Shouhei Moriwaki

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A 0.5V, 10MHz, 9mW image processor with 320 processing element (PE) SIMD and a 32bit CPU has been developed using 40-nm CMOS. High voltage clock distribution (HVCD) reduces the number of excessive hold buffers required in a 0.5-V logic circuit design, thereby reducing the area, delay, and energy of the SIMD by 14 %, 13%, and 6%, respectively. The 0.5-V SIMD(More)
Refractive index change using quantum well intermixing (QWI) was investigated for lateral light confinement of vertical cavity surface emitting lasers (VCSELs). Refractive index change of a GaInAs/GaAs quantum well by the QWI was numerically analyzed from calculated absorption spectrum. 1% of refractive index change is expected by control of the QWI(More)
The quantum well intermixing (QWI) using a proton implantation was investigated. The PL energy shift showed peak at certain proton dose density. High In composition in QW showed increased energy shift. The proton implantation QWI showed large recovery of PL intensity in comparison with the QWI using SiO2. The QWI will be applied to the carrier confinement(More)
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