參數(shù)資料
型號(hào)： S1L9225X
廠商： SAMSUNG SEMICONDUCTOR CO. LTD.
英文描述： RF AMP & SERVO SIGNAL PROCESSOR
中文描述： 射頻放大器
文件頁(yè)數(shù)： 43/60頁(yè)
文件大?。?/td> 623K
代理商： S1L9225X
RF AMP & SERVO SIGNAL PROCESSOR
S1L9225X
43
TRACKING GAIN CONTROL CONCEPT
I/V AMP
I/V AMP
5bit (G4-G0)
From Micom
-
TE1
LPFT
LPF
AND
Logic
ISTAT 2
(Trcnt)
ISTAT 1
TGO
TGH
TGL
E Beam
F Beam
F
E
+
-
+
-
Arrary
Controlled by
5bit Switch
-
TE2
GLI
GHI
Vac
1K, 103
To Micom
Operation Summary
Tracking gain control is executed by comparing the previously set gain set value of the window with the only the
pure AC component of the signal TESO (DC+AC) , which was extracted the resistance divide of the tracking error
amp output, passed through the LPF and DC offset .
The resistance divide regulates the gain by changing the 5 bit resistance combination with micom command. The
tracking gain control is executed under the balance control, the same of focus loop on, spindle servo on, tracking
servo off and sled servo off and controls amount of optical pick-up reflection and tracking error amp gain.
External LPF cut-off freq. Is 1o 10Hz - 100Hz. The window comparator comparison level can be selected
between +150mV - +300mV and +250mV - 200mV using the micom command.
TGL outputs the +150mV and
+250mV comparator outputs to TRCNT.
TGH outputs the +300mV and
+200mV comparator outputs to ISTAT.
Vac < GLI <GHI
H
L
GLI < Vac < GHI
H
H
GLI < GHI < Vac
L
H
TGH (ISTAT output)
TGL (TRCNT output)
Gain control completes control when TGL output is H.
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