CCD输出信号的低噪声处理电路研究

本文针对电荷耦合器件（CCD）输出信号需要的低噪声处理要求研究了一种高增益、低噪声的信号处理电路,指出了电路的设计难点及注意事项。     

混合式镶嵌红外/CCD焦平面

混合式镶嵌红外/CCD焦平面结构的探测器元件具有高的封装密度,这可用成本相宜的平面加工技术来实现。该焦平面结构更可取的是:在含有集成CCD信号处理电路的硅衬底上,有一层绝缘层,而镶嵌光伏(Hg,Cd)Te探测器阵列就制造在此绝缘层上。自探测器阵列来的光电信号,通过薄膜电互连以及穿过绝缘层并在该层表面露出的接触衬垫,与CCD电路耦合。     

基于TDA8783的CCD视频信号处理技术

根据CCD输出视频信号的特点,分析并设计了CCD相机视频信号处理方案;使用集成了相关双采样电路(CDS)、增益控制电路(AGC)、箝位电路、模数转换器(ADC)等功能的CCD信号处理芯片TDA8783对视频信号处理电路进行了详细设计,对该处理过程进行了详细的研究和分析.最后,简单总结了视频处理电路中应注意的问题.     

快速光谱扫描系统的信息处理

一种采用CCD的快速光谱扫描系统已研制成功。本文介绍该系统信号处理环节软硬件的设计方法，其中包括CCD驱动电路，信号处理电路、A／D转换、计算机接口以及系统软件等。     

480×6红外探测器信号处理电路设计

针对480×6红外探测器的结构特点及输出信号的特点,设计了由阻抗变换电路、单端转差分电路、差分放大电路、模数转换电路、FPGA数据处理电路构成的信号处理电路,其中FPGA数据处理电路中,重点针对480X6红外探测器的拓扑结构介绍了奇偶校正电路的设计思路.在详细介绍信号处理电路各组成部分的设计方法和设计思路后,对设计的电路进行了仿真及测试.测试结果表明,设计方案正确可行,满足设计需求.     

基于CPLD的CCD视频信号处理电路的设计与硬件实现 基于CPLD的CCD视频信号处理电路的设计与硬件实现

在分析VSP1012型CCD视频信号处理芯片工作原理的基础上,设计了CCD成像系统的视频信号处理电路及其硬件电路.选用CPLD器件作为硬件设计载体,使用VHDL语言对VSP1012的初始化设置和驱动时序发生器进行了硬件描述.并针对ALTERA公司的EPM7160SLC84-10进行了RTL级仿真及配置.硬件实验结果表明,所研制的CCD视频信号处理电路不仅可以满足CCD成像系统视频信号处理的要求,而且集成度高,应用方便.     

红外焦平面读出电路技术及发展趋势

从红外焦平面技术的发展背景出发,论述了读出电路在红外焦平面信号传输中的作用并介绍其基本框图,讨论了CCD读出电路和CMOS读出电路各自的特点,并分析了国内外红外焦平面读出电路的现状,最后提出了红外焦平面阵列读出电路今后的研究方向.     

制冷型红外探测器关键驱动与信号处理电路设计

驱动与信号处理电路是红外成像系统的重要组成部分,高质量的电路有利于系统获得高信噪比。针对制冷型红外探测器电学接口特点,成像电路架构采用焦面电路和信号处理电路,基于电路架构,设计出高集成度、低噪声的驱动与信号处理电路,给出部分仿真结果和电路噪声估算方法。介绍了一种软硬结合的降噪方法,最后给出了电路核心指标噪声的测试方法和具体噪声值。     

4×288 TDI CCD信号读出电路

采用硅工艺设计、制作了4×288 TDI CCD红外焦平面HgCdTe阵列专用信号读出电路。文章详细介绍了4×288 TDI CCD信号读出电路的设计及制作,并给出了测试结果。     

CCD观测相机视频处理电路的设计

在讨论传统的CCD观测相机视频处理方式的基础上,设计了以高集成度的专用CCD视频信号处理芯片VSP2212为核心的CCD观测相机视频处理电路方案.对所设计的视频处理电路进行了软硬件联调测试,仿真和实验结果表明,该系统集成度高,功耗小,运行稳定,噪声低,使CCD观测相机朝着轻最化、小型化方向发展奠定了良好的基础.     

