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随着电视技术在各个领域的广泛应用,对电视象质要求越来越高,特别是在微弱信号检测系统中,要求具有高的灵敏度和信噪比。本文简要介绍了摄象系统的噪声在图象上出现的现象,如何用普通示波器以切向噪声测量法对噪声有效值进行测量的方法;分析了噪声产生的原因,并进一步提出降低系统的白噪声方法——主要是正确选用低噪声晶体管,利用N_F—I_C、N_F—R_(SO)的关系曲线,设计最佳工作的放大器。同时,用屏蔽的方法降低外部干扰。
With the wide application of television technology in various fields, the requirements for television picture quality are getting higher and higher. Especially in weak signal detection systems, high sensitivity and signal-to-noise ratio are required. This article briefly introduces the phenomena of image noise appearing in the camera system, how to use the normal oscilloscope to measure the rms value of the noise by using the tangential noise measurement method, analyzes the reason of noise generation, and further proposes to reduce the whiteness of the system Noise Method - Mainly correct selection of low-noise transistors, the use of N_F-I_C, N_F-R_ (SO) curve, the design of the best working amplifier. At the same time, shielded to reduce external interference.