摘要
900M ISM频段工业干扰小,应用广泛,但模拟收发电路设计与调试困难,尤其是接收装置,二次变频接收可以提高接收灵敏度,减少像频干扰,改善接收效果,使用PLL技术获得稳定接收效果,全集成收发设计方案,结构简单,产品可嵌入到无线话筒、乐器拾音器等设备,电路结构简单,调试方便,应用前景广泛。
The 900M ISM band has little industrial interference and been used widely, but the analog transceiver circuit design and debugging are difficult, especially in the receiving device. Dual conversion receiver can improve the receiver s6nsitivity, reduce the mirror frequency interference and better reception. Using PLL technology can get stable reception with fully integrated transceiver design scheme, simple structure, embedding into the wireless microphone, musical pickup and other equipment, convenient debugging and it has wide application prospect.
出处
《长沙通信职业技术学院学报》
2012年第3期28-33,共6页
Journal of Changsha Telecommunications and Technology Vocational College
关键词
UHF
二次变频
像频
锁相环
UHF
dual conversion
mirror frequency
PLL
