Multiplexing Techniques of Single Flux Quantum Circuit Based Readout Circuit for a Multi-Channel Sensing System

Aoki, Koichiro; Yamanashi, Yuki; Yoshikawa, Nobuyuki

doi:10.1109/tasc.2012.2230679

Cited by 4 publications

(2 citation statements)

References 13 publications

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“…Superconducting sensing systems in which the superconducting sensor array and a superconducting single flux quantum (SFQ) read-out circuit [2,3] are integrated in the low-temperature stage, have been proposed and demonstrated for various applications [4][5][6][7][8][9][10]. The number of required cables can be reduced by using signal processing and multiplexing techniques [11][12][13].…”

Section: Introductionmentioning

confidence: 99%

Evaluation of current sensitivity of quantum flux parametron

Yamanashi

Matsushima

Takeuchi

et al. 2017

Supercond. Sci. Technol.

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Current sensitivity of quantum flux parametron (QFP) was evaluated by measuring gray zone width on the basis of both circuit simulation and measurements for superconducting sensing systems composed of a superconducting sensor array and superconducting read-out and signal processing circuits. Simulation results indicate the narrow gray zone width can be obtained by decreasing inductances comprising the QFP. Moreover, both high-sensitivity and low-power operation of the QFP can be utilized by using optimized circuit parameters and the excitation 2 current that has long rise time. Gray zone width of approximately 0.5 A, which is smaller than that of the Josephson current comparator based on a single flux quantum circuit, was experimentally obtained by using the trapezoidal excitation current that has rise time of 50 s. These results indicate the QFP is promising for the read-out circuit in the superconducting sensing systems because of high-sensitivity and low-power operation.

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Section: Introductionmentioning

confidence: 99%

Evaluation of current sensitivity of quantum flux parametron

Yamanashi

Matsushima

Takeuchi

et al. 2017

Supercond. Sci. Technol.

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“…This results in a reduction in noise and thermal inflow to the lowtemperature environment, allowing the high performance of the sensor array to be fully utilized. The number of wires can be efficiently reduced further by employing a signalmultiplexing technique [6].…”

Section: Introductionmentioning

confidence: 99%

Design and Evaluation of Magnetic Field Tolerant Single Flux Quantum Circuits for Superconductive Sensing Systems

Yamanashi

Yoshikawa

2014

IEICE Trans. Electron.

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A promising application of a single-flux quantum (SFQ) circuit is read-out circuitry for a multi-channel superconductive sensor array. In such applications, the SFQ read-out circuit is expected to operate outside a magnetic shield. We investigated an SFQ circuit structure, which is tolerant to an external magnetic field, using the AIST 2.5 kA/cm 2 Nb standard 2 process, which has four Nb wiring layers including the ground plane. By covering the entire circuit using an upper Nb wiring layer called the control (CTL) layer, the influences of the external magnetic field on the SFQ circuit operation can be avoided. We experimentally evaluated the sheet inductance of the wiring layer underneath the CTL shielding layer to design a magnetic-field-tolerant SFQ circuit. We implemented and measured test circuits comprising toggle flip-flops (TFFs) to evaluate their magnetic field tolerances. The operating margin and maximum operating frequency of the designed TFF did not deteriorate with increases in the magnetic field applied to the test circuit, whereas the operating margin of the conventional TFF was reduced by applying the magnetic field. We have also demonstrated the high-speed operation of the designed TFF operated in an unshielded environment at a frequency of up to 120 GHz with a wide operating margin.

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Single-flux-quantum signal processors monolithically integrated with a superconducting nanostrip single-photon detector array

Miyajima

Yabuno

Miki

et al. 2023

Applied Physics Letters

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We developed a monolithic integration process for a superconducting nanostrip single-photon detector (SNSPD) and a cryogenic signal processor based on a single-flux-quantum (SFQ) circuit. Sixteen-pixel SNSPDs consisting of a 10-nm-thick and 100-nm-wide NbTiN nanowire were fabricated on a 3-in. Si wafer with an SFQ merger fabricated by the National Institute of Advanced Industrial Science and Technology Nb 2.5 kA/cm2 standard process 2. Subsequently, we illuminated the photons on the 16-pixel SNSPD array through an optical fiber and obtained a similar bias-current dependence of the detection efficiency with a single-pixel SNSPD without the SFQ merger. This indicates that the SFQ merger works correctly, and that the power dissipation of the SFQ circuit, which is estimated to be 200 μW, does not deteriorate the photon detection of SNSPD fabricated on the same chip with a size of 5 × 5 mm2. Furthermore, we measured timing jitter using a pulsed laser as the photon source. Owing to the careful tuning of the wiring length between each pixel of the 16-pixel SNSPD and each input port of the SFQ merger, the obtained timing jitter was 41.4 ps, which is approximately equal to or less than that of the single-pixel SNSPD.

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Multiplexing Techniques of Single Flux Quantum Circuit Based Readout Circuit for a Multi-Channel Sensing System

Cited by 4 publications

References 13 publications

Evaluation of current sensitivity of quantum flux parametron

Evaluation of current sensitivity of quantum flux parametron

Design and Evaluation of Magnetic Field Tolerant Single Flux Quantum Circuits for Superconductive Sensing Systems

Single-flux-quantum signal processors monolithically integrated with a superconducting nanostrip single-photon detector array

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