A CMOS biologically expansion/contraction motion sensor and its implementation on z-motion direction/velocity detection

In this paper, a CMOS biologically expansion/contraction motion sensor and its implementation on z-motion direction/velocity detection is newly proposed. The proposed method to calculate the z-motion velocity is based on the principle of biconvex lens geometry (BLG). The proposed chip is attractive due to the fact that analog processing circuits and light sensor are integrated robustly and compactly. Different to previous work, the proposed method can be real-time to calculate the velocity of z-axis of an object. The proposed chip consists of 80 pixels, and the sensor array is divided into eight parts in different axes. The chip area is 4×4 mm². Based upon the device parameters of 0.35 μm 2P4M CMOS technology, all the functions and performance of the proposed expansion/contraction motion sensor and its implementation on z-motion direction/velocity detection are successfully tested and proven through SPICE simulations. The proposed chip is suitable for Z-motion applications, such as surveillance robot and 3D motion applications.