在讨论天文观测相机低噪声视频处理电路的基础上，对前置放大、差分放大、可编程增益放大、相关双采样及16bit模数转换等关键组成部分进行了分析，给出各组成部分的设计方法。对所设计的低噪声视频处理电路进行了PSPICE仿真和实验测试，仿真和实验结果表明，该视频处理电路在本身引入噪声较小的同时，有效地抑制了CCD的复位噪声和1／f等低频噪声，使天文观测相机的整机噪声＜15e^－，达到了指标要求。

The astronomical camera is composed of emitter follower,pre-amplifier,differential amplifier,programmable gain amplifier,correlated double sampling circuit and 16bit analog digital converter. All parts of the video processing circuit were analyzed and the design methods were presented. The low noise CCD video processing circuit was simulated by PSPICE and was tested. Results show that the designed circuit can effectively suppress reset noise and low frequency noise. The noise of astronomical camera is lower than 15 electrons,which can meet the requirement.