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3-3. TRACKING ERROR (TE)
3-3-1. TE for DVD-ROM (DPD)
A
H.P.F
43
D
H.P.F.
44
C
46
H.P.F
B
H.P.F.
47
TE signal for DVD-ROM is made by DPD (Differential Phase Detect) method.
TE signal is made that add voltage obtain form phase differnece of front spot A, D to voltage obtain two phase
difference of rear spot B, C.
Final stage amp gain is determined by register "TEG" and TE signal amplitude is about 1.65Vpp. (Center
voltage of TE signal is about 1.65V)
Balance of TE signal center voltage is 1.65V.
Adjustment is operated by monitoring TE signal balance which feed into IC201 111pin.
22
EQ
DPD
EQ
EQ
DPD
EQ
Tracking error Circuit
DPP
TESEL
TEG
TE
14
1.65V
1.65V
1.65Vpp
Center Voltage = 1.65V
IC201
PWM
Balance
Detect
111
A/D
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