Design of an 8-bit Bit-Parallel RSFQ Microprocessor

Qu, Pei-Yao; Tang, Guangming; Yang, Jia-Hong; Ye, Xiaochun; Fan, Dongrui; Zhang, Zhimin; Sun, Ninghui

doi:10.1109/tasc.2020.3017527

Cited by 6 publications

(2 citation statements)

References 18 publications

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“…encoding magnetic flux. Because of its outstanding characteristics, which include a high operating frequency (∼100 GHz) and low power consumption (nW/gate), RSFQ is widely used in the field of energy-efficient and high-frequency digital applications [5][6][7][8][9][10]. Since its introduction in the 1990s, RSFQ has garnered a lot of attention and has been extensively researched by academics.…”

Section: Introductionmentioning

confidence: 99%

The dependence of operating frequency of NbN Toggle Flip-flop on parameters of NbN Josephson junctions

Shao,

Wang,

Niu

et al. 2024

Supercond. Sci. Technol.

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We performed a comprehensive investigation of the relationship between the maximum operating frequency of the NbN superconducting frequency divider and the key parameters of the NbN Josephson junction. We designed a superconducting frequency divider that uses a single NbN Josephson junction as a pulse generator, several NbN Josephson transmission lines (JTLs), an NbN Toggle Flip-flop (TFF), and a load. By comparing the bias voltage Vin of the pulse generator with the output voltage Vout of the load, we determined if the circuit was working correctly and calculated the maximum operating frequency fmax. Additionally, we employed JSICsim software for simulations to analyze the impact of key parameters of the NbN Josephson junction, such as critical current density Jc, gap voltage Vg, characteristic voltage Vc, quality factor Q, and specific capacitance Cs, on fmax. The simulation results demonstrate that fmax increases with increasing Jc and Q. Specifically when Jc exceeds 300 kA/cm2 and Q surpasses 4, the superconducting frequency divider can achieve a fmax of 1 THz. Furthermore, we successfully fabricated a superconducting frequency divider using a 10 kA/cm2 process and tested a fmax of 260 GHz, with a deviation of approximately 6% from the simulation results.

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Section: Introductionmentioning

confidence: 99%

The dependence of operating frequency of NbN Toggle Flip-flop on parameters of NbN Josephson junctions

Shao,

Wang,

Niu

et al. 2024

Supercond. Sci. Technol.

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“…When compared to semiconductor technology, rapid single flux quantum (RSFQ) circuits have the advantages of higher speed and reduced power consumption [1]. Next-generation high-performance computing [2][3][4][5], in which core processor circuits process constant streams of data at several tens of gigahertz [6][7][8][9][10][11][12], is one of the most promising uses of RSFQ technology. Demonstrating the long-term stability of the RSFQ circuit operating at high frequencies is critical for research and development toward real-world applications.…”

Section: Introductionmentioning

confidence: 99%

On-chip test vector generation and downsampling for testing RSFQ circuits

Chen¹,

Ying²,

Ren³

et al. 2022

Supercond. Sci. Technol.

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An on-chip high-frequency testing method for rapid single flux quantum (RSFQ) circuits is proposed. This method employs test vectors based on pseudo-random sequences created by an on-chip high-frequency clock generator (CG) and a linear feedback shift register with parallel outputs (LSPO). Downsamplers (DSMs) at the outputs of a circuit under test (CUT) decimate the CUT output data so that high-frequency testing can be performed at sufficiently low data rates between the CUT and room-temperature electronics. The proposed testing can continuously test the circuit at high frequency with low-cost instruments. All of the critical subsystems, including LSPO, CG, and DSM, were designed, fabricated, and successfully tested. We validated proper operation at up to 40 GHz, confirming the concept and execution.

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