Download Steve Sandler’s full paper for DesignCon 2023
A New Power Integrity Requirement
to Supplement Target Impedance:
Quantifying PDN Impedance Flatness
Abstract: Target impedance is the most common power distribution network (PDN) design requirement used in industry today, but it is fundamentally limited because it does not account for PDN voltage responses to different load current waveform shapes, and can only predict worst-case voltage excursions in the specific case of a flat PDN impedance profile. Since no impedance path is perfectly flat, and PDNs inevitably contain one or more resonances that can generate worst-case voltage excursions, it is critical to quantify whether PDN impedance profiles are “flat enough.” This paper presents a methodology to quantify PDN impedance flatness using quality factor (Q), group delay, and Sandler Non-Invasive Stability Measurement (NISM). It also proposes a PDN impedance flatness requirement to supplement target impedance requirements.
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