Effects of parasitic capacitance in a magnetically-coupled voltage multiplier

Kiryu, Shogo; Maezawa, M.; Sasaki, Hirokazu; Hirayama, Fuminori; Shoji, Akira

doi:10.1109/77.919447

Cited by 11 publications

(6 citation statements)

References 5 publications

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“…The typical control circuit is a Josephson transmission line mutually coupled to the SQUID cells. The line can drive all cells in series [18]- [21], or divide the signal line with splitters and drive all cells in parallel [15], or use a combination of both strategies [2], [16], [17].…”

Section: Existing Rsfq Output Circuitsmentioning

confidence: 99%

Superconductor-to-Semiconductor Interface Circuit for High Data Rates

Ortlepp

Wuensch²,

Schubert

et al. 2009

IEEE Trans. Appl. Supercond.

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We present a new kind of rapid-single-flux-quantum (RSFQ) output driver together with a pseudomorphic high electron mobility transistor (p-HEMT) amplifier both operating at liquid helium temperature. The passive interconnect including the interchip connection between the RSFQ output driver and the first transistor stage of the semiconductor amplifier is the key element for signal matching and was optimized for minimizing the reflections to the RSFQ circuit. The RSFQ output driver is based on a single-flux-quantum to dc converter and a voltage doubler. The circuit is realized in the Niobium based 1 kA/cm 2 process of FLUXONICS Foundry and provides up to 438-V output voltage. We demonstrate high-speed experiments of the output driver in combination with two different semiconductor amplifier circuits at liquid helium temperature. The output voltage of a 2-Gb/s data stream was measured to be about 3.5 mV.Index Terms-Cryogenic amplifiers, high-speed interface, single-flux quantum (SFQ), superconductive electronics.

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Section: Existing Rsfq Output Circuitsmentioning

confidence: 99%

Superconductor-to-Semiconductor Interface Circuit for High Data Rates

Ortlepp

Wuensch²,

Schubert

et al. 2009

IEEE Trans. Appl. Supercond.

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“…On the other hand, operation of some RSFQ mixed-signal circuits is affected by not only the junction capacitance but also parasitic capacitance. For instance, the parasitic capacitance limits operating margins of a magnetically-coupled voltage multiplier that consists of input JTLs and output SQUIDs connected via transformers [21]. Therefore, such mixed-signal circuits should be optimized and laid out to reduce the parasitic capacitance according to the scaling rules.…”

Section: Scaling Of Circuit Parametersmentioning

confidence: 99%

Design and Operation of RSFQ Cell Library Fabricated by Using a 10-${\rm kA/cm}^{2}$ Nb Technology

Maezawa

Ochiai

Kimura

et al. 2007

IEEE Trans. Appl. Supercond.

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A 10-kA cm 2 Nb AlO Nb junction technology for rapid single flux quantum (RSFQ) integrated circuits has been developed. Modifying our standard 1.6-kA cm 2 cell library, we have implemented elementary cells used to build RSFQ digital-to-analog converters for ac voltage standard applications. The 10-kA cm 2 library cells have been fabricated by utilizing existing process tools. Correct operations of the circuits have been confirmed at low speed. The maximum operating frequencies evaluated by an average-voltage measurement technique were consistent with the scaling rules of RSFQ circuits.Index Terms-Cell library, digital-to-analog converter, high critical current density, rapid single flux quantum, superconductor integrated circuit.

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“…a 2-stage driver. The circuit was developed originally as a transmitter for chip-to-chip data communication [11] and applied to a voltage multiplier in an RSFQ digital-to-analog converter [12][13][14]. Supplementary junctions J 2 and J 7 in the JTL enhance the effective coupling between the SQUIDs and JTL, resulting in an improvement of the margins.…”

Section: Out1mentioning

confidence: 99%

Analog-to-digital converter based on RSFQ technology for radio astronomy applications

Maezawa¹,

Suzuki²,

Sasaki³

et al. 2001

Supercond. Sci. Technol.

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We are developing an analog-to-digital converter (ADC) based on rapid single-flux quantum technology for radio-astronomic spectroscopy applications where very wide bandwidth is required and relatively small resolution is sufficient. The ADC consists of periodic-flash comparators, a demultiplexer and output drivers; and is sufficiently simple to be implemented on a single chip using a conventional 2–3 μm Nb trilayer technology. A 2-bit ADC has been designed for operation at 16 GHz of the sampling frequency. All the subsystems of the ADC have been fabricated using standard 1.6 kA cm−2 Nb/AlOx/Nb technology and have been successfully tested.

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Effects of parasitic capacitance in a magnetically-coupled voltage multiplier

Cited by 11 publications

References 5 publications

Superconductor-to-Semiconductor Interface Circuit for High Data Rates

Superconductor-to-Semiconductor Interface Circuit for High Data Rates

Design and Operation of RSFQ Cell Library Fabricated by Using a 10-${\rm kA/cm}^{2}$ Nb Technology

Analog-to-digital converter based on RSFQ technology for radio astronomy applications

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