描述
TC-CCR014 97321174-A01
由于数字电路是利用上升沿/下降沿很短的脉冲信号，所以会向外部放出包括高频成分的多余电磁波（噪声），而且对外部来的电磁波（噪声）敏感地响应，造成误动作。另外在电路内部也存在线间产生交调失真、数字器件的通/断时电流急骤变化引起电源电压变动等问题。这样就需要在数字电路中考虑布线的电感和寄生电容构成的分布常数电路、防止上冲、下冲造成波形的混乱及信号反射、延迟、衰减、线间电磁干扰的交调失真。而解决这问题的滤波器、屏蔽等都是模拟技术。由于数字电路技术在汽车、火车、收音机控制中的应用，高可靠性地实现了以前用模拟技术无法实现的高功能。但是由于噪声会引起系统及电路误动作，尤其对机器为系统是致命的问题。而模拟电路即使有噪声，也只是暂时降低数据的精度，一旦噪声消失，就具有自我恢复功能的特征。因此将实现高功能的数字电路和具有自我恢复/自我确认能力的模拟电路组合应用，对防止移动控制系统、数字电路噪声引起的误动作将会是一种安全的方案。
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