基于CMOS工艺的光接收机系统设计

发布时间：2018-02-23 22:01

本文关键词： 光纤通信光接收机跨阻放大器可靠性　出处：《西安电子科技大学》2014年硕士论文　论文类型：学位论文

【摘要】：近年来，用于信息传递的各种通信方式均在蓬勃发展，光纤通信由于其体积小、重量轻、寿命长、容易维护、保密性好、抗干扰性强、容量大等优点，成为主要的通信方式。目前，应用于光纤通信的各类各种速率的芯片大部分为国外所产，所以我们急需开发此类具有自主知识产权的集成电路，以满足我国在光纤通信领域发展的需要。论文将光接收机的实际应用与科研项目相结合，设计了一款基于SPDIF协议应用于7.1声道多媒体设备的具有25Mbps速率级的光接收机芯片。前置跨阻放大器将光检测器输出的微弱光电流信号放大并转换成电压信号，为了提高其增益并降低其噪声特性，本文将传统的共源极基本放大器改进为共源共栅基本放大器。为了增加输入动态范围，创造性地设计了半球体方式的PIN光电二极管结构，增加了光接收面积，，并在电路中增加了自动增益控制电路。为了使芯片具有更高的抗噪工作性能，设计了噪声阈值控制电路。为了防止输出在驱动管开关动作时，通过衬底串扰耦合到输入级，产生误操作影响系统的稳定性，版图布局中将模拟电源、地与数字电源、地分开布置。芯片XD6626整体电路设计基于0.5μm CMOS工艺，采用Cadence软件，对芯片在输入不同大小和速率的输出状态以及关键技术指标进行了仿真验证。仿真结果表明，芯片各项指标均满足设计要求，性能良好。最后给出了样片的实测数据，其结果符合设计需求。
[Abstract]:In recent years, all kinds of communication methods used for information transmission are booming. Optical fiber communication has the advantages of small volume, light weight, long life, easy maintenance, good confidentiality, strong anti-interference, large capacity, etc. At present, most of the chips of various rates used in optical fiber communication are produced abroad, so we urgently need to develop such integrated circuits with their own intellectual property rights. In order to meet the needs of our country in the field of optical fiber communication development. This paper combines the practical application of optical receiver with scientific research projects. A 25Mbps rate level optical receiver chip based on SPDIF protocol is designed for 7.1 channel multimedia devices. The pre-transimpedance amplifier amplifies and converts the weak photocurrent signal from the photodetector into a voltage signal. In order to improve the gain and reduce the noise characteristics, the conventional common-source basic amplifier is modified to the common-grid basic amplifier. In order to increase the input dynamic range, the semi-sphere PIN photodiode structure is designed creatively. The optical receiving area is increased, and the automatic gain control circuit is added to the circuit. In order to make the chip have higher anti-noise performance, a noise threshold control circuit is designed. Through the substrate crosstalk coupling to the input stage, the misoperation will affect the stability of the system. In the layout layout, the analog power supply, ground and digital power supply will be arranged separately. The whole circuit design of XD6626 chip is based on 0.5 渭 m CMOS technology. The output state and key technical index of the chip are simulated and verified by Cadence software. The simulation results show that the output state and key technical index of the chip are different in size and rate. Each index of the chip meets the design requirements and the performance is good. Finally, the measured data of the chip are given, and the results are in line with the design requirements.
【学位授予单位】：西安电子科技大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TN851

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