Description of circuit, Alpc (automatic laser power control) circuit, 1. block diagram – LG GSA-4167B User Manual

Page 43: Optical pick-up

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47

WGATE

RFPDSH

Optical

Pick-up

LD

Driver

Write

Strategy

FsDAC

WDAC

IAPC

R160

LPF

&

Gain

WFPDSH

FMON

RWAPC

buffe

r

2.5VRE

F

Buffer

S/H

B/H

+

-

13

S/H

MU

X

AM

P

APCDAC

(REDA/WRDA)

SCLK, SDATA, WDEN

12

9

9

8

10

28

29

126

127

CN101

IC101 (R2S35002))

IC301 (R8J32007)

BCNT

5

6

TCPH

32

134

175

R106

R105

C106

25,26,28

120,121,123

108

C105

DESCRIPTION OF CIRCUIT

1. ALPC (Automatic Laser Power Control) Circuit

1-1. Block Diagram

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