參數(shù)資料
型號(hào)： KB9223-L
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)： 17/34頁(yè)
文件大?。?/td> 614K
代理商： KB9223-L
PRELIMINARY
RF AMP & SERVO SIGNAL PROCESSOR
17
KB9223 / KB9223-L
M/M-97-P006
1997. 10. 17
FUNCTION DESCRIPTION
1.RF Amp Block
1.1 RF Amplifier
The optical currents inputted through pins PD1(A+C) and PD2(B+D) are converted into voltages through
I-V amp, and they are added to RF summing amp. The voltage, converted from the photo diode
(A+B+C+D) signal, is outputted through RFO(pin74) and the eye pattern can be checked at this pin.
Figure 4. RF amp circuit
1.2 Focus Error Amp
The output of the focus error amp is the difference between I-V amp(1) output VA and
RF I-V amp(2) output VB. The focus error bias voltage applied to the (+) of focus error amp can be
changed by output voltage of D/A converter as shown in diagram, so that the offset of focus error amp
can be adjusted automatically by controlling 5 bits counter switches. Focus error bias can be adjusted
from the range of +100mV ~ -100mV by connecting the resistor on pin 63 (FEBIAS).
Figure 5. Focus error amp circuit
note1> VA and VB refer to output signal of PD1 and PD2 I/V amp.
note2> sev-stopb,sev-stop,fe-stopb and fcmpo are internal signals
65
66
-
+
-
+
74
-
+
73
PD1
PD2
RFO
RF-
58K
10K
VA
I-V amp(1)
VC
58K
10K
VB
I-V amp(2)
VC
VC
RF summing amp
63
-
+
59
-
+
-
+
sev-stopb
FEBIAS
sev-stop
<5 Bit Counter>
32K
32K
3K
X1
X2
X4
X8
X16
164K
FE1
160K
4K
fcmpo
vc
FEBIAS
fe-stopb
SW1
VB >
VA >
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