cxa1372bs Sony Electronics, cxa1372bs Datasheet - Page 17

• Manufacturer Part Number: cxa1372bs
• Description: Rf Signal Processing Servo Amplifier For Cd Player
• Manufacturer: Sony Electronics

Mirror Circuit
The mirror circuit performs peak and bottom hold after the RFI signal has been amplified.
For the peak hold, a time constant can follow a 30kHz traverse, and, for the bottom hold, one can follow the
rotation cycle envelope fluctuation.
Through differential amplification of the peak and bottom hold signals H and I, mirror output can be obtained by
comparing an envelope signal J (demodulated to DC) to signal K for Which peak holding at a level 2/3 that of
the maximum was performed with a large time constant. In other words, mirror output is low for tracks on the
disc and high for the area between tracks (the MIRR areas). In addition, a high signal is output when a defect
is detected. The mirror hold time constant must be sufficiently large in comparison with the traverse signal.
RFI
RFO
39
(BOTTOM HOLD)
(MIRROR HOLD)
(PEAK HOLD)
MIRROR AMP
2.2
K
J
I
H
(RFI)
MIRR
G
RFO
G
PEAK &
BOTTOM
HOLD
– 17 –
H
I
1
J
MIRROR
COMPARATOR
MIRROR HOLD AMP
20k
K
DGND
0V
0V
0V
0V
H
L
29
38
CP
MIRR
0.033µ
CXA1372BQ/BS