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为了比较不同类型的干扰源对数字电路的辐照效应,以串行数据分配电路为研究对象,以平面连续波和雷电电磁脉冲为干扰源,研究了不同类型的干扰源对数字电路的影响,通过改变辐照场强、频率等试验条件,总结了不同干扰源对数字电路的干扰规律,分析了干扰机理,并通过电路仿真进行了验证。试验结果表明:不管是连续波还是电磁脉冲,均能对数字电路造成干扰,但二者对数字电路的干扰结果不同,连续波辐照时,主要影响多谐振荡器方波的高、低电平持续时间及占空比,而电磁脉冲辐照时,则会产生一段频率远高于方波信号的振荡,而且在信号处于低电平时比高电平时更容易受到干扰。
In order to compare the radiation effects of different types of interference sources on digital circuits, the serial data distribution circuit is taken as the research object. The influence of different types of interference sources on the digital circuits is studied by using plane continuous wave and lightning electromagnetic pulses as interference sources. By changing the experimental conditions such as field intensity and frequency, the interference rules of different digital interference sources are summarized. The interference mechanism is analyzed and verified by the circuit simulation. The experimental results show that both the continuous wave and the electromagnetic pulse can interfere with the digital circuit. However, the interference between the two circuits is different. When the continuous wave is irradiated, it mainly affects the high and low power of the multivibrator square wave Flat duration, and duty cycle, and when the electromagnetic pulse is irradiated, an oscillation of much higher frequency than the square wave signal is generated, and the signal is more likely to be disturbed than the high level when the signal is at a low level.