M02016

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17

CMOS Transimpedance Amplifier with AGC

for Fiber Optic Networks up to 1.25 Gbps

Rev V4

4.5

TIA Use with Externally Biased Detectors

In some applications, MACOM TIAs are used with detectors biased at a voltage greater than available from TIA

PIN cathode supply. This works well if some basic cautions are observed. When turned off, the input to the TIA

exhibits the following I/V characteristic:

In the positive direction the impedance of the input is relatively high.

Figure 4-4.

TIA Use with Externally Biased Detectors, Powered Off

PINA Unbiased

-300

-250

-200

-150

-100

-50

0

50

100

-800

-600

-400

-200

0

200

400

600

800

1000

1200

mV