设计任务:无线话筒在现实生活中应用十分广泛,我国的调频收音机的接收范围是88MHz到108MHz,根据所学的知识,设计一款简易的调频无线话筒,使工作频段在接收机的接收频段内,在收音机中收听到无线话筒发出的语音信号。
基本要求
(1)频带范围 88MHz ~ 108MHz以内。
(2)话筒有效工作距离 > 5米。
(3)最大频偏:< 50KHz。
发挥部分
(1)能在两个以上的频点切换。
(2)工作距离> 20米
(3)其他。
[摘要] 高频电子线路系统地介绍了通信系统,特别是无线通信系统中的最基本电路及他们的功能,给出了定性及定量分析这些电路性能的方法。
这些电路包括了发射机及接收机中的选频放大电路、混频电路、功放电路、振荡电路、调制及解调电路、锁相环电路、自动增益控制电路及频率合成电路。
本课程设计的基本目标是:通过理论和实践教学,使我们了解晶体管工作于高频时的工作原理,特性参数及微变等效电路,掌握高频单元电路的线路组成、基本工作原理、分析方法、技术要求及一些典型集成电路的实际应用,并且具备一定的理论水平和足够的实践技能,为进一步学习电子技术的专业知识和职业技能打下基础。
[关键词]无线调频话筒、PCB 绘图、电路分析
[Abstract] High Frequency Circuit systematic introduction to communication systems, particularly wireless communication systems and their basic function of the circuit, given the qualitative and quantitative analysis of these methods of circuit performance. The circuit includes a transmitter and receiver in frequency selective amplifier, mixer circuits, power amplifier, oscillation circuit, modulation and demodulation circuits, phase locked loop circuit, automatic gain control circuits and frequency synthesis circuit. The basic design of this course are: the theory and practice through teaching, so we know when the transistors operate at high working principle, characteristics and micro-dependent equivalent circuit parameters, frequency control circuit of the line unit composition, the basic working principle methods, technical requirements, and some typical IC, and have a certain theoretical level and enough of the practical skills, communication
technologies for the further study of expertise and professional skills basis. [Key words] Wireless FM microphone, PCB drawings, circuit analysis ii。