Intel
®
Pentium
®
III Processor with 512KB L2 Cache Dual Processor Platform Design Guide 5-9
The filter specification is graphically shown in Figure 5-8.
Other requirements:
• Use shielded type inductor to minimize magnetic pickup
• Filter should support DC current > 30mA
• DC voltage drop from VCC to PLL1 should be < 60mV, which in practice implies series R < 2Ω;also
means pass band (from DC to 1Hz) attenuation < 0.5dB for VCC = 1.1V, and < 0.35dB for VCC =
1.5V.
Figure 5-8. PLL Power Low Pass Filter Response
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