对视频放大器自动增益控制电路的控制方式及其优缺点进行分析,结合实际应用中出现的问题,对自动增益电路进行改进。通过电路仿真及试验,表明改进后的电路既能有效提高视频放大器的输入动态范围,稳定输出,又能抑制噪声对自动增益控制电路的影响。%Control method of automatic gain control （AGC） for video amplifier and its advantage and disadvantage are analysed in this paper. Combined with fault discovered in application, AGC circuit is improved. Through circuit simulation and testing, the results show that the improved circuit not only ef- fectively improves the input dynamic range of video amplifier, but also can suppress influence on AGC cir- cuit from the leaking signals.
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