A bandwidth-compensated transimpedance amplifier for multigigabit optical receivers

In this paper, a transimpedance amplifier with an automatic bandwidth compe nsation circuit is presented. The proposed topology includes a transimpedan ce amplifier which features a bandwidth control input, and a replica bias c ircuit to sense the active device dc parameter variations. A Monte Carlo an alysis shows a 140 MHz bandwidth variation around 8.1 GHz when a +/- 50% va riation is considered for the transconductance and threshold voltage of the HEMT devices. The same simulation shows a 490 MHz bandwidth variation if t he compensation circuit is removed. (C) 2001 John Wiley & Sons, Inc.