利用有效去耦上升时间选择去耦电容的方法

传统的基于频域目标阻抗的电源分配网络设计方法忽略了电源分配网络和电流激励的瞬态特性，不能准确地表征电源分配网络的高频特性．针对该问题，在输入电流激励形式为三角电流的条件下，推导出需要添加去耦网络的电流激励上升时间的临界条件以及去耦电容能有效去耦的电流激励上升时间范围．通过进一步研究去耦电容最大电压噪声与上升时间和电容参数的关系，提出利用有效去耦上升时间选择去耦电容的方法．最后利用该方法对4种典型的输入激励进行电源分配网络设计．仿真结果表明，与频域目标阻抗法相比，这种方法至少可减少31.6%的电容数量．

Capacitor selection method based on the effective decoupling rise time

The traditional power distribution network design method is based on the frequency-domain target impedance, but this method ignores the transient characteristics of the power distribution network and current excitation, and can not represent the high frequency characteristics of the power distribution network accurately. Aiming at this problem, under the condition that the input current is in the triangular form, the critical rise time of the input current which needs to add decoupling capacitors and the effective decoupling rise time range of the capacitor are deduced. The relationship between the maximum voltage noise of the decoupling capacitor and the rise time and the relevant capacitance parameters is further investigated, and then the capacitor selection method based on the effective decoupling rise time is proposed. Compared with the frequency-domain decoupling method, the results of the decoupling design for 4 typical stimuli show that the number of capacitors can be reduced more than 31.6%.