A SINGLE-CHIP OPTICAL SENSOR WITH ANALOG MEMORY FOR MOTION DETECTION

A 64 x 64-pixel image sensor with full-frame analog memory and on-chip motion processor is presented, The processor consists of a charge amp lifier and an analog subtractor. It uses the switched-capacitor techni que and calculates the difference between the values of the signal on each pixel in successive frames, The rate can achieve up to 60 frames/ s with limited area and power overhead, The analog memory required for the storage of the previous frame is implemented using implanted capa citors placed within the sensor array, Fabricated in a 1.2-mu m standa rd CMOS process with an added metal 3 light-shielding layer, the circu it is fully functional and requires a total core area of 13 mm(2).