摘要
高性能接收端前置放大器的实现在光纤通信系统中起着至关重要的作用,前置放大器的性能指标,如,噪声、带宽、增益等,在很大程度上影响着光纤通信系统的性能。在分析了各种结构前置放大器性能的基础上,给出了一个基于CMOS工艺的、RGC结构的,应用于2.5Gbit/s光纤通信系统的低噪声跨阻放大器的实现方式。为了减小输入等效噪声电流和提高带宽,采用了有源反馈代替电阻反馈。采用SMIC的0.18μmCMOS工艺仿真结果表明该电路具有60.18dB的跨阻增益,2.13GHz的带宽,输入等效噪声电流为8.9pA/Hz,电路功耗仅为15.3mW。
High performance preamplifier is a critical block in optical communication system, and the parameters of it, such as noise, bandwidth and gain, affect the performance of the optical communication system in a large extent. Basing on the analysis of the topologies of preamplifiers, a CMOS RGC transimpedance amplifier, which can be used in 2. 5Gbit/s optical communication system, is presented. In order to reduce the input equivalent noise current and feedback is used instead of conventional resistor feedback. Simulation process of SMIC show that the transimpedance gain is 60.18dB, the equivalent noise current is 8.9pA/√Hz enlarge the bandwidth, an active results using the 0. 18μm CMOS bandwidth is 2.13GHz, the input and the power consumption is only 15.3 mW.
出处
《微处理机》
2008年第4期11-14,共4页
Microprocessors
