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为研究静电放电对电路板的干扰,利用传输线脉冲发生器提供激励脉冲,并配合测试探头,对电路板进行干扰测试,并以一单片机系统为测试对象进行干扰研究。首先,根据传输线脉冲生成原理,用同轴电缆、水银继电器及高压源设计和制作了1个传输线脉冲发生器,并将脉冲波的上升时间控制在1 ns以内;然后,分别用电场探头、磁场探头和注入探头建立了激励信号与被干扰对象之间的电场、磁场和传导耦合,通过试验观察了其耦合干扰信号,并研究了测试单片机系统的抗干扰特点。通过研究及测试得出:为保证传输线脉冲发生器的脉冲上升时间的要求,应选择快速继电器,控制好继电器与同轴电缆的连接以减少寄生参数的影响;用传输线脉冲发生器配合电场、磁场和注入探头进行测试,可以探查电路板的局部抗干扰薄弱环节;测试的单片机系统的抗干扰特点体现在:其局部区域对磁场干扰较敏感,晶振引脚和复位引脚对直接注入干扰更敏感。
In order to study the interference of electrostatic discharge on the circuit board, the pulse generator of transmission line is used to provide the excitation pulse, and the test probe is used to test the circuit board interference. A single chip computer system is used to study the interference. First of all, a transmission line pulse generator was designed and fabricated by using coaxial cable, mercury relay and high voltage source according to the pulse generation principle of transmission line. The rise time of pulse wave was controlled within 1 ns. Then, The magnetic field probe and the injection probe establish the coupling of the electric field, the magnetic field and the conduction between the excitation signal and the interfered object. The coupling interference signal is observed through the experiment, and the anti-interference characteristic of the testing monolithic integrated circuit system is studied. Through researching and testing, it is concluded that in order to ensure the pulse rise time of the pulse generator, a fast relay should be selected to control the connection between the relay and the coaxial cable so as to reduce the influence of parasitic parameters. The transmission line pulse generator is used in combination with electric field and magnetic field And probe into the probe, you can probe the circuit board local anti-jamming weaknesses; testing of the single-chip system anti-interference characteristics are reflected in: the local area of the magnetic field is more sensitive to interference, the crystal pin and the reset pin is more sensitive to direct injection interference .