M02006 Datasheet, PDF (12/16 Pages) M/A-COM Technology Solutions, Inc. – CMOS Pre-amplifier with AGC for Long-reach 155 Mbps Fiber-optics Based Transmitter

M02006
CMOS Pre-amplifier with AGC for Long-reach
155 Mbps Fiber-optics Based Transmitter
Rev V4
4.4
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 as shown in Figure 4-4.
Figure 4-4. 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
12
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