Intel Xeon Processor Multiprocessor Platform Design Guide

87
Processor Power Distribution Guidelines
NOTES:
1. Diagram not to scale.
2. No specification for frequencies beyond fcore.
3. Fpeak, if existent, should be less than 0.05 MHz.
Other requirements:
• Use shielded type inductor to minimize magnetic pickup.
• Filter should support at least 30 mA DC current.
• DC voltage drop from V
CC_CPU
to processor interposer pin V
CCA
should be < 33 mV, which
in practice implies series R < 1.1 Ω; also means pass band (from DC to 1 Hz) attenuation <
0.5 dB for V
CC_CPU
= 1.1 V, and < 0.35 dB for V
CC_CPU
= 1.7 V.
The following tables list some recommended components for the filter.
Figure 8-16. Filter Specifications
0dB
-28dB
-34dB
0.2dB
forbidden
zone
-0.5dB
forbidden
zone
1MHz 66MHz
f
core
f
pea
k
1HzDC
passband
high frequency
band
Table 8-6. Component Recommendation - Inductor
Part Number (Ref Designator) Value Tol SRF Rated I DCR
TDK MLF2012A4R7KT (L1) 4.7 µH 10% 35 MHz 30 mA 0.56 Ω (1 Ω max)
Murata LQG21N4R7K10 (L2) 4.7 µH 10% 47 MHz 30 mA 0.7
Ω (± 50%)
Murata LQG21C4R7N00 (L3) 4.7 µH 30% 35 MHz 30 mA 0.3 Ω max