uhlmann, F.H.
Format: Article
Language:English
Subjects:
Applied sciences
Bit-error rate
Circuit properties
Circuits
Current sources
Digital circuits
Electric, optical and optoelectronic circuits
Electrical engineering. Electrical power engineering
Electromagnets
Electronic circuits
Electronics
Exact sciences and technology
Grounds
Impedance matching
Inductors
interconnects
Josephson junctions
Magnetic devices
Microstrip
Parasitic capacitance
Process design
Quantum capacitance
RSFQ
Semiconductor electronics. Microelectronics. Optoelectronics. Solid state devices
Simulation
Studies
superconducting devices
Superconductivity
Superconductors
timing jitter
Transformers and inductors
Various equipment and components
Wiring
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Description
Summary:State-of-the-art RSFQ circuits consist of Josephson junctions, inductances and bias current sources, where the inductances are practically used as functional elements. Even more, their value defines the functionality and therefore the conventional design process requires strict conditions for the wiring between Josephson junctions. The present design and optimization process does not take into account their parasitic capacitances to ground. This becomes an important issue for ultra fast applications above 100 GHz, but also for circuits dedicated to control quantum electronics. We report on a theoretical and experimental investigation of the influence of ground capacitances. The impedance matching between the connecting microstrip lines and the Josephson junction is a key issue for the correct operation of these circuits. We performed circuit simulations and collected experimental data of correct and incorrect operating circuits to derive design criteria. The critical reflection coefficient is found to be 0.35 and the particular design must use a smaller value for transfer and a larger value for storage of SFQ pulses, respectively.
ISSN:1051-8223
1558-2515
DOI:10.1109/TASC.2009.2019284