KB9223-L 데이터 시트보기 (PDF) - Samsung

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KB9223-L

RF AMP & SERVO SIGNAL PROCESSOR

Samsung 

KB9223 / KB9223-L

PRELIMINARY

RF AMP & SERVO SIGNAL PROCESSOR

1.5 Mirror Circuit

IRF signal is amplified by the mirror amp, and the peak and bottom component of amplified signal are

detected by peak and bottom hold circuit. The peak hold circuit covers traverse signal of up to 100KHz

component and bottom hold circuit capable of covering the envelope frequency of disc rotation. The time

constant for the mirror hold must be sufficiently larger than that of the traverse signal.

IRF 75

38K

17K

-

+

19K

Peak and

Bottom

Hold

2.5K

-

+

-

+

17K

96K

+

-

1.5K

1 MCP

39 MIRROR

Figure 8. Mirror Circuit

1.6 EFM Comparator

The EFM comparator converts a RF signal into a binary signal.

Beacuse the asymmetry generated due to variations in disc manufacturing can not be eliminated by the

AC coupling alone, this circuit uses to control reference voltage of EFM comparator for eliminating

asymmetry.

40K

RFI 77

+

-

19K

+

-

100K

100K

20K

+

-

85K

1 EFM

39 ASY

Figure 9. EFM Comparator & asymmetry circuit

M/M-97-P006

19

1997. 10. 17

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