In the high-speed design, the focus tends to be on signal integrity aspects of the traces; however, the power planes are also subject to integrity issues at high frequencies. The fact is that a board's Power Distribution Network (PDN) is more than just large areas of copper for the power and ground. Even the bypass capacitors chosen may not only fail to mitigate noise at specific frequencies, but the improper selection of the capacitor values can also contribute to the noise levels. As a result, a board will not only have issues of its own but will be at the mercy of the external environment in which it must operate.
The ICD PDN planner was developed to allow the layout designer to select bulk and bypass capacitor values that optimally provide low impedance paths for noise at all frequencies of concern on the PDN. Since the PDN planner can access the ICD stack-up planner's data, the board's effects can be added to the field solver to provide accurate results.
The ICD PDN Planner provides over 5,600 capacitors in the library. More will be added as they become available. The user can add capacitors to the library as well.