Koichi Hamashita

35 papers C 2Journal 15Unranked 18

Year	Rank	Type	Title / Venue / Authors
2021	—	`conf`	A Hybrid Continuous Time Incremental and SAR Two-Step ADC with 90.5dB DR over 1MHz BW. A-SSCC Yanchao Wang, Siladitya Dey, Tao He, Lukang Shi, Jiawei Zheng, Manjunath Kareppagoudr, Yi Zhang, Kazuki Sobue, Koichi Hamashita, Koji Tomioka, Gabor C. Temes
2020	—	`conf`	A 16b 1.62MS/s Calibration-free SAR ADC with 86.6dB SNDR utilizing DAC Mismatch Cancellation Based on Symmetry. A-SSCC Shota Konno, Yuichi Miyahara, Kazuki Sobue, Koichi Hamashita
2020	J	`jnl`	A 951-fs IEEE J. Solid State Circuits Hyuk Sun, Kazuki Sobue, Koichi Hamashita, Tejasvi Anand, Un-Ku Moon
2019	J	`jnl`	A 10-mW 16-b 15-MS/s Two-Step SAR ADC With 95-dB DR Using Dual-Deadzone Ring Amplifier. IEEE J. Solid State Circuits Ahmed ElShater, Praveen Kumar Venkatachala, Calvin Yoji Lee, Jason Muhlestein, Spencer Leuenberger, Kazuki Sobue, Koichi Hamashita, Un-Ku Moon
2019	—	`conf`	A 10mW 16b 15MS/s Two-Step SAR ADC with 95dB DR Using Dual-Deadzone Ring-Amplifier. ISSCC Ahmed ElShater, Calvin Yoji Lee, Praveen Kumar Venkatachala, Jason Muhlestein, Spencer Leuenberger, Kazuki Sobue, Koichi Hamashita, Un-Ku Moon
2018	—	`conf`	A 1.25MS/S Two-Step Incremental ADC with 100DB DR and 110DB SFDR. VLSI Circuits Takato Katayama, Shiko Miyashita, Kazuki Sobue, Koichi Hamashita
2018	J	`jnl`	An 11-Bit 250-nW 10-kS/s SAR ADC With Doubled Input Range for Biomedical Applications. IEEE Trans. Circuits Syst. I Regul. Pap. Mahmoud Sadollahi, Koichi Hamashita, Kazuki Sobue, Gabor C. Temes
2018	J	`jnl`	An Oversampling Stochastic ADC Using VCO-Based Quantizers. IEEE Trans. Circuits Syst. I Regul. Pap. Hyuk Sun, Kazuki Sobue, Koichi Hamashita, Un-Ku Moon
2017	—	`conf`	A 0.951 psrms period jitter, 3.2% modulation range, DSM-free, spread-spectrum PLL. CICC Hyuk Sun, Kazuki Sobue, Koichi Hamashita, Tejasvi Anand, Un-Ku Moon
2017	—	`conf`	A two-capacitor SAR-assisted multi-step incremental ADC with a single amplifier achieving 96.6 dB SNDR over 1.2 kHz BW. CICC Yi Zhang, Chia-Hung Chen, Tao He, Kazuki Sobue, Koichi Hamashita, Gabor C. Temes
2016	—	`conf`	A 50 MHz bandwidth 54.2 dB SNDR reference-free stochastic ADC using VCO-based quantizers. A-SSCC Hyuk Sun, Jason Muhlestein, Spencer Leuenberger, Kazuki Sobue, Koichi Hamashita, Un-Ku Moon
2016	C	`conf`	A power efficient PLL with in-loop-bandwidth spread-spectrum modulation scheme using a charge-based discrete-time loop filter. ISCAS Hyuk Sun, Kazuki Sobue, Koichi Hamashita, Un-Ku Moon
2015	—	`conf`	A 19.2-mW, 81.6-dB SNDR, 4-MHz bandwidth delta-sigma modulator with shifted loop delays. ESSCIRC Xin Meng, Jinzhou Cao, Tao He, Yi Zhang, Gabor C. Temes, Mitsuru Aniya, Kazuki Sobue, Koichi Hamashita
2014	J	`jnl`	A 14b 60 MS/s Pipelined ADC Adaptively Cancelling Opamp Gain and Nonlinearity. IEEE J. Solid State Circuits Yuichi Miyahara, Mitsuhiro Sano, Kazuo Koyama, Toshikazu Suzuki, Koichi Hamashita, Bang-Sup Song
2014	—	`conf`	A 48 fJ/CS, 74 dB SNDR, 87 dB SFDR, 85 dB THD, 30 MS/s pipelined ADC using hybrid dynamic amplifier. VLSIC Hariprasath Venkatram, Taehwan Oh, Kazuki Sobue, Koichi Hamashita, Un-Ku Moon
2013	—	`conf`	Adaptive cancellation of gain and nonlinearity errors in pipelined ADCs. ISSCC Yuichi Miyahara, Mitsuhiro Sano, Kazuo Koyama, Toshikazu Suzuki, Koichi Hamashita, Bang-Sup Song
2013	—	`conf`	Parallel gain enhancement technique for switched-capacitor circuits. CICC Hariprasath Venkatram, Benjamin P. Hershberg, Taehwan Oh, Manideep Gande, Kazuki Sobue, Koichi Hamashita, Un-Ku Moon
