提高电路可靠性的几项技术

为了提高电路的可靠性 ,结合几个具体电路 ,从 4个方面简要阐述了抑制电路中的噪声和干扰的原理及实施办法。其中 ,使电位器的滑动接点远离放大器的输入端及尽可能将电位器用在大信号一侧的方法 ,能在一定程度上减小噪声电压对整个电路的影响 ;在继电器线圈两端并接高速放电二极管和 RC吸收电路能大大消弱继电器工作时线圈两端产生的负脉冲电压 ;用金属壳将高输入阻抗放大器的输入端屏蔽可消除各种外界干扰信号对放大器的干扰 ,而在高输入阻抗放大器的输入端接入隔离环可减少电源线漏电等对放大器的影响 ;在数字电路的终端连接终端电阻会明显改善数字电路中易出现的终端反射效应

Several Methods of Increasing Circuits Reliability

With several actual circuits,the paper exemplifies the principle and methods to inhibit the noise and interference in circuits in four aspects.Firstly,the method that makes potentiometer far from the input terminal of amplifier and puts the potentiometer on the side of big signal can decrease the effect of noise voltage on whole circuit to a certain extent.Secondly,the method that connects a high speed discharge diode on the relay coil and connects RC absorption circuit can extremely decrease the negative pulse voltage from relay coil.Thirdly,the use of a metal shell to isolate the input terminal of high input resistance amplifier can clear up any effect of external interference signal on amplifier.Fourthly,the method that connects an isolation ring on the terminal of high input resistance amplifier can decrease the effect of leakage of electricity from power supply wire on the amplifier.Finally,the method that connects terminal resistance on the terminal of digital circuit can obviously improve the terminal reflection effect in digital circuit.