Abstract
Our goal of research is to achieve a low voltage and low power consumption CMOS image sensor for biomedical applications. We develop the image sensor using pulse-width-modulation scheme that converts voltage change at the photodiode to the pulse width by use of an in-pixel gate-common amplifier. In the previous work we have successfully demonstrated the operation of the PWM sensor with 128^H×96^V pixels under 1.35-V single supply voltage. In this report, we describe some design considerations and formulated about IR drop effect of the PWM sensor. We have designed and fabricated a a CIF (368^H×320^V pixels) size CMOS image sensor with low-voltage low-power-consumption using the PWM pixel readout scheme under 1.2-V single-power-supply voltage.
