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In this paper, we propose and demonstrate an implantable CMOS image sensor with self-resetting pixels. The self-resetting function is implemented using a four-transistor Schmitt trigger inverter. The pixel has no counter for the number of self-resets, because the application does not require radiometric (linear) response. The pixel is fabricated using the 0.35-$\mu \text{m}$ 2-poly 4-metal standard...
We developed and evaluated a miniaturized CMOS image sensor with self-reset function in order to improve signal-to-noise ratio (SNR) of an implantable imaging device. The sensor is capable to image under high intensity illumination where the peak SNR determined by the shot-noise is increased. The pixel size is 15-μm square, which is as small as neural cells and acceptable for implantable image sensor...
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