【作者】 王晓明；

【导师】 李芹； 黄斌；

【作者基本信息】 东南大学 ， 电子与通信工程（专业学位）， 2016， 硕士

【摘要】 随着光纤通信系统的广泛运用和迅猛发展,信息的交换越来越快。人们对短距离光通信系统的需求变得十分迫切。这就使得高性能的光电子组件和模块的需求飞速增长。随着塑料光纤在短距离光通信中展现出了优越的性能,局域光网络、光纤到户、车载光网络等短距离光通信系统得到了进一步的发展。短距离光通信系统的普及必然需要有新的高速光接收机和它相匹配。用标准CMOS工艺设计光接收机在成本上更低,与后续的数字电路集成更加简单易行。同时,随着CMOS光检测器的研究和应用,单片集成的光接收机已经成为今后设计的一个方向。单片集成光接收机的模拟前端放大器是光接收机的关键部分,主要包括了：光检测器、跨阻前置放大器、均衡器和主放大器组成。光接收机模拟前端放大器在很大程度上决定了整个单片集成光接收机的性能。光检测器的作用是将光信号转换成电流脉冲信号。这里采用标准CMOS工艺设计了一种双光电二极管结构的光检测器。跨阻放大器接收光检测器输出的微弱电流信号并将其转变为电压信号,同时进行一定的放大。跨阻放大器采用改进型调节型共源共栅结构,该结构有更低输阻抗和更高输出带宽的优点。均衡器采用连续时间线性均衡结构,该结构设计简便,芯片面积小。主放大器采用限幅放大器结构,限幅放大器的优点有设计简便,功耗较低,芯片面积小等。本次设计采用TSMC0.18μm CMOS工艺对上述电路进行了电路结构设计和电路版图设计。采用Cadence平台下的Virtuso 和 Spectre软件进行仿真。后仿结果表明,前端放大器整体的增益为94.7dBΩ,-3dB带宽为7.7GHz,符合指标要求。在电源电压为1.8v时,整个前端放大器的直流功耗为151mw。更多还原

【Abstract】 With the rapid development and wide application of optical fiber communication system, information exchange becomes more and more fast. At present, people’s demand for short distance optical communication system becomes more and more urgent. This results in the rapid growth of the demand of high quality optoelectronic components and modules.As the plastic optical fiber(POF) shows good performance in the short distance optical communication system, Local optical network, optical fiber to the home and Vehicular optical networks have been further developed. New high-speed optical receivers are required because of the popularity of short distance optical communication system. Optical receiver designed in standard CMOS process has lower cost, and the integration with the digital circuits are easy to implement. Now, With the research and application of CMOS optical detector, monolithic integrated optical receiver has become a new proposition of IC design.The front-end amplifier of the optical receiver is the key part of monolithic integrated optical receiver, and it includes photodetector(PD), transimpedance amplifier(TIA), equalizer and the main amplifier. The front-end amplifier determines the performance of the whole optical receiver.Optical detector is used to convert optical signal into current signal. In this paper, a kind of photodetector with double photodiode structure is implemented in standard CMOS technology. The transimpedance amplifier is used to convert current signal into voltage signal, and enlarge the signal at the same time. The modified regulated cascode(RGC) structure is chosen because it has low input impedance and broad bandwidth. Continuous time linear equalization(CTLE) structure is used as equalizer because of its simple structure and small chip area. The limiting amplifier(LA) structure is applied because of its simple structure and low power consumption.The circuit structure and layout design is based on TSMC 0.18μm CMOS process. In this paper, Virtuso and Spectre software are used under the Cadence platform for simulation. The simulation results indicate that the trans-impedance gain of the front-end amplifier is 94.7dBΩ and the-3dB bandwidth is 7.7GHz. The whole dissipation is 151mW when the supply power is 1.8V.更多还原