K
Koichi Hamashita
Researcher at Oregon State University
Publications - 45
Citations - 1005
Koichi Hamashita is an academic researcher from Oregon State University. The author has contributed to research in topics: Delta-sigma modulation & CMOS. The author has an hindex of 16, co-authored 44 publications receiving 892 citations.
Papers
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Journal ArticleDOI
Ring amplifiers for switched-capacitor circuits
TL;DR: In this paper the fundamental concept of ring amplification is introduced, and a basic operational theory is established, and the core benefits of this technique are identified.
Journal Article
A Stereo 16-Bit Delta-Sigma A/D Converter for Digital Audio
David R. Welland,Bruce P. Del Signore,Eric J. Swanson,Tadashi Tanaka,Koichi Hamashita,Susumu Hara,K. Takasuka +6 more
Journal ArticleDOI
A 0.6-V 82-dB delta-sigma audio ADC using switched-RC integrators
Gil-Cho Ahn,Dong-Young Chang,Matthew E. Brown,Naoto Ozaki,Hiroshi Youra,Ken Yamamura,Koichi Hamashita,K. Takasuka,Gabor C. Temes,Un-Ku Moon +9 more
TL;DR: A 0.6-V 2-2 cascaded audio delta-sigma ADC using a resistor-based sampling technique which achieves high linearity and low-voltage operation without subjecting the devices to large terminal voltages is described.
Journal ArticleDOI
A Noise-Coupled Time-Interleaved Delta-Sigma ADC With 4.2 MHz Bandwidth, ${-}$ 98 dB THD, and 79 dB SNDR
Kyehyung Lee,Jeongseok Chae,M. Aniya,Koichi Hamashita,K. Takasuka,S. Takeuchi,Gabor C. Temes +6 more
TL;DR: This paper describes a wideband high-linearity ADC that uses noise coupling combined with time interleaving to increase the effective order of the noise-shaping loops, provides dithering, and prevents tone generation in all loops.
Journal ArticleDOI
LMS-Based Noise Leakage Calibration of Cascaded Continuous-Time $\Delta\Sigma$ Modulators
TL;DR: In cascaded ΔΣ modulators (DSMs), the quantization noise of the earlier stage leaks to the output unless completely cancelled by the digital noise cancellation filter (NCF), so a parameter-based continuous-time to discrete-time transform is developed to get an exact digital NCF.