Design And Research Of FPGA Based Signal Acquisition Circuit For TFT Flat Panel Detector

The incidence of cancer is constantly increasing,especially with the trend toward more and more youth.For young people,cancer accounts for a significant proportion of deaths.In recent years,the average growth rate of digital medical equipment in our country is up to 20%.However,due to the lack of innovation capacity,the government's inadequate supporting measures and the incomplete application environment,China's application in high-end digital medical treatment still has a strong dependence on foreign countries.Digital medical equipment can't meet the needs of the market in both technology and production.The large demand of digital medical imaging and the strong dependence on foreign countries,aiming this reality in our country,a signal acquisition and processing circuit designed in this paper.The amplification,filtering and analog-to-digital conversion of analog front-end acquisition signal are achieved.Finally,the medical image with good definition and high signal-to-noise ratio is obtained.The system can be used for clinical examination of the chest X-Ray,to achieve the examination of heart,liver and lung.The system also can be applied to the breast machine for the breast screening and diagnosis;and it can be used in airport security.In this paper,the signal acquisition and processing circuit is designed;ADAS1256 is used as signal processer and converter to realize the digital signal with low noise and high precision.The source codes of control modules and the communication module are achieved by Verilog HDL.Besides,ISE software and Modelsim software are used for compiling,synthesis and simulation.Chipscope is used to monitor the internal signal in FPGA.Then,the schematic diagram is designed and PCB boards are produced.Finally,the hardware component of the whole system is completed successfully.The system is highly integrated,low power,and has a variety of power consumption modes.The system has high noise performance and image quality under different power modes.After software simulation and hardware verification,the system can work stably.The signal transmission and the analog to digital conversion are achieved by the source codes correctly.In summary,the signal acquisition system meets the requirements of the design criterion.