3
Block Diagram
PHOTO
DIODES
COMPARATORS
INDEX-
PROCESSING
CIRCUITRY
SIGNAL PROCESSING
CIRCUITRY
DETECTOR SECTION
CODE
WHEEL
EMITTER
SECTION
LENS
LED
V
CC
CH. A
CH. B
CH. I
GND
RESISTOR
+
−
A
A
+
−
B
B
+
−
I
I
4
3
5
2
1
Output Waveforms
P
C
CH. A
CH. B
ROTATION
AMPLITUDE
φ
S1
S2 S3
S4
CH. I
2.4 V
0.4 V
2.4 V
0.4 V
2.4 V
0.4 V
P
0
t
1
t
2
