Study On New Type CMOS Image Sensor

CMOS image sensors are applied widely in such fields as industrial, traffic, multimedia and medicine. CMOS image sensor integrates image acquisition devices and read out circuit on a chip with CMOS plane process, which has advantage of high integration and low power consumption.This paper introduced the development of CMOS image sensor, and expatiated the principle and application field of different CMOS image sensor pixel structure. Photodiode has been used as CMOS image sensor image acquisition devices.Analyses the principle of photodiode in detail, introduced different structure photodiode and its characteristic, which is compatible with CMOS process. While expatiated the integrated model principle of CMOS image sensor.Read out circuit is a critical unit of CMOS image sensor. A new type read out circuit is composed with one dynamic source follower, one capacitance for sampling and holding and one reset switch. This circuit has advantages with simple structure, acquiring related timing easily, single output, and so on. While expatiated the principle of the read out circuit, and simulated with PSpice. Shift registers are used as a select signal for pixel unit in CMOS image sensor, achieving scanning output bit after bit in the sensor. Comparing two circuits for shift register, and simulating for each one. Static shift register has advantage with nice currency, fold each other of output timings and acquiring clock signal easily.Introduced layout design rule, flow and notice. A 256 bits test device is designed by using the 1.2μm N-Well Double Poly Double Mental P substrate standard CMOS processes, giving out the layout of the pixel and whole chip, and finished the taping outDesigned the driver signal with CPLD, and tested the chip with package. Be finished the test items are curve of optical to electronic conversion, sensitivity, nonunity, saturation output voltage, dynamic range and power consumption, etc. Analyzed the tested dataIn this paper, the works have been finished such as: design and simulation of the pixel unit circuit, design and simulation of the shift and register unit circuit, design of layout and taped out, package and test the chip, analyzed the test data...