CXA1992 SONY [Sony Corporation], CXA1992 Datasheet - Page 16

• Manufacturer Part Number: CXA1992
• Description: RF Signal Processing Servo Amplifier
• Manufacturer: SONY [Sony Corporation]

Description of Functions
RF Amplifier
The photo diode currents input to the input pins (PD1 and PD2) are each I-V converted through a 58kΩ
equivalent resistor by the PD I-V amplifiers. These signals are added by the RF summing amplifier, and the
photo diode (A + B + C + D) current-voltage converted voltage is output to the RFO pin. An eye-pattern check
can be performed at this pin.
The low frequency component of the RFO output voltage is V
1k
3.3µ
C
D
A
B
iPD1
iPD2
PD1
PD2
38
39
VC
VC
PD1 IV AMP
PD2 IV AMP
58k
58k
– 16 –
VA
VB
10k
10k
RFO
= 2.2
VC
34
(V
RF_M
A
RF SUMMING AMP
+ V
22k
B
) = 127.6kΩ
33
RF_O
(iPD1 + iPD2).
CXA1992AR