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Journal of Mechanical and Electrical Intelligent System (JMEIS, J. Mech. Elect. Intel. Syst.) An international open-access peer-reviewed journal ISSN 2433-8273
Vol.5, No.2
TABLE OF CONTENTS
Articles
Low-Cost Powered Air-Purifying Respirator (PAPR) gDistancing-Free Mask Frontline (DFM-F) Prototype No.1h for the Operational Tests in Hospitals in Cebu City, Philippines Ronald M. Galindo, Akihiro Takita, Edwin Carcasona, Ethelda Magalang, Tabetha S. Galindo, Seiji Hashimoto, Takao Yamaguchi, Edgar U. Tibay, Dongwei Shu, Haruo Kobayashi, Kenji Amagai, Naoya Ohta, Noriaki Yoshiura, Anna Kuwana, Ayako Yano, and Yusaku Fujii Journal of Mechanical and Electrical Intelligent System, Vol.5, No.2, pp.1-6, 2022. Abstract: A low-cost and comfortable PAPR with high shielding rate for aerosols, gThe Distancing-Free Mask Frontline (DFM-F) Prototype No.1h which is suitable for the test use by the medical staffs in hospitals in Cebu city, Philippines, is developed. This development is done in Cebu, Philippines under an international research collaboration project between Philippines, Singapore, and Japan researchers, in which the vaccine-independent and lockdown-free society/nation by means of spread of low-cost PAPR, is proposed and pursued. The present status and future prospect of DFM-F project in the whole DFM project are discussed.
Self-Calibration of Two Reference Voltages Ratio for Two-Step Incremental Delta-Sigma ADC Lengkhang Nengvang, Shogo Katayama, Jianglin Wei, Lei Sha, Tri Minh Tran, Anna Kuwana, Kazufumi Naganuma, Kiyoshi Sasai, Junichi Saito, Katsuaki Morishita, and Haruo Kobayashi Journal of Mechanical and Electrical Intelligent System, Vol.5, No.2, pp.7-19, 2022. Abstract: This paper describes a two-step incremental ADC using the proposed self-calibration method. For high accuracy AD conversion, the ratio of the two reference voltages which are used in the two internal DACs should be accurately known. We propose here to measure their ratio using the incremental ADC itself, and it is stored in digital memory in self-calibration mode. Then in normal operation mode, the obtained two-step digital data are corrected in digital domain based on the measured and stored voltage ratio. This can be extended to a multi-step incremental ADC. The circuit configuration, self-calibration algorithm and behavioral simulation results are shown.
Comparison of Three Types of Startup Circuits for a Self-Biasing MOS Reference Current Source Souma Yamamoto, Takashi Hosono, Takafumi Kamio, Shogo Katayama, Kuswan Isam Ebisawa, Tianrui Feng, Anna Kuwana, Haruo Kobayashi, Kouji Hirai, Akira Suzuki, Satoshi Yamada, Tomoyuki Kato, Ritsuko Kitakoga, Takeshi Shimamura, Gopal Adhikari, Nobuto Ono, and Kazuhiro Miura Journal of Mechanical and Electrical Intelligent System, Vol.5, No.2, pp.20-33, 2022. Abstract: This paper studies three startup circuits for use in our self-biasing reference current source. First, we present our proposed self-biased MOS reference current source, which is designed on TSMC 0.18µm BSIM3v3 CMOS SPICE parameters. LTspice simulations show that its output current is insensitive to temperature. Since it has two stable states, a startup circuit is required for its proper operation, i.e., a finite current flow. Therefore, we compare the three circuits in terms of chip area, power consumption, and startup operation reliability. We clarify their pros and cons, and show a guideline for selecting the startup circuit best suited for a specific application of the reference current source circuit.
Self-biasing Reference Current Source with Two Nagata Current Mirrors Insensitive to Temperature and Supply Voltage Tianrui Feng, Takashi Hosono, Souma Yamamoto, Takafumi Kamio, Shogo Katayama, Anna Kuwana, Haruo Kobayashi, Kouji Hirai, Akira Suzuki, Satoshi Yamada, Tomoyuki Kato, Ritsuko Kitakoga, Takeshi Shimamura, Nobuto Ono, and Kazuhiro Miura Journal of Mechanical and Electrical Intelligent System, Vol.5, No.2, pp.34-42, 2022. Abstract: This paper proposes a temperature and supply voltage insensitive CMOS current reference with two self-biasing Nagata current sources. They are fed-back to each other and their outputs with appropriate weights are subtracted which realizes a reference current insensitive to temperature and supply voltage. The proposed circuit is designed in TSMC 180nm process, with 3.3V supply voltage, and SPICE simulations show that it achieves a current of 22ŹA and its variation is less than 5% over the temperature range of -20 oC to 70 oC.
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