2. TRACKING ERROR AMPLIFIER
The output of photo detector F is directed to the (-) Input of F I – V AMP and out of photo detector E is
directed to the (-) input of E I – V AMP.
These input signals are current.
E I – V AMP and F I – V AMP are converted into voltage from the current signal. When correct tracking,
two input (V
F
, V
E
) signals are equal. The occurrence of tracking error is due to difference between F I – V
AMP output and E I – V AMP output.
]
403K
X
I
273K
)
26K
13K
260K X
(
[
X
I
V
F
F
F
=
+
=
]
260K
R
260K
22K
R
R
[
X
I
V
A
B
A
E
E
+
+
+
+
=
accordingly,
1290K
X
)
I
-
I
(
V
F
E
1
TE
=
FL8550
28
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