CXB1810FN 데이터 시트보기 (PDF) - Sony Semiconductor

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CXB1810FN

Post Amplifier for Optical Fiber Communication Receiver

Sony Semiconductor 

CXB1810FN

Notes on Operation

1. Limiting amplifier block

The limiting amplifier block is equipped with an auto-offset canceler circuit. When external capacitors C1 and

C2 are connected as shown in Fig. 1, the DC bias is set automatically in this block.

External capacitor C1 and internal resistor R1 determine the input low cut-off frequency f2 as shown in Fig. 2.

Similarly, external capacitor C2 and internal resistor R2 determine the high cut-off frequency for DC feedback.

Since a peak may occur in the low frequency area of the gain characteristics depending on the f1/f2

combination, set the C1 and C2 values so as to avoid the occurrence of this peak. The typical values of R1,

R2, C1 and C2 are indicated below.

Also, when a single ended input is used, provide AC grounding by connecting Pin 14 to a capacitor which has

the same capacitance as capacitor C1.

R1 (internal): 50Ω

C1 (external): 0.01µF

f2: 318kHz

R2 (internal): 10kΩ

C2 (external): 0.022µF

f1: 723Hz

C1

15

C1

14

R1

12

C2

11

R1

R2

R2

Fig. 1

DC feedback frequency

response

Amplifier frequency

response

To inside the IC

f1

f2

Frequency

Fig. 2

–9–

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