A 25Gb/s Burst Mode Optical Receiver Front-End in 0.13\ \mu\mathrm{m}$ BiCMOS Technology

A new 25Gb/s burst mode optical receiver front-end is proposed in this paper, which consists of a transimpedance amplifier (TIA), an automatic gain control (AGC) and a DC offset cancellation (DCOC) buffer. High transimpedance gain of the TIA is designed to decrease input noise and acquire appropriate AGC gain range. Without conventional peak detector, a feedforward AGC stage is adopted to shorten the stabilization time and adapt to burst signal. Simulation results show that the proposed front-end circuit achieves low noise of $1.6\ \mu \text{AAMS}$ , setting time of 70ns. In 0.13\ \mu\mathrm{m}$ BiCMOS technology, the optical receiver front end consumes 300mW from a 3.3V supply.