为适应数字电子系统的发展需要,研究数字电路中△I噪声的特性和抑制△I噪声的技术变得越来越重要。在△I噪声的产生过程及其基本特点的基础上,研究了△I噪声的主要危害。结果表明,△I噪声主要引起数字系统的电源电压波动、电路内部噪声、输出波形畸变和传播延迟、功耗增加、辐射发射等问题。 In order to meet the needs of the development of digital electronic systems, it is more and more important to study the characteristics of ΔI noise and the ΔI noise suppression in digital circuits. Based on the generation of △ I noise and its basic characteristics, the main hazards of △ I noise are studied. The results show that △ I noise mainly causes the power system voltage fluctuation, internal circuit noise, output waveform distortion and propagation delay, power consumption increase and radiation emission of digital system.