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去耦电容的安装谐振频率如何选择？
在电源完整性设计中，去耦电容的自谐振频率应该如何选择？是否越接近目标噪声频率越好？
去耦电容谐振PDN
PI学习者2026-08-173453Answer
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Accepted Answer
High-frequency discrepancies are typically caused by the following: 1 Material parameters (Dk/Df) not accurately modeled for frequency dependence; 2 Conductor surface roughness model not enabled; 3 Inconsistent port calibration reference planes. First, verify material settings and enable the Huray roughness model, then compare simulated and measured group delay.
Senior Engineer2026-08-19
Additionally, verify that the mesh is sufficiently fine. At high frequencies, the skin depth decreases, so ensure there are at least 3 to 4 mesh layers across the conductor cross-section. Also, placing radiation boundaries too close to conductors can introduce errors.
Simulation Expert2026-08-19
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