摘要
电源分配网络(PDN)的阻抗在指定频段内要求足够低。两个不同容值的并联去耦电容可以降低PDN的阻抗,但是其等效特性阻抗所产生的反谐振点也会引入到PDN阻抗中,该点可能会超过目标阻抗,所以需要合理地选取去耦电容器,尽可能降低该点阻抗。从并联电容的等效电路模型出发,推导并验证了电容参数与反谐振点频率、反谐振点阻抗的数学模型;随后通过实例将该模型应用于基于目标阻抗的设计方法中,证明了该模型实施的直观性和有效性。
The impedance of power distribution work need low enough over a specified band. Two bypass capacitors with different values may create resonance peak, unless the capacitor parameters are selected properly. The mathematical model of capacitor parameters with resonance peak＇s frequence and impedance is derivated and verified from the equivalent circuit model of parallel capacitors in this paper. This mathematical model is applied in the design method of target impedance-based by example, which proves the implementation of this model is intutive and effective.
出处
《电子技术应用》
北大核心
2013年第9期61-62,69,共3页
Application of Electronic Technique
关键词
PCB
PDN
去耦电容
特性阻抗
反谐振点
PCB
PDN
decoupling capacitor
characteristic impedance
resonance peak
