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1
1.1.2 RF and RFAGC amplifiers
A
The photo-detector outputs (A + C) and (B + D) are added, amplified, and equalized inside this LSI, and then provided
as the RF signal from the RFI terminal. The RF signal can be used for eye-pattern check.
The low frequency component of the RFO voltage is:
RFO = (A + B + C + D) x 2
The RFO is used for the FOK generation circuit and RF offset adjustment circuit.
The RFI output from the pin 118 is A/C-coupled outside this LSI, and returned to the pin 117 of this LSI. The signal is
amplified in the RFAGC amplifier to obtain the RFAGC signal. This LSI is equipped with the RFAGC auto-adjustment
function as explained below. This function automatically controls the RFO level to keep at 1.5V by switching the feed-
back gain for the RFAGC amplifier.
B
The RFO signal is also used for the EFM, DFCT, MIRR, and RFAGC auto-adjustment circuits.
C
PICKUP UNIT(SERVICE)(P10)
P3
P7
P9
VREF
P2
D
P4
P8
Fig. 1.1.2 RF/AGC/FE
E
F
4
1
2
CD CORE UNIT(S10MP3)
UPD63760GJ
VREF
124
A+C
A
13
13
125
10 k
C
10 k
127
B+C
D
6
6
126
10 k
B
10 k
2
3
0.1 µ
0 k
+
-
15.2 k
15.2 k
35 k
RFOFF setup
R2
+
-
+
61.0 k
-
8.8 k
111 k
+
-
61.0 k
8.8 k
CX-3057
3
4
RF-
RF2-
10 k
10 k
7.05 k
+
-
-
+
AGCO
20 k
11.2 k
To DEFECT / A3T detection
For RFOK generation
+
-
160 k
64 k
FE A/D
RFOFF setup
VREF
4
122
10 k
121
119
1.8 k
EQ2
3 p
9 p
120
1.8 k
EQ1
27 p
10 k
116
134
FEO
133
FE-
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