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Circuit Descriptions
5-2 RF
5-2-1 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.
5-2-1 (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.
5-2-1(b) RF signal
Fig. 5-11 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.
104
RFAGCO 474 EQIN MIRRI ? . m A PICK-UP B C D PD LD F E 3 4 TE 5 6 7 8 ABCD SUM ENV FOK DEFECT FE w E ALPC Fig. 5-11 Fig. 5-12 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 adjusting 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. i I P [ F d T ABCDI
103 104 104 104 104
% ^ & * DPD TE RE SUM & AGC
MIRR RF EG TESEL Mhx
G MIRR , RFEQO
y TE
ABCD ENV FOKB DFCT2 DFCT1 FE
5-6
Samsung Electronics
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