Takahashi Tokuda

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— For wide dynamic range, compatibility with digital circuits, and low-voltage operation, the pulse modulation technique is suitable for an implanted bioimage sensor. We demonstrate bio-fluorescence imaging of the hippocampus in a sliced mouse brain using a pulse modulation-based image sensor. The sensor architecture and system configuration are discussed.(More)
We have developed an on-chip image sensor with target applications of on-chip biomolecular and neural imaging. The sensor pixel can sense not only intensity of incident light, but also on-chip electric potential. The light shield structure on the pixel circuit was used as a sensing electrode. Once the passivation layer on the sensing electrode was removed,(More)
We present a CMOS image sensor device for neural imaging and interfacing. The sensor device is post-processed using MEMS microfabrication technique to enable backlit illumination. Pt electrodes are formed on the device for electrical stimulation of neurons. A specially developed packaging technique, which includes a color filter that increases the(More)
—A CMOS image sensor which is capable to simultaneously sense an optical and an op-chip potential image was designed and fabricated. The sensor was designed with target applications to sense neural activities and DNA spots in on-chip configuration. We designed compatibly configured light sensing pixel and potential sensing pixel. The pixel size is 7.5 µm. A(More)
In this presentation, we demonstrate a pulse-frequency-modulation (PFM)-based retinal stimulator for sub-retinal implantation using standard CMOS technology with low voltage operation of 1.2 V. A PFM-based photosensor converts input light intensity to electrical pulse trains whose frequency is proportional to the input light intensity. To employ simple(More)
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