77 GHz RSFQ counter for DC Josephson voltage standard applications

Pambianchi, Michael S.; Li, Wenquan; Coughlin, J.; Talej, E.N.; Brock, D.K.

doi:10.1109/77.783940

Cited by 4 publications

(4 citation statements)

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“…In this design, all the TFF's share a common bias. The easiest way to overcome this problem is to use a separate designated bias line for the TFF closest to the LJJ oscillator [7]. The design has been changed to incorporate this improvement and modified chips are being fabricated and measured.…”

Section: Resultsmentioning

confidence: 99%

Two-phase 50 GHz on-chip long Josephson junction clock source

Vernik

Gupta

2003

IEEE Trans. Appl. Supercond.

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On-chip, high-frequency clock sources are essential for the future development of superconductor digital circuits and systems. We have developed clock sources for rapid single flux quantum (RSFQ) digital circuits using high-quality long Josephson junction (LJJ) resonant oscillators that offer extremely low jitter. To meet the requirement for time-interleaved clock signals of complementary phase, two-phase 30 and 50 GHz clock sources using LJJ's have been developed with both linear and annular geometry. Unperturbed by reflections from boundaries and collisions among the fluxons (flux quanta), the annular LJJ oscillator has demonstrated superior stability and higher quality factor (10 6) than the linear LJJ oscillator. The LJJ oscillator with linear geometry is easier to interface with RSFQ circuitry since it has well-defined boundaries at either end, facilitating a two-phase clock source. On the other hand, multiple clock phases may be derived from an annular LJJ oscillator by connecting interface circuitry at various points around the circular junction, if the interface circuitry does not interfere with the fluxon(s) in the annular junction. Experimental results for two-phase RSFQ clock sources based on linear and annular LJJ oscillators are presented. Index Terms-Long Josephson junction, on-chip high frequency clock source, superconductor digital electronics.

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Section: Resultsmentioning

confidence: 99%

Two-phase 50 GHz on-chip long Josephson junction clock source

Vernik

Gupta

2003

IEEE Trans. Appl. Supercond.

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“…This implies the necessity of using an excessively large number of junctions to reach 1 or 1OV levels. A last approach, which can avoid the use of a pulse generator, is based on rapid single flux quantum pulses amplified up to the desired voltage by a multiplier block, made using superconductive electronics based on a superconducting quantum interference device (Pambianchi et al 1999).…”

Section: Q 1 Programmable Voltage Standardmentioning

confidence: 99%

High-resistivity superconductor-normal-superconductor junctions for an AC Josephson voltage standard

Lacquaniti

Maggi

Monticone

et al. 2000

Philosophical Magazine B

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“…These single-flux-quantum ͑SFQ͒ pulses can be manipulated to make a perfect voltage multiplier. [109][110][111][112][113][114][115] Figure 15 illustrates a voltage multiplier consisting of an arbitrarily long string of cells. 111 Each of these cells consists of at least three junctions and several inductors.…”

Section: Single-flux-quantum Voltage Multipliersmentioning

confidence: 99%