Publications

Publications [日本語]

Summary

Journals (IEEE & ACM)

  1. Y. Uno, H. Qiu, T. Sai, S. Iguchi, Y. Mizutani, T. Hoshi, Y. Kawahara, Y. Kakehi, and M. Takamiya, “Luciola: a millimeter-scale light-emitting particle moving in mid-air based on acoustic levitation and wireless powering,” ACM Proc. ACM Interact. Mob. Wearable Ubiquitous Technol., vol. 1, no. 4, Article 166, Dec. 2017. [ACM Digital Library]

  2. S. Iguchi, T. Sakurai, and M. Takamiya, “A low-power CMOS crystal oscillator using a stacked-amplifier architecture,” IEEE J. Solid-State Circuits, vol. 52, no. 11, pp. 3006‒3017, Nov. 2017. [IEEE Xplore]

  3. S. Iguchi, H. Fuketa, T. Sakurai, and M. Takamiya, “Variation-tolerant quick-start-up CMOS crystal oscillator with chirp injection and negative resistance booster,” IEEE J. Solid-State Circuits, vol. 51, no. 2, pp. 496‒508, Feb. 2016. [IEEE Xplore]

  4. S. Iguchi, P. Yeon, H. Fuketa, K. Ishida, T. Sakurai, and M. Takamiya, “Wireless power transfer with zero-phase-difference capacitance control,” IEEE Trans. Circuits and Syst. I, Reg. Papers, vol. 62, no. 4, pp. 938‒947, Apr. 2015. [IEEE Xplore]

  5. S. Iguchi, A. Saito, K. Watanabe, T. Sakurai, and M. Takamiya, “Design method of class-F power amplifier with output power of -20dBm and efficient dual supply voltage transmitter,” IEEE Trans. Circuits and Syst. I, Reg. Papers, vol. 61, no. 10, pp. 2978‒2986, Oct. 2014. [IEEE Xplore]

  6. K. Mori, H. Lim, S. Iguchi, K. Ishida, M. Takamiya, and T. Sakurai, “Positioning-free resonant wireless power transmission sheet with staggered repeater coil array (SRCA),” IEEE Antennas and Wireless Propag. Lett., vol. 11, pp. 1710‒1713, 2012. [IEEE Xplore]

Conference Proceedings (IEEE)

  1. S. Iguchi, T. Sakurai, and M. Takamiya, “A 39.25MHz 278dB FOM 19µW LDO-free stacked-amplifier crystal oscillator (SAXO) operating at I/O voltage,” in IEEE Int. Solid-State Circuits Conf. (ISSCC) Dig. Tech. Papers, Feb. 2016, pp. 100‒101. [IEEE Xplore]

  2. S. Iguchi, H. Fuketa, T. Sakurai, and M. Takamiya, “92% start-up time reduction by variation-tolerant chirp injection (CI) and negative resistance booster (NRB) in 39MHz crystal oscillator,” in IEEE Symp. VLSI Circuits Dig. Tech. Papers, Jun. 2014, pp. 236‒237. [IEEE Xplore]

  3. S. Iguchi, A. Saito, Y. Zheng, K. Watanabe, T. Sakurai, and M. Takamiya, “93% power reduction by automatic self power gating (ASPG) and multistage inverter for negative resistance (MINR) in 0.7V, 9.2µW, 39MHz crystal oscillator,” in IEEE Symp. VLSI Circuits Dig. Tech. Papers, Jun. 2013, pp. C142‒C143. [IEEE Xplore]

  4. S. Iguchi, P. Yeon, H. Fuketa, K. Ishida, T. Sakurai, and M. Takamiya, “Zero phase difference capacitance control (ZPDCC) for magnetically resonant wireless power transmission,” in Proc. IEEE Wireless Power Transfer Conf. (WPTC), May 2013, pp. 25‒28. [IEEE Xplore] (Best Paper Award)

