First-authored papers
[1] S. Lee, S. Amakawa, N. Ishihara, and K. Masu, “2.4–10GHz low-noise injection-locked ring voltage controlled oscillator in 90 nm complementary metal oxide semiconductor,” Japanese Journal of Applied Physics, Vol. 50, No. 4, 04DE03, Apr. 2011.
[2] S. Lee, H. Ito, S. Amakawa, S. Tanoi, N. Ishihara, and K. Masu, “1.2–17.6GHz ring-oscillator-based phase-locked loop with injection locking in 65 nm complementary metal oxide semiconductor,” Japanese Journal of Applied Physics, Vol. 51, No. 2, 02BE03, Feb. 2012.
[3] S. Lee, N. Kanemaru, S. Ikeda, T. Kamimura, S. Tanoi, H. Ito, N. Ishihara, and K. Masu, “A ring-VCO-based injection-locked frequency multiplier with novel pulse generation technique in 65nm CMOS,” IEICE Transactions on Electronics, Vol. E95-C, No. 10, pp. 1589–1597, Oct. 2012.
[4] S. Lee, H. Ito, S. Tanoi, N. Ishihara, and K. Masu, “Injection-locked fractional frequency multiplier with automatic reference pulse-selection technique,” IEICE Electronics Express, Vol. 9, No. 21, pp. 1624–1629, Nov. 2012.
[5] S. Lee, T. Kamimura, S. Yonezawa, A. Shirane, S. Ikeda, H. Ito, N. Ishihara, and K. Masu, “A multi-band quadrature clock generator with high-pass-filtered pulse injection technique,” IEEE Microwave and Wireless Components Letters, Vol. 23, No. 2, pp. 96–98, Feb. 2013.
[6] S. Lee, H. Ito, S. Amakawa, N. Ishihara, and K. Masu, “An inductorless cascaded phase-locked loop with pulse injection locking technique in 90 nm CMOS,” International Journal of Microwave Science and Technology, Vol. 2013, Article ID 584341, 2013.
[7] S. Lee, H. Ito, N. Ishihara, and K. Masu, “A novel direct injection-locked QPSK modulator based on ring VCO in 180 nm CMOS,” IEEE Microwave and Wireless Components Letters, Vol. 24, No. 4, pp. 269–271, Apr. 2014.
[8] S. Lee, S. Hara, T. Yoshida, S. Amakawa, R. Dong, A. Kasamatsu, J. Sato, and M. Fujishima, “An 80-Gb/s 300-GHz-band single-chip CMOS transceiver,” IEEE Journal of Solid-State Circuits, Vol. 54, No. 12, pp. 3577–3588, Dec. 2019. (Invited)
[9] S. Lee, S. Amakawa, T. Yoshida, S. Hara, and M. Fujishima, “A 32 Gb/s CMOS receiver with analog carrier recovery and synchronous QPSK demodulation,” IEEE Microwave and Wireless Components Letters, Vol. 31, No. 6, pp. 768-770, June 2021. (Invited)
[10] S. Lee, S. Amakawa, T. Yoshida, and M. Fujishima, “A 0.4-V 29-GHz-bandwidth power-scalable distributed amplifier in 55-nm CMOS DDC process,” IEICE Transactions on Electronics, Vol. E105-C, No. 10, pp. 561–564, Oct. 2022. (Brief Paper)
[11] S. Lee, S. Amakawa, T. Yoshida, and M. Fujishima, “A 58-%-lock-range divide-by-9 injection-locked frequency divider using harmonic-control technique,” IEICE Transactions on Electronics, Vol. E106.C, No. 10, pp. 529-532, Oct. 2023. (Brief Paper)
[12] S. Lee, K. Takano, S. Amakawa, T. Yoshida, and M. Fujishima, “A 0.6-V 41.3-GHz power-scalable sub-sampling PLL in 55-nm CMOS DDC,” IEICE Transactions on Electronics, 2023, Vol. E106.C, No. 10, pp. 533-537, Oct. 2023. (Brief Paper)
[13] To be submitted
Co-authored paper
[1] T. Kamimura, S. Lee, S. Tanoi, H. Ito, N. Ishihara, and K. Masu, “0.1 V 13 GHz transformer-based quadrature voltage-controlled oscillator with a capacitor coupling technique in 90 nm complementary metal oxide semiconductor,” Japanese Journal of Applied Physics, Vol. 51, No. 4, 04DE04, Apr. 2012.
