CXA1992BR Просмотр технического описания (PDF) - Sony Semiconductor

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CXA1992BR

RF Signal Processing Servo Amplifier

Sony Semiconductor 

CXA1992BR

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.

1k

3.3µ

A

58k

PD1

C

38

iPD1→

VA 10k

V1

B

PD1 IV AMP

VC

58k

PD2

D

39

iPD2→

VB 10k

V2

PD2 IV AMP

VC

22k

RF_M

34

RF_O

33

FOK

DEFECT

RF SUMMING AMP

V3

The low frequency component of the RFO output voltage is VRFO = 2.2 × (VA + VB) = 127.6kΩ × (iPD1 + iPD2).

VRFO = –

22k

10k

(VA + VB – 2V3) +V3

= –2.2 {–58kΩ (iPD1 + iPD2) + V1 + V2 – 2V3} + V3.

V1 = V2 = V3 are set , and VRFO = 127.6kΩ × (iPD1 + iPD2) + V3

– 16 –

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