A CMOS optical-comparator-based velocity and direction motion sensor

In this paper, a CMOS optical-comparator-based velocity and direction motion sensor is newly proposed. Without using complicated calculation as performed by DSP, the proposed chip is attractive due to the fact that the proposed method is low-cost, and easier to be implemented. The chip area is 1.47 × 1.49 mm². The simulated lightness range is from 100 pA to 3 nA. All the functions and performance of the proposed CMOS optical-comparator-based velocity and direction motion sensor are successfully tested and proven through SPICE simulations. The proposed chip is suitable for devices of detecting the speed and direction of objects.