M02015

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21

Low Power CMOS Transimpedance Amplifier with Rx Pwr Mon Output and AGC for Fiber

Optic Networks up to 2.5 Gbps

Rev V6

4.2

Selecting the Monitor Resistor

As described earlier the high impedance monitor output sources a replica average photodiode current for

monitoring purposes. If detected by converting the current to a voltage through an external resistor (Figure 4-1),

monitor resistor.

Table 4-1.

Selection of Rm for Maximum Input Current

Optical Power (dBm)

Rm (

Ω)

4

+6

500

2

+3

1000

1

0

2000

0.5

-3

4000