Control of trans-impedance amplifier (TIA) during settling after recovering from loss of signal in receiver

An optical receiver, comprising:

• a photodiode;
• a transimpedance amplifier (TIA) including an output stage and a feedback amplifier and being coupled to the photodiode;
• a slope detection circuit coupled to the feedback amplifier and configured to monitor a feedback signal from the feedback amplifier, wherein the slope detection circuit is configured to provide, in response to a slope in the feedback signal being detected, a first slope-status signal indicating the slope is detected;
• and
• a logic circuit being coupled to the slope detection circuit and being coupled to the output stage of the TIA, the logic circuit being configured to squelch the output stage of the TIA in response to the first slope-status signal.

A method of controlling an output of a transimpedance amplifier (TIA), the method comprising:

• sending, in response to a first indication signal asserting loss of signal (LOS), a squelch signal to an output buffer of the TIA to squelch an output voltage of the TIA;
• and
• sending, in response to a second indication signal de-asserting LOS and a first slope-status signal indicating a slope is detected, a squelch signal to the output buffer of the TIA to squelch the output voltage of the TIA;
• sending, in response to the second indication signal de-asserting LOS and a second slope-status signal indicating the slope is not detected, an unsquelch signal to the output buffer of the TIA to unsquelch the output voltage of the TIA.