  5. S. Iguchi, A. Saito, K. Honda, Y. Zheng, K. Watanabe, T. Sakurai, and M. Takamiya, “315MHz OOK transceiver with 38-µW receiver and 36-µW transmitter in 40-nm CMOS,” in Proc. IEEE Asia-South Pacific Design Automation Conf. (ASP-DAC), Jan. 2013, pp.93‒94. [IEEE Xplore]

  6. S. Iguchi, A. Saito, K. Watanabe, T. Sakurai, and M. Takamiya, “2.1 times increase of drain efficiency by dual supply voltage scheme in 315MHz class-F power amplifier at output power of -20dBm,” in Proc. IEEE Eur. Solid-State Circuits Conf. (ESSCIRC), Sep. 2012, pp. 345‒348. [IEEE Xplore]

  7. A. Saito, K. Honda, Y. Zheng, S. Iguchi, K. Watanabe, T. Sakurai, and M. Takamiya, “An all 0.5V, 1Mbps, 315MHz OOK transceiver with 38-µW carrier-frequency-free intermittent sampling receiver and 52-µW Class-F transmitter in 40-nm CMOS, ” in IEEE Symp. VLSI Circuits Dig. Tech. Papers, Jun. 2012, pp. 38‒39. [IEEE Xplore]

Conference Proceedings (IEICE) in Japanese

  1. Y. Uno, H. Qiu, T. Sai, S. Iguchi, Y. Mizutani, T. Hoshi, Y. Kawahara, Y. Kakehi, and M. Takamiya, “Luciola: a millimeter-scale light-emitting particle moving in mid-air based on acoustic levitation and wireless powering,” in Proc. IEICE Technical Report, ICD2017-63, Dec. 2017, pp.63‒68.

  2. M. Hamamatsu, S. Iguchi, M. Takamiya, and T. Sakurai, “A consideration toward bit error rate reduction of synchronous comparator”, in Proc. IEICE General Conf., Mar. 2015, C-12-36. [CiNii]

  3. S. Iguchi, H. Fuketa, T. Sakurai, and M. Takamiya, “92% start-up time reduction by variation-tolerant chirp injection (CI) and negative resistance booster (NRB) in 39MHz crystal oscillator,” in Proc. IEICE Technical Report, ICD2014-28, Jul. 2014, pp.81‒86. [CiNii] (Outstanding Presentation Award)

  4. S. Iguchi, A. Saito, Y. Zheng, K. Watanabe, T. Sakurai, and M. Takamiya, “93% power reduction by automatic self power gating (ASPG) and multistage inverter for negative resistance (MINR) in 0.7V, 9.2µW, 39MHz crystal oscillator,” in Proc. IEICE Technical Report, ICD2013-24, Jul. 2013, pp.1‒6. [CiNii]

  5. M. Takamiya, A. Saito, S. Iguchi, K. Honda, Y. Zheng, K. Watanabe, and T. Sakurai, “A sub-50µW, 0.5V, 315MHz transceiver for wireless sensor networks,” in Proc. IEICE Technical Committee on Microwave Engineering, MW 2012-177, Mar. 2013, pp. 97‒102. [CiNii]

  6. Z. Han, H. Lim, S. Iguchi, H. Fuketa, K. Ishida, T. Sakurai, and M. Takamiya, “Improvement of distance dependence of S21 in magnetically resonant wireless power transmission,” in Proc. IEICE General Conf., Mar. 2013, BCS-1-6. [CiNii]

  7. S. Iguchi, A. Saito, K. Watanabe, T. Sakurai, and M. Takamiya, “High efficiency 315MHz transmitter with dual supply voltage scheme,” in Proc. IEICE Technical Report, ICD2012-119, Dec. 2012, pp.121‒126. [CiNii]

  8. S. Iguchi, A. Saito, K. Honda, Y. Zheng, K. Watanabe, T. Sakurai, and M. Takamiya, “An all 0.5V, 1Mbps, 315MHz OOK transceiver with 38µW carrier-frequency-free intermittent sampling receiver and 52µW class-F transmitter in 40-nm CMOS,” in Proc. IEICE Technical Report, ICD2012-55, Aug. 2012, pp.133‒138. [CiNii]

