关键词: 跨阻放大器, 光接收机, 带宽自适应控制, 增益自适应控制

Abstract: A transfer impedance amplifier (TIA) for 1.25 Gbps is proposed in the paper. Resistive shunt feedback architecture is used in TIA design. Adaptive bandwidth control circuit is used to stabilize bandwidth in PVT (Process, Voltage, and Temperature) conditions. Automatic gain control is also designed for higher dynamic range. The proposed TIA is designed and simulated based on 0.18μm CMOS process. When the capacitance of photodiode is 0.7 pF, simulation results of the proposed TIA show gain of 12.0 kΩ, bandwidth of 0.96 GHz, total noise current of 104 nA. The proposed TIA meets the requirements of 1.25 Gbps optical receiver.

Key words: transfer impedance amplifier, optical receiver, auto bandwidth control, auto gain control