无线通信实践教学模块设计——基于1800的调频收音机对讲机系统设计毕业设计.doc

宁波理工学院 宁波理工学院 毕业设计（论文） 题 目 无线通信实践教学模块设计—— 基于D1800的调频收音机对讲机系统设计 分 院 信息科学与工程分院 完成日期 2010年6 摘 要 调频收音机对讲机的出现使无线通信技术更加广泛的应用于实际系统之中。 论文介绍了调频收音机对讲机的市场性和广泛性，提出将调频收音机对讲机系统设计列为无线通信教学模块，作为高校科研实验素材的设想，让学生从基础的教学模块设计中掌握系列的无线通信实践系统，激发学生学习无线通信的兴趣，并提高学生理论结合实际的能力，从而进一步加强学生的无线通信实践水平，提高学生实际动手能力，不断扩大无线通信市场，为培养更多无线通信市场专业人才打下基础。 论文完成了系统的原理图及PCB的设计。在设计时考虑了系统的抗干扰性和电磁兼容性，从元器件的布局及走线等方面来采取措施。 论文设计了一款基于D1800的音频信号处理硬件平台，该平台有接收电路，发送电路，调制电路，混频电路，放大电路，振荡电路等，其中主要以接收电路和发送电路为主。该系统第一级为振荡兼放大电路，第二级为发射电路，调频波段为88MHz—108MHz，工作电源电压为2.5V—5V，信噪比80dB，对讲距离为50—100米。 关键词： 无线通信；硬件系统；音频信号；调频；教学模块； Abstract The emergence of FM radio wireless communications technology is more widely used in the actual system being. The paper introduces FM radio and extensive market, proposed as an FM radio intercom system wireless communication teaching module, and as the idea of university research laboratory material; Students from the teaching modules based on the design of practical control systems of wireless communication series, and stimulating students interest in wireless communications, and enhance the students ability to combine theory with practice; Thus further strengthening the level of the students wireless communications practice to enhance students practical ability, expanding wireless communications market, the wireless communications market to cultivate more professional basis. In this paper, the system completed the schematic and PCB design. Taking into account in the design of anti-jamming systems and electromagnetic compatibility, from the layout and alignment of the components, etc. to take measures. In the paper, one based on D1800 audio signal processing hardware platform, The platform to receive the circuit, sending circuit, modulation circuit, mixer circuit, amplification circuit, oscillation circuit, mainly to receive circuit and the transmitting circuit. The first stage of the system oscillation and amplification circuit, the second stage for the launch of the circuit,