RSFQ interface circuit for the high-frequency signal output

Tarutani, Y.; Saitoh, Kazuo; Takagi, Kazumasa

doi:10.1016/s0921-4534(01)00541-x

Cited by 1 publication

(1 citation statement)

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“…The general aim of this work is the improvement of the matching between the predicted behavior based on circuit simulations and the experimental results. The influence of parasitic capacitances to ground was recently discussed for the optimization of voltage drivers [1], [2] and the impedances of microstrip lines were analysed for on-and off-chip interconnects [3], [4], respectively.…”

Section: Introductionmentioning

confidence: 99%

Impedance Matching of Microstrip Inductors in Digital Superconductive Electronics

Ortlepp

Uhlmann

2009

IEEE Trans. Appl. Supercond.

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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.

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Section: Introductionmentioning

confidence: 99%