A 25 Gb/s burst-mode TIA+CDR optical receiver with 4.5 ns total reconfiguration time

We present a high-speed burst-mode optical receiver operating at 25-Gb/s with the shortest reconfiguration time of 4.52-ns reported up to date. The receiver consists of a burst-mode trans-impedance amplifier (TIA) with 1/8-rate clock-assisted DC offset cancellation loop as well as automatic gain control loop, and a burst-mode clock-data recovery (CDR) with two-stage injection-locking architecture. Both designed and fabricated in a 28-nm CMOS process, the TIA + CDR optical receiver consumes 101-mW from a 0.9-V supply. With a continuous-time linear equalizer, series inductive peaking and shunt inductive peaking, the 3-dB bandwidth of Z_T(O-E) of TIA is 20 GHz with 14-dB gain dynamic range (45–59 dB). The sensitivity of the burst-mode receiver is −10.1 dBm at BER = 1E-12.