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參數(shù)資料
| 型號： | TZA1031HL |
| 廠商： | NXP SEMICONDUCTORS |
| 元件分類： | 消費家電 |
| 英文描述： | SPECIALTY CONSUMER CIRCUIT, PQFP64 |
| 封裝： | 10 X 10 MM, 1.40 MM, PLASTIC, MS-026, SOT-314-2, LQFP-64 |
| 文件頁數(shù)： | 18/52頁 |
| 文件大小： | 207K |
| 代理商： | TZA1031HL |
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2002 Jun 06
25
Philips Semiconductors
Product specication
Signal processing IC for DVD rewriteable
TZA1031
7.5
ALFA
7.5.1
ALFA MEASUREMENT CIRCUIT FOR RUNNING OPC
The task of the ALFA block is to measure the parameter ALFA for use as an error signal in the running-OPC control loop
of a dye or phase change writer. The two media types require different alfa measurement methods. For dye media the
decrease in pulse area of the returning signal during a write pulse is taken (‘a(chǎn)bsorption measurement’), for phase change
media the laser power incident on the recording layer is used, which is also derived from the returning signal (‘reflection
measurement’). For both media types two methods for alfa measurement are implemented, which are defined in
Sections 7.5.2 and 7.5.3. Selection of the 4 possible ALFA methods is done by bits PC/DYE (phase change or dye
media) and ALF1/2 (first or second method), see Fig.16.
handbook, full pagewidth
Iref2
Iref1
ALF1/2
NDYE
AN
CA
AINTON
ASTROBE
S&H
1/7
alfa-mon
alfa-dye
alfa-pc
ALFA
Gd
rf-alfa
MGW492
PEAK
DETECTOR
∫
CAN
LASP
IA2
IAN
IAT
IAN
+
DOC
CAN
r/w
0
LASP
SQRT
r/w
0
4.0
9.0
SLASP
INA
PC/DYE
+
ENALF
Fig.16 ALFA circuit.
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