IEICE Electronics Express
Online ISSN : 1349-2543
ISSN-L : 1349-2543
Volume 19, Issue 23
Displaying 1-10 of 10 articles from this issue
LETTER
  • Zhiqiang Wang, Xin Liu, Zhiqiang Li, Xiaosong Wang, Minghua Wang, Quan ...
    Article type: LETTER
    Subject area: Microwave and millimeter wave devices, circuits, and modules
    2022 Volume 19 Issue 23 Pages 20210286
    Published: December 10, 2022
    Released on J-STAGE: December 10, 2022
    Advance online publication: November 09, 2021
    JOURNAL FREE ACCESS

    This paper presents a four-way current-combining Ka-band power amplifier (PA) in 65-nm CMOS technology. A symmetrical, transmission line based four-way current combiner, together with output transformers, is used to transfer the high load impedance (4*ZL) to the desired Zopt for each power unit cell. Besides, both interstage/input flexible matching transformers and the power splitter are optimized to improve the performance. Based on the methodology mentioned above, the power amplifier demonstrates a small-signal gain of about 24.12 dB, a saturated output power of 21.56 dBm, and a peak power-added efficiency of 27.3% at 35GHz.

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  • Jialu Yin, Jia Yuan, Zhi Li, Shushan Qiao
    Article type: LETTER
    2022 Volume 19 Issue 23 Pages 20220351
    Published: December 10, 2022
    Released on J-STAGE: December 10, 2022
    Advance online publication: November 08, 2022
    JOURNAL FREE ACCESS

    This paper proposes a two-dimension half-select free 12T SRAM cell suitable for the bit-interleaving structure. The proposed cell utilizes a data-aware power-cutting method and a decoupled read port as built-in assists to enhance the write margin (WM) and read static noise margin (RSNM) separately. In addition, it realizes two-dimension half-select (HS) free via two technologies, helping bit-interleaving architecture minimize the occurrence of multi-bits soft errors effectively. First, a cross-point-activated wordline successfully isolates the HS disturb in row and column dimensions. Second, a spare pull-up PMOS improves the robustness of column-dimension HS cells, which is lacking by the previous power-cutting structures. Monte Carlo simulations based on SMIC 55nm process confirm the robustness of row and column HS cells. The 12T cell supports a minimum VDD of 0.4V with the proposed methods, 0.3V less than the 6T cell. It improves the WM and RSNM by 2.9× and 14.17× compared to the 6T cell at 0.4V. Meanwhile, it reduces the write power consumption, read power consumption, and leakage power consumption by 52.2%, 4.5%, and 27.7%, respectively, than Chang10T cell at 0.7V.

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  • Yaogan Liang, Bang Du, Kohei Nakamura, Shengwei Wang, Bunta Inoue, Yut ...
    Article type: LETTER
    Subject area: Devices, circuits and hardware for IoT and biomedical applications
    2022 Volume 19 Issue 23 Pages 20220363
    Published: December 10, 2022
    Released on J-STAGE: December 10, 2022
    Advance online publication: October 27, 2022
    JOURNAL FREE ACCESS

    Retinal prosthesis is a promising treatment for vision degeneration. However, clinical experiments show that the patients can only recognize several grayscales at low resolution with electrical stimulation. This paper proposes a retinal prosthesis chip with binarization and edge detection functions to maximize the brightness difference and reduce redundant information. The binarization operation is designed as a column-parallel processing element for saving space. Moreover, the fill factor achieves 50.79% by separating the sensor and stimulator into different chips. Finally, the SPICE simulator verified the effectiveness of the proposed circuit, which achieves an FoM of 110nW/(frame·pixel).

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  • Jincheng Zhou, Xuetian Wang, Le Zou
    Article type: LETTER
    Subject area: Electromagnetic theory
    2022 Volume 19 Issue 23 Pages 20220405
    Published: December 10, 2022
    Released on J-STAGE: December 10, 2022
    Advance online publication: October 20, 2022
    JOURNAL FREE ACCESS

    A hybrid algorithm method for predicting the shielding effectiveness (SE) of apertured enclosure with an arbitrary inner window was proposed. By applying the concept of electromagnetic topology, equivalent circuit models of the enclosures are derived. The equivalent impedance of the arbitrary inner windows are calculated by a full-wave method. Then, the shielding effectiveness can be obtained using the extended BLT equation. Compared with full wave numerical simulation, the proposed method can reduce the computation time from 1000 seconds to 100 seconds while maintaining a very close accuracy.

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  • Ryotaro Kudo, Koutaro Hachiya, Toshiki Kanamoto, Atsushi Kurokawa
    Article type: LETTER
    Subject area: Devices, circuits and hardware for IoT and biomedical applications
    2022 Volume 19 Issue 23 Pages 20220419
    Published: December 10, 2022
    Released on J-STAGE: December 10, 2022
    Advance online publication: September 30, 2022
    JOURNAL FREE ACCESS

    Wireless charging technology is built into a variety of devices. However, each of these products use a dedicated wireless charger, so when it comes to making better organizational use of space, being able to charge various devices with one transmitter is desirable. In this letter, we propose a Bernoulli spiral coil transmitter that can efficiently charge smart devices of various sizes. Our analysis shows that the proposed transmitter can maintain a certain coupling coefficient even when the diameter of the receiver coil is small, compared with the conventional Archimedean spiral coil transmitter. In other words, even if the diameter is small, the output power and power transfer efficiency of the proposed transmitter are higher than those of the conventional transmitter.

