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參數(shù)資料
| 型號： | P32P4911A |
| 廠商： | NXP SEMICONDUCTORS |
| 元件分類： | 光電元器件 |
| 英文描述： | PRML Read Channel with PR4, 8/9 ENDEC, FWR Servo |
| 中文描述： | 1 CHANNEL READ CHANNEL, PQFP100 |
| 封裝： | 14 X 14 X 1.40 MM, PLASTIC, LQFP-100 |
| 文件頁數(shù)： | 13/63頁 |
| 文件大?。?/td> | 257K |
| 代理商： | P32P4911A |
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1996 Jul 25
13
Philips Semiconductors
Product specification
PRML Read Channel with PR4,
8/9 ENDEC, FWR Servo
P32P4911A
With a zero at the origin, the filter provides a time-differentiated filter output. This is used in time qualification of the peak
detection. To ease the timing requirement in peak detection of a signal slightly above the qualification threshold, the
time-differentiated output is purposely delayed by 1.2 ns relative to the normal low pass output.
The normal low pass output feeds the data qualifier (DP/DN), and the differentiated output feeds the clock comparator
(CP/CN).
Five definitions are introduced for the programmable filter control discussion (Figure 6):
Cutoff Frequency: The cutoff frequency is the -3 dB low pass bandwidth with no boost and group delay equalization, i.e.
α
=0 and
β
=0.
Actual Boost: The amount of peaking in magnitude response at the cutoff frequency due to
α≠
0 and/or
β≠
0.
Alpha Boost: The amount of peaking in magnitude response at the cutoff frequency due to
α≠
0 and without group delay
equalization. In general, the actual boost with group delay equalization is higher than the alpha boost. However, with
>3 dB alpha boost, the difference is minimal.
α
=1.31703 x (10
BOOST(dB)/20
-1)
Group Delay
%: The group delay
% is the percentage change in absolute group delay at DC with respect to that
without equalization applied (
β
=0).
β
=0.04183 * GD%.
Group Delay Variation: The group delay variation is the change in group delay from DC to the cutoff frequency. This
can be expressed as a percentage defined as: (change in group delay
÷
absolute group delay with
β
=0) * 100%. An
alternative is to express the group delay variation in nanoseconds. Because the absolute group delay variation in
nanoseconds is scaled by the programmed cutoff frequency, the percentage expression is used in this specification.
SM00010
IN
s
2
– s+1.31703
s
2
+1.68495s+1.31703
2.95139
s
2
+1.54203s+2.95139
5.37034
s
2
+1.14558s+5.37034
0.86133
s+0.86133
s
s+0.86133
Normal
Differential
Figure 5: Programmable Filter Normalized Transfer Function
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