M02015 Datasheet, PDF (26/29 Pages) M/A-COM Technology Solutions, Inc. – Low Power CMOS Transimpedance Amplifier with Rx Pwr Mon Output and AGC for Fiber

M02015
Low Power CMOS Transimpedance Amplifier with Rx Pwr Mon Output and AGC for Fiber
Optic Networks up to 2.5 Gbps
Rev V6
4.6
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:
Figure 4-5. TIA Use with Externally Biased Detectors, Powered Off
PINA Unbiased
100
50
-800
-600
-400
-200
0
0
-50
200
400
600
800
1000
1200
-100
-150
-200
-250
-300
mV
In the positive direction the impedance of the input is relatively high.
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