Josephson voltage standard at low drive frequencies

Meyer, H.‐G.; Kohler, Heiner; Müller, F.; Blüthner, K.; Weber, P.; Chwala, A.

doi:10.1109/77.233316

Cited by 12 publications

(4 citation statements)

References 6 publications

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“…This is due to the fact that the plasma frequency fp=9.27 GHz of that sample was not sufficiently below the driving frequency. According to the work of Meyer et al [12], fp should have been smaller than 6.6 GHz to achieve stable steps with 0.5 mV per junction. To reach this value with Nb/AlzOs/Nb-tunnel junctions the Josephson current density has to be reduced by a factor of 2 to x 3.4 A/cm2.…”

Section: B Measurements With the X-band Oscillator (10 Ghz)mentioning

confidence: 99%

Hybrid integration of microwave oscillators with Josephson series arrays for the use as voltage standards

Hebrank

Gutmann

Müller

et al. 1995

IEEE Trans. Appl. Supercond.

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We have designed and fabricated a new type of Josephson device to be hybrid integrated with microstripline oscillators. For optimum matching of the Josephson series array to the oscillator the samples make use of a new stripline design. The first circuits were fabricated in a simplified NbJA1203INb technology and exhibit excellent dc characteristics and good microwave coupling to the junctions of the array. At 70 GHz constant voltage steps up to 350 mV could be observed. By hybrid integrating different samples with a new 10-GHz oscillator, constant voltage steps were created. For this experiment the Josephson current density had to be low enough to reduce the plasma frequency of the junctions to well below the driving frequency.

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Section: B Measurements With the X-band Oscillator (10 Ghz)mentioning

confidence: 99%

Hybrid integration of microwave oscillators with Josephson series arrays for the use as voltage standards

Hebrank

Gutmann

Müller

et al. 1995

IEEE Trans. Appl. Supercond.

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“…It means that the current step amplitude and the V,,,,, were essentially limited by the chaotic states in rf-biased tunnel junctions. To avoid the chaotic states the critical current density must not exceed [3] In experiments, the highest critical current step n, , , induced by microwave power was 7 to 8 and the specific capacitance of the Nb-Al/AIO,-Nb tunnel junctions c, M 4pF/cm2. In this case the critical current density must be below 4 A/cm2 in the array I and 6 A/cm2 in the array 11.…”

Section: Fabrication and Experimental Setupmentioning

confidence: 99%

“…Worldwide, voltage standards are usually based on arrays of tunnel junctions and operated in a frequency range between 70 and 90 GHz, providing dc voltages of 1 and 10 V [l], [a]. Nevertheless, the possibility to decrease of the drive frequency is still very attractive [3], [4]. A drawback of this new approach is the necessarily large individual junction size.…”

Section: Introductionmentioning

confidence: 99%

Stacked niobium Josephson junction arrays under x-band irradiation

Клушин

Schornstein

Kohlstedt

et al. 1997

IEEE Trans. Appl. Supercond.

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Stacked Josephson junction arrays located at the rf current antinodes of a superconducting microstripline resonator were investigated.The circuits were designed t o obtain highly accurate voltages at cm-waveband microwave driving and low rf-power level. Nb-Al/AlO,-Nb Josephson junctions with tunneling area of 60 pm x 300 p m and critical current density up to 7A/cm2 were used. We compared the average voltages of the rf induced maximal current steps in arrays with up to three junctions per stack. Quantized current steps up to 300 mV were observed under microwave irradiation at frequency of 19.20 GHz in circuits with 384 three-junction stacks. The dynamics of stacked tunnel junctions in the presence of rf-currents will be discussed with respect to application as voltage standards .

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“…To reach a sufficiently large voltage output, in all national laboratories the reference voltage is derived from large-scale series arrays of Josephson tunnel junctions, most commonly driven in the 70-100 GHz range [1,2]. In a recent paper, we have reported on the generation of stable frequency-scaled voltages at the much lower X-band frequencies using a microstrip resonator with a few Josephson junctions integrated into the top layer [3].…”

Section: Introductionmentioning

confidence: 99%

Josephson voltage standard microwave circuit driven at 10 GHz

et al. 1994

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We have investigated a new type of microwave circuit for the generation of frequency-scaled Josephson voltages useful for the representation of highly accurate reference voltages. The circuit consists of a superconducting microstrip resonator and series arrays of Josephson junctions integrated within its rf current antinodes. The circuit is designed to operate at low frequencies of about 10 GHz to simplify the microwave techniques. At a resonator circuit with four Josephson junctions driven at 10.9 GHz we have obtained stable overlapping Shapiro steps up to 4.6 mV at a step width of about 70 µA. A more advanced double-resonator circuit with altogether 216 junctions allows to generate scaled reference voltages up to 0.16 V at steps of about 25 µA in width and at a microwave frequency of 11.1 GHz

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Josephson voltage standard at low drive frequencies

Cited by 12 publications

References 6 publications

Hybrid integration of microwave oscillators with Josephson series arrays for the use as voltage standards

Hybrid integration of microwave oscillators with Josephson series arrays for the use as voltage standards

Stacked niobium Josephson junction arrays under x-band irradiation

Josephson voltage standard microwave circuit driven at 10 GHz

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