Research On High-performance Electron Multiplying CCD Imaging Components

With the increasing development of the electron multiplying CCD(EMCCD)towards high resolution and high frame rate,the requirements of the sensor for the driving ability and noise suppression ability of the peripheral circuit are also increasing.This paper takes EMCCD image sensor CCD201 as the main research object,and deeply studies EMCCD noise suppression,high-performance drive circuit design,low-noise analog front-end design,digital image processing and transmission and other issues.The application of frame rate EMCCD provides a valuable reference.The main research contents are as follows:Aiming at the high capacitive load characteristics of EMCCD,based on the analysis of EMCCD power drive characteristics and CCD201 drive requirements,a power drive circuit design method combining integrated chips and discrete devices is proposed,and a high transient current and wide voltage swing are developed.Wide EMCCD power drive module.After testing,the drive circuit designed in this article has better drive capability and low noise performance,better suppresses clock-induced charge noise and multiplication noise,and ensures that CCD201 works stably at a readout frequency of 10 MHz.In order to suppress the noise of the EMCCD output analog signal and improve the dynamic range of the component,based on the analysis of the output characteristics and acquisition requirements of the CCD201,the preprocessing and analog front-end acquisition circuit are designed,and the correlation double sampling is used to effectively suppress the reset noise and realize the digitization of the output signal acquisition.The test result shows that the imaging component has an average dark-field noise standard deviation of 27.978 DN with a 16-bit sampling accuracy,an effective number of 11 bits,and a dynamic range of 67.39 d B.It has the characteristics of low noise and wide dynamic range.In response to the component’s demand for digital domain signal generation and image processing,a digital signal processing system with FPGA as the core is designed to realize the functions of CCD201 timing generation,analog front-end control,digital image transmission and serial communication.After debugging and experimental verification,the digital signal processing system can complete the control of each module of the imaging component,and at the same time realize the function of configuring the relevant parameters of the component by the computer.