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| 型號： | pentium pro processor |
| 廠商： | Intel Corp. |
| 英文描述： | Pentium Pro Processor with 1MB L2 Cache at 200MHZ(1兆比特L2高速緩存頻率200兆赫茲處理器) |
| 中文描述： | 奔騰Pro處理器在200MHz（1兆比特二級高速緩存頻率200兆赫茲處理器帶有1MB的L2緩存） |
| 文件頁數(shù)： | 19/39頁 |
| 文件大?。?/td> | 930K |
| 代理商： | PENTIUM PRO PROCESSOR |
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E
4.3.1.
AP-523
19
BULK CAPACITANCE
To understand why just adding more capacitance is not
always effective, one must consider the Effective Series
Resistance (or ESR) of the capacitance being added. This
is the inherent resistance of the capacitor plate material.
One way to understand where
ESR
comes from, and how
to recognize a low ESR capacitor, is to analyze a
cylindrical capacitor. By unrolling the metal of the
capacitor it appears as a sheet. This sheet has some linear
resistance in
W
/inch. A longer sheet (Bigger diameter
capacitor) increases ESR. A wider sheet (Taller
capacitor) decreases the ESR.
Figure 16. ESR Cylindrical Capacitor
Another effect is the fairly high inductance of the bulk
capacitors. These elements can be modeled as shown in
Figure 17.
Again, this was taken from the complex model of
Figure 3. Overcoming ESR is discussed here while
assuming for now that the inductance effect will be
addressed by the high frequency decoupling capacitors
discussed in Section 4.3.2.
C
ESR
ESL
Figure 17. A Capacitor Model
Figure 18 shows the relationship between current
delivered (with a 60 mV budget) and the ESR of the
capacitors. As can be easily seen, even with infinite
capacitance, 6 m
W
of ESR at 10A drops the full budget
of 60 mV as shown in Equation 2.
Equation 2. ESR Allowed for 60 mV Budget
R
mV
I
=
60
/
0.000
0.005
0.010
0.015
0.020
0.025
0.030
2.000
4.000
6.000
8.000
10.000
Amps
ESR required in ohms
Figure 18. ESR Required for Various Current Demands
Length
Width
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