參數(shù)資料
型號(hào)： KB9224
廠商： SAMSUNG SEMICONDUCTOR CO. LTD.
英文描述： VIDEO-CD 2ND GENERATION
中文描述： 視頻-環(huán)糊精第二代
文件頁(yè)數(shù)： 39/55頁(yè)
文件大?。?/td> 450K
代理商： KB9224
VIDEO-CD 2ND GENERATION
KB9224
39
GAIN ADJUSTMENT
Process Summary
The Signal TE1 output by the Tracking Error Amp outputs resistance divide (DC+AC) passes through LPF and the
DC Offset extract signal (DC) difference AMP. Only pure AC components are compared with the pre-selected
Window Comparators Gain select value to carry out the Tracking Gain Adjustment.
The Resistance Divide changes the 5-bit resistance combination with the MICOM Command, to change the Gain.
Tracking Gain Adjustment is carried out in the same conditions as Balance Adjustment, which is: Focus Loop On,
Spindle Servo On, Tracking Servo Off and Sled Servo Off. It adjusts the Tracking Error Amps Gain and the wide-
rage Pick-ups amount of reflection.
The external LPFs Cut-off Frequency is set to 10 Hz ~ 100 Hz.
The Window Comparators comparison level can be chosen from +150 mv ~ +300 mv, and +250 mv ~ +200 mv by
MICOM command.
TGL outputs +150 MV and +250 MV comparator output to TRCNT.
TGH outputs +300 MV and +200 MV comparator output to ISTAT.
Gain Adjustment is complete when the output is H.
Vac < GLI < GHI
GLI < Vac < GHI
GLI < GHI < Vac
TGH
H
H
L
TGL
L
H
H
TE2
LPFT
TE1
-
+
-
+
I/V Amp
I/V Amp
69
AND
Logic
Vd
c
Controlled by
5 bit switch
(B4~ B0)
from MICOM
70
F
E
F
beam
E
beam
30
29
LPF
GH
I
GLI
TGL
TGH
TGO
ISTAT
TRCNT
To MICOM
1 K, 103
Resistance
Array
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