Burst-mode TIA (trans-impedance amplifier)

Devices and methods for processing signals using a Burst-Mode TIA that meets EPON and GPON specifications are disclosed herein. A signal provided by a power detector is processed with the appropriate gain by using a gain selector which includes a feedback circuit to choose the gain internally, thereby eliminating the need for an external control. Further embodiments of the invention include power detectors featuring a low-pass filter, a peak detector, and/or an envelope detector. Further embodiments of the invention include a Freeze function circuit for maintaining a current gain. Further embodiments of the invention apply appropriate gains when bursts with substantially different power levels are received consecutively, and prevent the gain from being changed during a burst. In this method, a two-pole low-pass filter with an undamped response function is used.