參數(shù)資料
型號: S1L9226X
廠商: SAMSUNG SEMICONDUCTOR CO. LTD.
英文描述: RF AMP & SERVO SIGNAL PROCESSOR
中文描述: 射頻放大器
文件頁數(shù): 38/56頁
文件大?。?/td> 454K
代理商: S1L9226X
S1L9226X
RF AMP & SERVO SIGNAL PROCESSOR
4
PRELIMINARY
TRACKING GAIN CONTROL CONCEPT
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 TEIO (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.
Gain control completes control when TGL output is H.
Vac < GLI <GHI
GLI < Vac < GHI
GLI < GHI < Vac
TGH (ISTAT output)
H
H
L
TGL (TRCNT output)
L
H
H
I/V AMP
I/V AMP
5bit (G4-G0)
From Micom
-
TE1
LPFT
LPF
AND
Logic
TGO
TGH
TGL
E Beam
F Beam
F
E
+
-
+
-
Arrary
Controlled by
5bit Switch
-
GLI
GHI
Vac
INTAT
To Micom
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