Embedded Voltage Regulator-Down (EmVRD) 11.0 Design Guidelines for Embedded Implementations Supporting PGA478

Embedded Voltage Regulator-Down (EmVRD) 11.0
January 2007 Design Guidelines for Embedded Implementations
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10.0—EmVRD 11.0
10.4 Resonance Suppression
V
CC
power delivery designs can be susceptible to resonance phenomena capable of
creating droop amplitudes in violation of load line specifications. This is due to the
interleaved levels of inductively-separated decoupling capacitance. Furthermore, these
resonances may not be detected through standard VTT validation and require
engineering analysis to identify and resolve. If not identified and corrected in the
design process, these resonant phenomena may yield droop amplitudes in violation of
load line specifications by superimposing with standard EmVRD droop behavior.
Frequency-dependent power delivery network impedance simulations and validation
Figure 17. Layer 1 CPU Socket V
CC
/GND Routing For Intel’s Reference Ten Layer
Motherboard
Note: The copper pour and black pins denotes V
CC
, the gray denotes V
SS