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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
, V
) signals are equal. The occurrence of tracking error is due to difference between F I – V
F
E
AMP output and E I – V AMP output.
260K X
V
I
X
( [
=
F
F
26K
R
V
I
X
[
A
=
E
E
R
22K
+
B
V
=
I (
accordingly,
TE
1
13K
)
273K
I
X
+
=
F
260K
R
260K
+
+
+
A
-
I
)
X
1290K
E
F
403K
]
]
28
FL8550
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