| 2025 | ASPDAC | Design of 0.9-2.6pW 0.1-0.25V 22nm 2-bit Supply-to-Digital Converter Using Always-Activated Supply-Controlled Oscillator and Supply-Dependent-Activation Buffers for Bio-Fuel-Cell-Powered-and-Sensed Time-Stamped Bio-Recording. | Hiroaki Kitaike, Hironori Tagawa, Shufan Xu, Ruilin Zhang, Kunyang Liu, Kiichi Niitsu |
| 2023 | ISCAS | A Battery-Less 0.37 V 126 nW 0.29 mm | Guowei Chen, Akiyoshi Tanaka, Kiichi Niitsu |
| 2022 | ASPDAC | A 0.5 mm | Guowei Chen, Xinyang Yu, Yue Wang, Tran Minh Quan, Naofumi Matsuyama, Takuya Tsujimura, Kiichi Niitsu |
| 2019 | ASPDAC | Design of 385 x 385 μm | Kenya Hayashi, Shigeki Arata, Ge Xu, Shunya Murakami, Cong Dang Bui, Takuyoshi Doike, Maya Matsunaga, Atsuki Kobayashi, Kiichi Niitsu |
| 2019 | ASPDAC | Design of gate-leakage-based timer using an amplifier-less replica-bias switching technique in 55-nm DDC CMOS. | Atsuki Kobayashi, Yuya Nishio, Kenya Hayashi, Shigeki Arata, Kiichi Niitsu |
| 2019 | ASPDAC | A three-dimensional millimeter-wave frequency-shift based CMOS biosensor using vertically stacked spiral inductors in LC oscillators. | Maya Matsunaga, Taiki Nakanishi, Atsuki Kobayashi, Kiichi Niitsu |
| 2019 | ASPDAC | A 65-nm CMOS fully-integrated circulating tumor cell and exosome analyzer using an on-chip vector network analyzer and a transmission-line-based detection window. | Taiki Nakanishi, Maya Matsunaga, Shunya Murakami, Atsuki Kobayashi, Kiichi Niitsu |
| 2019 | ASPDAC | 2D optical imaging using photosystem I photosensor platform with 32x32 CMOS biosensor array. | Kiichi Niitsu, Taichi Sakabe, Mariko Miyachi, Yoshinori Yamanoi, Hiroshi Nishihara, Tatsuya Tomo, Kazuo Nakazato |
| 2019 | ASPDAC | A low-voltage CMOS electrophoresis IC using electroless gold plating for small-form-factor biomolecule manipulation. | Kiichi Niitsu, Yuuki Yamaji, Atsuki Kobayashi, Kazuo Nakazato |
| 2019 | ISCAS | A 65-nm CMOS 1.4-nW Self-Controlled Dual-Oscillator-Based Supply Voltage Monitor for Biofuel-Cell-Combined Biosensing Systems. | Atsuki Kobayashi, Kenya Hayashi, Shigeki Arata, Shunya Murakami, Ge Xu, Kiichi Niitsu |
| 2017 | ASPDAC | A current-integration-based CMOS amperometric sensor with 1.2 μm 2.05 μm electroless-plated microelectrode array for high-sensitivity bacteria counting. | Kohei Gamo, Kazuo Nakazato, Kiichi Niitsu |
| 2017 | ASPDAC | A scalable time-domain biosensor array using logarithmic cyclic time-attenuation-based TDC for high-resolution and large-scale bio-imaging. | Kei Ikeda, Atsuki Kobayashi, Kazuo Nakazato, Kiichi Niitsu |
| 2017 | ASPDAC | Design of an energy-autonomous bio-sensing system using a biofuel cell and 0.19V 53μW integrated supply-sensing sensor with a supply-insensitive temperature sensor and inductive-coupling transmitter. | Atsuki Kobayashi, Kei Ikeda, Yudai Ogawa, Matsuhiko Nishizawa, Kazuo Nakazato, Kiichi Niitsu |
| 2016 | ASPDAC | Design of an energy-autonomous, disposable, supply-sensing biosensor using bio fuel cell and 0.23-V 0.25-m zero-Vth all-digital CMOS supply-controlled ring oscillator with inductive transmitter. | Kiichi Niitsu, Atsuki Kobayashi, Yudai Ogawa, Matsuhiko Nishizawa, Kazuo Nakazato |
| 2014 | ISCAS | Charge-conserved analog-to-time converter for a large-scale CMOS biosensor array. | Masayuki Takihi, Kiichi Niitsu, Kazuo Nakazato |
| 2013 | ASPDAC | Design of a clock jitter reduction circuit using gated phase blending between self-delayed clock edges. | Kiichi Niitsu, Naohiro Harigai, Daiki Hirabayashi, Daiki Oki, Masato Sakurai, Osamu Kobayashi, Takahiro J. Yamaguchi, Haruo Kobayashi |
| 2012 | ASPDAC | A reference-free on-chip timing jitter measurement circuit using self-referenced clock and a cascaded time difference amplifier in 65nm CMOS. | Kiichi Niitsu, Masato Sakurai, Naohiro Harigai, Daiki Hirabayashi, Takahiro J. Yamaguchi, Haruo Kobayashi |
| 2009 | FPL | MuCCRA-Cube: A 3D dynamically reconfigurable processor with inductive-coupling link. | Shotaro Saito, Yoshinori Kohama, Yasufumi Sugimori, Yohei Hasegawa, Hiroki Matsutani, Toru Sano, Kazutaka Kasuga, Yoichi Yoshida, Kiichi Niitsu, Noriyuki Miura, Tadahiro Kuroda, Hideharu Amano |