摘要：视频放大电路是CRT背投电视系统中很重要的电路，它的设计好坏对电视图像信号具有很大的影响。视频放大电路设计包括R、G、B视频信号的放大设计，投影管及其附属电路设计，消亮电路以及关机时信号的流向控制设计。
本设计研究并完成了CRT背投电视视频图像放大电路的设计。在进行具体设计之前，首先了解电视发展的状况以及CRT电视的市场需求现况，理解CRT背投电视系统的组成和电视信号传输的原理，其中重点对CRT背投电视视频图像放大电路的组成和工作原理，以及电路的元件组成、信号处理、增益、带宽和其它方面进行研究，并根据相关产品要求进行电路系统的设计。
通过将设计好的电路接到CRT背投电视中进行实际调试，电路功能满足CRT背投电视图像处理的要求，达到设计的目的。
关键字：CRT；背投；视频放大；增益
The Design of CRT Rear Projection
Video Amplifying Circuit
Abstract: The circuit of video amplifying is an important part of CRT rear projection TV system, and it has great influence on the displaying of TV image. The designing of video amplifying includes the amplified design of R, G, B video signal, the circuit of projection tube and its subsidiary, the circuit of bright spot relieved, and the signal flow controlled when TV turn off.
The circuit video amplified of the CRT rear projection TV has been researched and completed. Before carrying out specific design, firstly ,understanding the situation of the development of the television and CRT TV market demand situation, the composition of CRT rear projection television system and the principle of television signal transmission, which focus on researching the composition and the working principle of the circuit of CRT rear projection television video image amplifide, and the element composition, the signal processing, the gain, the bandwidth and other aspects of the circuit, and designing the circuit system according to the demand of related products.
By fixing the design circuit to a good CRT rear projection television and debugging actually, finding that the function of the circuit meet CRT rear projection television image processing requirements, and achieving the purpose of the design.
Keywords: CRT, Rear projection, Video Amplifier, Gain
