IEICE Electronics Express
Online ISSN : 1349-2543
ISSN-L : 1349-2543
Volume 20, Issue 10
Displaying 1-4 of 4 articles from this issue
LETTER
  • Wenya Chen, Qingsong Cai, Zhong Yang, Shushan Qiao
    Article type: LETTER
    Subject area: Integrated circuits
    2023 Volume 20 Issue 10 Pages 20230050
    Published: May 25, 2023
    Released on J-STAGE: May 25, 2023
    Advance online publication: March 30, 2023
    JOURNAL FREE ACCESS

    In this work, a high-speed four-channel 0.8-6Gb/s wireline receiver was reported. Based on spectrum-balancing (SB) equalizer and slicer amplitude attenuator, it can be automatically adjusted to the most suitable state, avoiding the underbalanced or over-balance caused by amplitude mismatch. Moreover, a first-order semi-digital dual-loop clock and data recovery circuit (SDDCDR) with a high-speed digital loop filter (DLF) is also integrated to simplify the structure and improve the tracking ability of frequency offset. The prototype was fabricated on a 130nm CMOS process with a core area of 0.38mm2 for a single lane, consuming 97.3mW power at a 1.2V supply and tracking a 6966ppm frequency offset. In a 3m-cable test environment, the receiver sinusoidal jitter tolerance at high frequency is better than 0.22UI when 6Gb/s.

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  • Kazuhito Onodera, Hiroyuki Torikai
    Article type: LETTER
    Subject area: Integrated circuits
    2023 Volume 20 Issue 10 Pages 20230110
    Published: May 25, 2023
    Released on J-STAGE: May 25, 2023
    Advance online publication: April 12, 2023
    JOURNAL FREE ACCESS

    This study proposes a novel design method of a neuromorphic electronic circuit: design of a neuromorphic circuit based on appropriately selected hybrid dynamics of sequential logic with a single clock, sequential logic with multiple clocks, and numerical integration. Based on the proposed design method, a novel central nervous system model of C. elegans is presented. It is shown that the presented model can realize typical responses of a conventional central nervous system model of C. elegans. Furthermore, the presented model is implemented by a field programmable gate array and is used to control a prototype robot of C. elegans body. Experiments validate that the presented central nervous system model enables the body robot to reproduce typical chemotaxis behaviors of the conventional C. elegans model. In addition, comparisons show that the presented model consumes fewer circuit elements and lower power compared to various central nervous system models of C. elegans based on the sequential logics and the numerical integration.

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  • Fengjuan Wang, Zhuoyu Yang, Xiangkun Yin, Ningmei Yu, Yuan Yang
    Article type: LETTER
    Subject area: Electron devices, circuits and modules
    2023 Volume 20 Issue 10 Pages 20230116
    Published: May 25, 2023
    Released on J-STAGE: May 25, 2023
    Advance online publication: April 10, 2023
    JOURNAL FREE ACCESS

    A substrate integrated waveguide (SIW) bandpass filter with adjustable out of band transmission zeros based on through-silicon via (TSV) technology is proposed. The single-cavity degenerate mode is separated by the metal via-hole and the defect grounding structure, which is coupled with other cavities to generate transmission zeros with adjustable positions and increase the out of band roll-off rate. The results show that, the center frequency of the filter is 148GHz, the bandwidth is 6.5GHz, the minimum insertion loss is 1.4dB, and the return loss is better than 20.4dB.

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  • Dongping Xiao, Liangliang Tian, Sheng Liu, Weiguo Lu, Xin Wang, Huaiqi ...
    Article type: LETTER
    Subject area: Microwave and millimeter wave devices, circuits, and modules
    2023 Volume 20 Issue 10 Pages 20230135
    Published: May 25, 2023
    Released on J-STAGE: May 25, 2023
    Advance online publication: April 17, 2023
    JOURNAL FREE ACCESS

    This paper proposes a space search method combining the Γ-type layout of receiving antenna array of pilot signal for energy receiver positioning in MWPT systems. Based on the retrodirective technology, the spatial coordinate identification function (SCIF) of the energy receiver is generated. The study also investigates how to determine the spatial search range and search point interval. In addition, we propose a Criss-cross space search strategy (CSSS) to accelerate target positioning by summarizing the distribution features of the results obtained by SCIF. The simulation and physical experiment results demonstrate that the proposed method effectively overcomes the phase ambiguity problem and greatly improves the speed and accuracy of energy receiver positioning.

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