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CXB1573R

Post-Amplifier for Optical Fiber Communication Receiver

Sony Semiconductor 

CXB1573R

Notes on Operation

1. Limiting amplifier block

The limiting amplifier block is equipped with the 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

IC internal resistor R1 determine the low input cut-off frequency f2 as shown in Fig. 2. Similarly, external

capacitor C2 and IC internal resistor R2 determine the high cut-off frequency f1 for DC bias feedback. Since

peaking characteristics may occur in the low frequency area of the amplifier gain characteristics depending on

the f1/f2 combination, set the C1 and C2 values so as to avoid the occurrence of peaking characteristics. The

target values of R1 and R2 and the typical values of C1 and C2 are as indicated below. When a single-ended

input is used, provide AC grounding by connecting Pin 13 to a capacitor which has the same capacitance as

capacitor C1.

R1 (internal): 1kΩ

C1 (external): 0.047µF

f2: 3.4kHz

R2 (internal): 7.5kΩ

C2 (external): 1µF

f1: 21Hz

D

14

C1

13

C1

12

C2

11

R1

R1

R2

R2

Fig. 1

To IC interior

Feedback frequency

response

Amplifier frequency

response

f1 f2

Frequency

Fig. 2

– 12 –

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