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采用0.35μm CMOS工艺设计并实现了一种新的应用于1.25Gb/s光纤通信接收机的高灵敏度、宽动态范围跨阻放大器电路。引入电流注入技术提高输入管跨导、优化噪声性能、提高灵敏度。自带直流反馈实现直流消除功能,同时采用自动增益控制机制,提高动态范围。仿真结果表明,该电路具有82.02dBΩ的跨阻增益、872.7MHz的带宽、23.74kHz的低频截止频率,输入等效噪声电流为4.08pA/Hz(1/2),最大输入光信号为+3dBm(2mA),在3.3V的电源电压下,芯片功耗为43.4mW。
A 0.35μm CMOS process is used to design and implement a new high sensitivity and wide dynamic range transimpedance amplifier circuit for 1.25Gb / s optical fiber communication receiver. The introduction of current injection technology to improve the transconductance of the input pipe, optimize the noise performance, improve the sensitivity. DC feedback with DC elimination function, while using automatic gain control mechanism to improve the dynamic range. The simulation results show that the circuit has a transconductance gain of 82.02dBΩ, a bandwidth of 872.7MHz and a low-frequency cutoff frequency of 23.74kHz. The input equivalent noise current is 4.08pA / Hz (1/2) and the maximum input optical signal is + 3dBm 2mA), the power consumption of the chip is 43.4mW under the power supply voltage of 3.3V.