2012	—	`conf`	A 61.5dB SNDR pipelined ADC using simple highly-scalable ring amplifiers. VLSIC Benjamin P. Hershberg, Skyler Weaver, Kazuki Sobue, Seiji Takeuchi, Koichi Hamashita, Un-Ku Moon
2012	—	`conf`	Direct-digital modulation (DIDIMO) transmitter with -156dBc/Hz Rx-band noise using FIR structure. ESSCIRC Shuichi Fukuda, Shinji Miya, Miho Io, Koichi Hamashita, Bram Nauta
2012	J	`jnl`	Ring Amplifiers for Switched Capacitor Circuits. IEEE J. Solid State Circuits Benjamin P. Hershberg, Skyler Weaver, Kazuki Sobue, Seiji Takeuchi, Koichi Hamashita, Un-Ku Moon
2012	—	`conf`	Ring amplifiers for switched-capacitor circuits. ISSCC Benjamin P. Hershberg, Skyler Weaver, Kazuki Sobue, Seiji Takeuchi, Koichi Hamashita, Un-Ku Moon
2011	—	`conf`	A double-sampled low-distortion cascade ΔΣ modulator with an adder/integrator for WLAN application. CICC Sanghyeon Lee, Jeongseok Chae, Mitsuru Aniya, Seiji Takeuchi, Koichi Hamashita, Pavan Kumar Hanumolu, Gabor C. Temes
2011	C	`conf`	Binary Access Memory: An optimized lookup table for successive approximation applications. ISCAS Benjamin P. Hershberg, Skyler Weaver, Seiji Takeuchi, Koichi Hamashita, Un-Ku Moon
2011	J	`jnl`	Low-OSR Over-Ranging Hybrid ADC Incorporating Noise-Shaped Two-Step Quantizer. IEEE J. Solid State Circuits Omid Rajaee, Seiji Takeuchi, Mitsuru Aniya, Koichi Hamashita, Un-Ku Moon
2010	—	`conf`	A 63 dB 16 mW 20 MHz BW double-sampled ΔΣs analog-to-digital converter with an embedded-adder quantizer. CICC Jeongseok Chae, Sanghyeon Lee, Mitsuru Aniya, Seiji Takeuchi, Koichi Hamashita, Pavan Kumar Hanumolu, Gabor C. Temes
2010	J	`jnl`	An Enhanced Dual-Path DeltaSigma A/D Converter. IEICE Trans. Electron. Yoshio Nishida, Koichi Hamashita, Gabor C. Temes
2010	J	`jnl`	Design of a 79 dB 80 MHz 8X-OSR Hybrid Delta-Sigma/Pipelined ADC. IEEE J. Solid State Circuits Omid Rajaee, Tawfiq Musah, Nima Maghari, Seiji Takeuchi, Mitsuru Aniya, Koichi Hamashita, Un-Ku Moon
2010	J	`jnl`	LMS-Based Noise Leakage Calibration of Cascaded Continuous-Time Delta Sigma Modulators. IEEE J. Solid State Circuits Yun-Shiang Shu, Junpei Kamiishi, Koji Tomioka, Koichi Hamashita, Bang-Sup Song
2009	J	`jnl`	A 0.8 V, 2.6 mW, 88 dB Dual-Channel Audio Delta-Sigma D/A Converter With Headphone Driver. IEEE J. Solid State Circuits Kyehyung Lee, Qingdong Meng, Tetsuro Sugimoto, Koichi Hamashita, Kaoru Takasuka, Seiji Takeuchi, Un-Ku Moon, Gabor C. Temes
2009	J	`jnl`	A Fifth-Order G IEEE J. Solid State Circuits Yusuke Aiba, Koji Tomioka, Yuta Nakashima, Koichi Hamashita, Bang-Sup Song
2009	J	`jnl`	A Low Power Pipelined ADC Using Capacitor and Opamp Sharing Technique With a Scheme to Cancel the Effect of Signal Dependent Kickback. IEEE J. Solid State Circuits Naga Sasidhar, Youn-Jae Kook, Seiji Takeuchi, Koichi Hamashita, Kaoru Takasuka, Pavan Kumar Hanumolu, Un-Ku Moon
2009	—	`conf`	A self-calibrated 2-1-1 cascaded continuous-time ΔΣ modulator. CICC Junpei Kamiishi, Yun-Shiang Shu, Koji Tomioka, Koichi Hamashita, Bang-Sup Song
2008	J	`jnl`	A Noise-Coupled Time-Interleaved Delta-Sigma ADC With 4.2 MHz Bandwidth, -98 dB THD, and 79 dB SNDR. IEEE J. Solid State Circuits Kyehyung Lee, Jeongseok Chae, Mitsuru Aniya, Koichi Hamashita, Kaoru Takasuka, Seiji Takeuchi, Gabor C. Temes
2008	—	`conf`	A Noise-Coupled Time-Interleaved ΔΣ ADC with 4.2MHz BW, -98dB THD, and 79dB SNDR. ISSCC Kyehyung Lee, Jeongseok Chae, Mitsuru Aniya, Koichi Hamashita, Kaoru Takasuka, Seiji Takeuchi, Gabor C. Temes
2005	J	`jnl`	A 0.6-V 82-dB delta-sigma audio ADC using switched-RC integrators. IEEE J. Solid State Circuits Gil-Cho Ahn, Dong-Young Chang, Matthew E. Brown, Naoto Ozaki, Hiroshi Youra, Ken Yamamura, Koichi Hamashita, Kaoru Takasuka, Gábor C. Temes, Un-Ku Moon