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  • Minxuan Li, Qingkai Wu, Zhongchao Lin, Yu Zhang, Xunwang Zhao
    Article type: LETTER
    Subject area: Electromagnetic theory
    2022 Volume 19 Issue 23 Pages 20220420
    Published: December 10, 2022
    Released on J-STAGE: December 10, 2022
    Advance online publication: October 18, 2022
    JOURNAL FREE ACCESS

    An efficient distributed adaptive locally implicit scheme for the discontinuous Galerkin time-domain method is proposed in this letter. In comparison to the traditional methods, the proposed method employs an adjustable time scale to adaptively reduce storage and computational complexity. The implicit and explicit regions are distributed into the local storage of nodes to achieve load balance between them. Numerical results demonstrate the effectiveness of this method and confirmed that it can be used for the fast transient simulation of resonance models.

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  • Tao Hu, Bowei Zhang, Kuo Zhao, Yang Wang, Jie Zhang
    Article type: LETTER
    Subject area: Electromagnetic theory
    2022 Volume 19 Issue 23 Pages 20220434
    Published: December 10, 2022
    Released on J-STAGE: December 10, 2022
    Advance online publication: October 25, 2022
    JOURNAL FREE ACCESS

    The bit error rate of data signal (data BER) of a key-based physical layer authentication (PLA) scheme suffers from a non-negligible performance loss, mainly caused by the authentication tags taking power from data symbols and interfering with the data demodulation. Considering the orthogonality among different orbital angular momentum (OAM) modes, in this paper, an OAM-assisted PLA (OAM-PLA) scheme is proposed to improve the performance of data BER. The data BER of the proposed OAM-PLA scheme over the Rician fading channel has better performance than the conventional PLA scheme.

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  • Junjie Yu, Hao Li, Ruijunjie Cheng, Jingyu Liu, Yao Li
    Article type: LETTER
    Subject area: Electromagnetic theory
    2022 Volume 19 Issue 23 Pages 20220435
    Published: December 10, 2022
    Released on J-STAGE: December 10, 2022
    Advance online publication: November 01, 2022
    JOURNAL FREE ACCESS

    The stator winding terminal insulation of inverter-fed machine is subjected to a higher risk of premature insulation breakdown. To quantitatively evaluate the terminal insulation degradation of the machine, this paper proposes a novel data-driven method using enhanced switching oscillation signals. Different from traditional methods, which require accurate high-frequency modeling, this paper aims to automatically learn fault features and predict the degrees of terminal insulation degradation. First, the original switching oscillation signals are reconstructed by wavelet packet analysis for insulation-sensitive feature enhancement. Then, a one-dimensional convolutional neural network (1DCNN) regression is established to extract state information from the enhanced switching oscillation signals and evaluate the terminal insulation capacitance. The experimental results show that the proposed method can evaluate the winding terminal insulation capacitance with high precision of pF level.

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  • Xinlei Yang, Zhihao Zhang, Hailiang Liu, Gary Zhang, Tong Wang, Yang H ...
    Article type: LETTER
    Subject area: Microwave and millimeter wave devices, circuits, and modules
    2022 Volume 19 Issue 23 Pages 20220454
    Published: December 10, 2022
    Released on J-STAGE: December 10, 2022
    Advance online publication: October 27, 2022
    JOURNAL FREE ACCESS

    A K-band low noise amplifier (LNA) with low and flat noise figure (NF) is proposed in this letter. The LNA is designed as the first stage of an RF receiver in a frequency modulated continuous wave (FMCW) multiple-in multiple-out (MIMO) radar system for marine vessel monitoring and airspace unmanned aerial vehicle (UAV) monitoring. The multi-antenna structure at the receiving end of the MIMO radar implies higher sensitivity. The LNA is fabricated using a 100-nm GaN high electron mobility transistor (HEMT) process with a chip area of 2.2mm2. By analyzing the noise equivalent circuit model of a GaN-on-Si HEMT and optimizing the matching network, the proposed LNA achieves a measured average gain of 17.2dB, an NF of 2.0-2.3dB over the frequency range from 18 to 22.5GHz. With a power sweep measurement, this LNA achieves an P1dB of 10.5dBm and an OIP3 of 19dBm at 20GHz. The DC consumption is 220mW under 5V power supply.

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  • Yuxin Liu, Jingchang Nan
    Article type: LETTER
    Subject area: Microwave and millimeter wave devices, circuits, and modules
    2022 Volume 19 Issue 23 Pages 20220458
    Published: December 10, 2022
    Released on J-STAGE: December 10, 2022
    Advance online publication: November 01, 2022
    JOURNAL FREE ACCESS

    An ultra-wideband low noise amplifier (LNA) is designed based on a uniform distributed topology using 0.25µm GaAs pseudomorphic high electron mobility transistor (pHEMT) process. In order to increase the amplifier’s high frequency gain and gain flatness and consequently widen its bandwidth, the design proposed a new multi-inductor matching technique based on cascode structure. According to the actual measurement, the circuit adopts a +5V power supply, and the current is about 86mA. The bandwidth coverage is 2-18GHz, the noise figure is less than 3.5dB, the power gain is greater than 18dB, and the gain flatness is ±1dB, which has excellent input and output standing waves, and the saturated output power is greater than 17dBm, and the chip area is 3.1mm*1.3mm.

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