A transimpedance amplifier (TIA) as preamplifier for optical receivers in passive optical networks designed in a digital 120 nm CMOS technology is described. Varying the open-loop gain of the preamplifier by a factor of 340 is suggested as a solution for the stability problem of this variable gain TIA. Sensitivities of −29.9 dBm at 622 Mbit/s and −28.2 dBm at 1.25 Gbit/s with 1.3 µm light and a bit error ratio of 10−10 are achieved.
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