Application of charge-coupled devices to infrared detection and imaging

A review of infrared sensitive charge-coupled devices (IRCCD) is presented. Operational requirements of typical IRCCD applications are briefly introduced. IRCCD devices are divided into two major categories: a) Monolithic devices, which essentially extend the original CCD concept into the IR. Monolithic IRCCD's discussed include inversion-mode devices (with narrow bandgap semiconductor substrate), accumulation-mode devices (extrinsic wide bandgap semiconductor substrate), and Schottky-barrier devices (internal photoemission), b) Hybrid devices, in which the functions of detection and signal processing are performed in separate but integratable components by an array of IR detectors and a silicon CCD shift register unit. Hybrid IRCCD's discussed include both direct injection devices (in conjunction with photovoltaic IR detectors) and indirect injection devices (in conjunction with pyroelectric and photoconductive devices).     

Design of vision measurement system of double optical paths with single CCD based on DSP

The design of vision measurement system of double optical paths with single CCD based on the digital signal processor （DSP） is presented. Using TMS320F2812 as the intelligent control unit, the CCD driving circuit, level conversion circuit and CCD output signal data acquisition and processing circuit are designed. By means of plane reflectors, the optical structure of the system is optimized, which reduces errors owing to tilt effect of the measured unit, improves measuring accuracy and makes the system more compact. Double optical paths signal data acquisition with single CCD is demonstrated. In addition, the improved resolution is enhanced up to sub-pixel level by the average polynomial interpolation algorithm.     

Hybrid IRCCD imaging array

A hybrid IRCCD for high background application has been successfully fabricated. The device consists of fifty Hg0.7Cd0.3Te detector diodes of 50-µm × 50-µm sensitive areas and a silicon CCD maltiplexer with input circuits on 40-µm centers having bucket background subtraction and blooming protection circuits. The noise-equivalent power (NEP) of the IRCCD is 5 × 10^-14W-Hz^-1/2at background photon flux level of 4 × 10¹⁵photons . cm^-2s^-1, integration time of 2 × 10^-5s, and clock frequency of 3 × 10⁶Hz. The noise source of the detector diodes limits the IRCCD performance. The IRCCD is also evaluated with the real-time raster-scanned thermal images displayed on a CRT monitor. Two-dimensional images are generated by using a scanning mirror. A fixed-pattern noise is reduced by comparison of an object video to the reference video stored in a memory. A noise-equivalent temperature difference of the system is 0.6°C at a frame rate of 30 Hz. Instantaneous field of view is 1 mrad × 1 mrad and the field of view of the system is 12° × 5.7°.     

128×128元IRCCD成像技术

研制成功了１２８×１２８元ＰｔｓｉＩＲＣＣＤ，获得了清晰的室温目标热像。文章叙述了该摄像机驱动逻辑电路的设计、驱动方式的研究和视频信号、数字信号的处理。     

Design and Fabrication of Silcon Microlens with Low SAG for 528(H) × 528(V) Infrared Charge-Coupled Device Application

Microlens array is an important optical element to improve the photosensitivity of charge-coupled device (CCD). In this paper, a monolithic integration technology between microlens and 528 × 528 element PtSi Schottky-barrier infrared charge-coupled device (IRCCD) with a pixel size of 30μm × 30μm has been developed. The microlens array with low sag and long focal length is designed based on geometrical optics theory. It is directly formed on the back side of the substrate in IRCCD chip using successive photolithography and A⁺ ion beam etching (IBE) technology. The microlens array is characterized by both surface stylus and point spread function (PSF). The experiment results of integration device between IRCCD and microlens array indicate that the optical signal response is improved obviously and a responsivity increase by a factor of 1.8 in the operation band.     

基于背照式CCD的微弱目标成像系统设计

为了对微弱目标进行探测,提出一种采用背照式CCD47-10为传感器的成像系统设计方案。通过对CCD47-10的工作原理和性能参数进行分析,完成电源模块、驱动模块、信号处理模块、数据传输模块的硬件设计。使用VHDL语言完成FPGA中的逻辑电路设计,使用VC++完成上位机软件设计。最后通过搭建实验系统,在微弱光下对光栅进行成像,并分析图像信噪比。实验结果表明,设计的系统在对微弱目标成像时信噪比为72,能够满足对微弱目标探测的应用要求。     

线阵CCD图像传感器驱动电路的设计

随着CCD性能的不断提高,CCD技术在军、民用领域都得到了广泛的应用.介绍了TCD1501C线阵CCD的驱动电路设计,详细介绍了用VHDL完成的CCD图像传感器驱动时序设计和视频输出差分信号驱动电路的设计.