Showing papers by "Takashi Tokuda published in 2000"
TL;DR: In this paper, a GaN/GaN system was applied to a wafer fusion for the first time, where surface smoothness and a large weighting pressure were essential to achieve both a uniform interface and better reproducibility.
Abstract: The wafer fusion technique is applied to a GaN/GaN system for the first time. The processing conditions for successful wafer fusion are clarified. The lowest annealing temperature for successful fusion of GaN/GaN is 500°C. It is found that surface smoothness and a large weighting pressure are essential to achieve both a uniform interface and better reproducibility. The electric property of the fused interface is also characterized. Current–voltage (I–V) characteristics of the n-GaN/n-GaN and p-GaN/p-GaN fused interface reveal that a pinning effect of the Fermi level exists at the fused interface.
15 citations
01 May 2000
TL;DR: Novel types of vision chips that utilize pulse trains for image processing using 1.2 µm double-metal double-poly CMOS process based on a pulse width modulation and a pulse frequency modulation are proposed.
Abstract: This paper proposes and demonstrates novel types of vision chips that utilize pulse trains for image processing. Two types of chips were designed using 1.2 µm double-metal double-poly CMOS process; one is based on a pulse width modulation (PWM) and the other is based on a pulse frequency modulation (PFM). In both chips the interaction between the pixels were introduced to realize the image pre-processing. The basic experimental and simulation results are shown for the PWM and PFM chips, respectively. Also the comparison between two types is discussed.
10 citations
24 May 2000
TL;DR: A novel type of a vision chip that utilizes pulse trains for image processing based on a pulse frequency modulation technique, which is used in neurobiological systems is proposed and demonstrated.
Abstract: This paper proposes and demonstrates a novel type of a vision chip that utilizes pulse trains for image processing. The chip is based on a pulse frequency modulation (PFM) technique, which is used in neurobiological systems. Two types of chips are designed; one is a pixel TEG (test element group) chip for testing availability of PFM for image acquisition using 0.35 micrometers triple-metal double-poly CMOS process and the other is for a vision chip with inhibitory interconnections using 1.2 micrometers double-metal double-poly CMOS process. The TEG chip works well in the power supply voltage of 0.7 V and has a dynamic range of 20 dB with a power consumption of less than 1 (mu) W. The operation of the mutual inhibition in the vision chip is confirmed by simulation. Also the comparison with the other pulse modulation technique, pulse width modulation is discussed.
1 citations