收音机组装毕业设计报告.doc

摘要 3 Abstract 4 一.设计目的与要求 6 二.原理分析 6 2.1发射机原理 6 2.1.1 各模块原理分析 6 2.2.2 BH1417芯片结构和各引脚功能 7 2.2.3 protel99se发射原理图的绘制 9 2.2.4 PCB板的制作 10 2.2 接收机原理 11 2.2.1调幅工作原理 11 2.2.2调频工作原理 13 2.2.3 CXA1691芯片结构和各引脚功能 15 2.2.4 protel99se接收原理图的绘制 17 2.2.5 PCB板的制作 18 三．焊接及组装 18 3.1 步骤和注意事项 18 3.2 元器件的摆放 20 四．调试 20 3.1 基本调试 21 3.2调试中出现的故障、原因及排除方法 21 3.3装配完成后，经常出现的问题 22 3.4 分析调试步骤 22 五．总结 27 附录 1 28 附录 2 29 参考文献 31 摘 要 本课设从高灵敏度FM/AM教学收音机的组装，原理分析，调试，调试步骤分析几方面对收音机进行了分析说明。用BH1417和CXA1691来实现发射机和接收机。 BH1417是ROHM公司推出的新型FM无线发射芯片，它是由提高信噪比（S/N）的预加重电路、防止信号过调的限幅电路、控制输入信号频率的低通滤波电路（LPF）、产生立体声复合信号的立体声调制电路、调频发射的锁相环电路（PLL）等电路组成。文章给出了 BH1417 的结构、原理、特性。基于 BH1417芯片，配以简单的外围电路，即可实现 FM 无线发射，具有高可靠性和极低的功耗。CXA1691是调频调幅收音机用集成电路。 集成电路体积小、功耗低、可靠性高、性能好以及易于使系统整机实现少调整和不调整等优点。 关键词：发射机；接收机；BH1417;CXA1691 Abstract This design introduces the high sensitivity FM/AM teaching radios assembly, the principle analysis, the debugging, the debugging step analyzes several aspects to carry on analysis showing to the radio. Realize the transmitter and the receiver with BH1417 and CXA1691. BH1417 is the new FM wireless launch chip which ROHM Corporation promotes, it is by enhances the signal-to-noise ratio (S/N) the pre-emphasis, prevents the signal the limiter circuit which, the control input signal frequency low-pass filtering electric circuit moves (LPF), to produce the phase-locked loop electric circuit which the stereo sound serrated signals stereo sound tone circuit, the frequency modulation launch (PLL) and so on electric circuits to be composed. The article has given the BH1417 structure, the principle, the characteristic. Based on the BH1417 chip, matches by the simple peripheral circuit, then realizes the FM wireless launch, has the redundant reliability and the extremely low power loss. CXA1691 is the frequency modulation amplitude modulation radio uses the integrated circuit. The integrated circuit relies on the volume to be small, the power loss is low, the reliability is high, the performance goo