  9. S. Iguchi, A. Saito, K. Watanabe, T. Sakurai, and M. Takamiya, “315MHz, low output power, high efficiency class-F power amplifier with dual supply voltage,” in Proc. IEICE General Conf., Mar. 2012, C-12-65. [CiNii]

  10. P. Yeon, S. Iguchi, P.-H. Chen, K. Ishida, T. Sakurai, and M. Takamiya, “Design and measurement of 40mW power transceiver for magnetically resonant wireless power transmission,” in Proc. IEICE General Conf., Mar. 2012, C-12-68. [CiNii]

  11. S. Iguchi, T. Katsumoto, S. Oshima, R. Murata, H. Ebihara, and K. Wada, “Diplexer based on small-sized UWB filter using open ring resonators in LTCC substrate and SAW filter,” in Proc. IEICE General Conf., Mar. 2011, C-2-119. [CiNii]

  12. S. Iguchi, T. Katsumoto, S. Oshima, R. Murata, H. Ebihara, and K. Wada, “A study of a multiplexer based on a wideband BPF using open ring resonators in an LTCC substrate and a SAW filter,” in Proc. IEICE Tokyo regional Conf., Mar. 2011, no. 164. [IEICE] [PDF]

Patents

  1. Techniques for low-dropout (ldo) regulator start-up detection, US Patent Application 16/665,551, filed on Oct. 28, 2019. [Publicly available]

  2. Multi-mode oscillation circuitry with stepping control, US Patent 11181939, filed on Mar. 23, 2019 & granted on Nov. 23, 2021. [Publicly available]

  3. Hybrid-Controlled Clock Generation, US Patent 10454665, filed on Mar. 18, 2018 & granted on Oct. 22, 2019. [Publicly available]

  4. Oscillator Circuit, US Patent 10116261, filed on Sep. 2, 2016 & granted on Oct 30, 2018. [Publicly available]

  5. Oscillator Circuit, Japan Patent 6271605, filed on Jan. 12, 2016 & granted on Jan 12, 2018. [Publicly available]

  6. Crystal Oscillator Circuit, US Patent 9407201, filed on Apr. 17, 2015 & granted on Aug. 2, 2016. [Publicly available]

  7. Oscillation Circuit, Japan Patent 6081404, filed on May 16, 2014 & granted on Jan. 27, 2017. [Publicly available]

  8. Amplifier and transmitter, Japan Patent Application 2012-200045, filed on Sep. 12, 2012. [Publicly available]

Invited talk / Seminar

  1. “Quick start-up and low power crystal oscillator design for IoT application,” – MERIT errantry: oversea seminar tour at MIT, University of Michigan, UCLA, Stanford, and UC Berkeley, Feb. 2015.

  2. “Quick start-up and low power crystal oscillator for IoT applications,” – poster presentation at “Science plaza 2014” in NTT Basic Research Laboratories, Nov. 2014.

  3. “92% start-up time reduction by variation-tolerant chirp injection (CI) and negative resistance booster (NRB) in 39MHz crystal oscillator,” – report of “Symposium on VLSI Circuits” at IEEE Kansai Chapter Technical Seminar, Jul. 2014.

  4. “Design of ultra-low power crystal oscillator for wireless transceiver,” – seminar at Princeton University, Mar. 2014.

  5. “Design of ultra-low power wireless transceiver for short range communication,” – seminar at NXP Semiconductors, University of Twente, and IMEC Holst Centre, Mar. 2013.

  6. “Design of ultra-low power wireless transmitter with dual power supply voltage scheme,” – technology transfer to several top Japanese companies including Renesas Electronics, Fujitsu, Toshiba, SONY, Hitachi, Sharp, Panasonic, etc., Nov. 2012.

  7. “Design of ultra-low power wireless transmitter with dual power supply voltage scheme,” – seminar at Dresden University of Technology, Sep. 2012.

  8. “Design of all 0.5V low power transmitter,” – technology transfer to several top Japanese companies including Renesas Electronics, Fujitsu, Toshiba, SONY, Hitachi, Sharp, Panasonic, etc., Mar. 2012.