[2] S. Ikeda, S. Lee, T. Kamimura, H. Ito, N. Ishihara, and K. Masu, “Fractionally injection-locked frequency multiplication technique with multi-phase ring voltage-controlled-oscillator,” Japanese Journal of Applied Physics, Vol. 52, No. 4, 04CE15, Apr. 2013.
[3] M. Takayasu, A. Shirane, S. Lee, D. Yamane, H. Ito, X. Mi, H. Inoue, F. Nakazawa, S. Ueda, N. Ishihara, and K. Masu, “An 8-ch, 20-V output CMOS switching driver with 3.3-V power supply for integrated MEMS devices controlling,” Japanese Journal of Applied Physics, Vol. 53, No. 4, 04EE13, Mar. 2014.
[4] S. Ikeda, S. Lee, T. Kamimura, H. Ito, N. Ishihara, and K. Masu, “A sub-1mW class-C-VCO-based low voltage PLL with ultra-low-power digitally-calibrated ILFD in 65 nm CMOS,” IEICE Transactions on Electronics, Vol. E97-C, No. 6, pp. 495–504, June 2014.
[5] S. Ikeda, S. Lee, H. Ito, N. Ishihara, and K. Masu, “0.5 V 5.8 GHz highly linear current-reuse voltage-controlled oscillator with back-gate tuning technique,” Japanese Journal of Applied Physics, Vol. 54, No. 4, 04DE06, Mar. 2015.
[6] S. Ikeda, S. Lee, H. Ito, N. Ishihara, and K. Masu, “ A 0.5V 5.96-GHz PLL with amplitude-regulated current-reuse VCO,” IEEE Microwave and Wireless Components Letters, Vol. 27, No. 3, pp. 302–304, Mar. 2017.
[7] Y. Morishita, S. Lee, T. Teraoka, R. Dong, Y. Kashino, H. Asano, S. Hara, K. Takano, K. Katayama, T. Sakamoto, N. Shirakata, K. Takinami, K. Takahashi, A. Kasamatsu, T. Yoshida, S. Amakawa, and M. Fujishima, “ 300-GHz-band OFDM video transmission with CMOS TX/RX modules and 40 dBi Cassegrain antenna toward 6G,” IEICE Transactions on Electronics, Vol. E104.C, No. 10, pp. 576-586, 2021.
[8] S. Hara, R. Dong, S. Lee, K. Takano, N. Toshida, A. Kasamatsu, K. Sakakibara, T. Yoshida, S. Amakawa, and M. Fujishima, “A 76-Gbit/s 265-GHz CMOS receiver with WR-3.4 waveguide interface,” IEEE Journal of Solid-State Circuits, Vol. 57, No. 10, pp. 2988–2998, Oct. 2022. (Invited)
[9] Z. Li, S. Lee, N. Ishihara, and H. Ito, "Low-power and high-resolution capacitance sensing using CMOS inverter-based RC oscillator by employing voltage-integration feedback," Japanese Journal of Applied Physics, Vol. 62, SC1096, 2023.
[10] S. Amakawa, R. Sugimoto, K. K. Tokgoz, S. Lee, H. Ito, and R. Kishikawa, "Signal-flow-graph analysis of weakly nonlinear microwave circuits around a large-signal operating point," IEEE Transactions on Microwave Theory and Techniques, Vol. 71, No. 9, pp. 3722–3733, Sep. 2023.
[11] Z. Li, S. Lee, N. Ishihara, and H. Ito, "RC-oscillator-based battery-less wireless sensing system using RF resonant electromagnetic coupling,” IEICE Transactions on Fundamentals of Electronics Communications and Computer Sciences, Vol. E107.A, No. 5, pp. 727-740, May 2024.
[12] Submitted
[13] Submitted
[14] To be submitted
Pre-print papers
[1] S. Amakawa, R. Sugimoto, K. K. Tokgoz, and H. Ito, "Signal-flow-graph analysis of weakly nonlinear microwave circuits around a large-signal operating point," TechRxiv, Apr. 2022.