电源系统的噪声抑制.pdf

Power Supply Noise Suppression 电源系统的噪音抑制解决方案 Circuit Protection and EMI/EMC Solution Technical Seminars 第十届电路保护与电磁兼容技术研讨会 November 9th, 2011. Shanghai, China Marco Chen Senior Product Engineer Murata (China) Investment Co., Ltd. 村田（中国）投资有限公司 Note : 注 : The information of this material are as of the date mentioned above. They are subject to change without advance notice. If there are any questions, please 1 contact our sales representatives or product engineers. 对于这些材料信息以上面的日期为准。信息若有变更，恕不另行通知。若有任何疑问，请与我公司销售代表或产品工程师联系。 Problem on DC power supply for Large/High speed IC 大规模/高速IC的电源线问题点 1) Fluctuation of voltage (Ripple) is big 电源电压变动大 2) Ripple noise frequency is high. 波纹电压噪声的频率高 2 Necessity of the target impedance setting 目标阻抗设定的必要性 Target of impedance of DC power line for IC : Target Impedance (Z ) T IC工作所需要的电源阻抗的目标值 : 目标阻抗(Z ) T Z V ΔV : 为了保证IC工作的最大容许波动电压 T I ΔI : 从稳定状态到变动的最大可变电流 For keep stable DC power supplying, low impedance is required in DC power line in wide frequency range. 稳定的电源供给需要宽频带及阻抗低的电源线。