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Circuit Descriptions
6-2 RF
6-2-1 RIC1 (KS1461)
KS1461 is combined with KS1452 and KS1453 as bipolar IC developed for DVD SERVO system.
Main features include DVD waveform equalizing, CD waveform equalizing, focus error signal generation, 3-beam
tracking error signal generation, DPD 1-beam tracking error, defect, envelope, MIRR output, etc. after receiving the
pick-up output converted into I/V.
6-2-1 (a) Basic Potentiometer
KS1461 uses a single power method and each circuit is based on V of 2.5V.
V (Pin 12, 20, 24, 67) terminal is needed for IC, which uses the peripheral V.
6-2-1(b) RF signal
Fig. 6-11 shows the flow of signal generated by the pick-up.
A, B, C, D signals detected from pick-up are converted in to RF signal(A+B+C+D) via RF summing AMP.
A
B
PICK-UP
C
D
PD
LD
F
E
Fig. 6-12 shows the waveform-equalizing block diagram for the RF signal.
It outputs to EQout (Pin 86) terminal by initially changing switching AMP gain of DVD and CD, and then adjust-
ing the level in RF SUM & AGC. It controls RF SUM & AGC gain by means of Pin 89-95 and interfaces with PWM
signal, (output from PWM terminal of KS1453, via low-pass filter to adjust boost gain and peak frequency.
EQout terminal is connected with EQin (Pin 86).
6-6
All manuals and user guides at all-guides.com
104
%
104
^
RE SUM
104
&
& AGC
104
*
3
TE
4
5
6
ABCD
7
SUM
8
FE
w
ALPC
E
Fig. 6-11
104
474
RFAGCO
EQIN
MIRRI
?
.
m
MIRR
RF EG
TESEL
DPD
Mhx
TE
ENV
FOK
DEFECT
G
MIRR
,
RFEQO
y
TE
ABCDI
i
103
I
ABCD
P
ENV
[
FOKB
F
DFCT2
d
DFCT1
T
FE
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