两种典型的数字调谐系统  

Two Kinds of Typical Digital Tuned Systems

作　　者：罗山鹰[1] 周军[2] 

机构地区：[1]北京理工大学机电工程学院,北京100081 [2]中国北方工业公司,北京100053

出　　处：《兵工自动化》2001年第4期46-50,共5页Ordnance Industry Automation

摘　　要：在分析电压合成、PLL频率合成、自调谐三种数字调谐系统(DTS)工作原理的基础上,利用PLL芯片TC9418FN和新一代自调谐概念的收音机芯片TEA5757HL,分别设计了2套DTS收音机(FM only)方案。方案一采用TC9418FN+TA2104+TA8198三块芯片构成,实现了预置频率和自动搜台。方案二采用TEA5757HL单芯片构成,由于它将从RF输入到音频输出的模拟收音机电路和数字调谐电路集成于单芯片中,减少了外围电路和功耗,缩短了搜台时间,提高了信噪比。并对两方案进行了讨论。On the basis of analyzing the principium of 3 kinds of digital tuned systems (voltage synthesizer and PLL and self tuned) in detail, two projects of digital tuned system (DTS) for radio-set (FM only) were respectively designed with PLL chip TC9418FN and self tuned chip TEA5757HL. The chips TC9418FN+TA2104+TA8198 were used in the first project, and presetting frequency mode and automatic searching mode was implemented in this project. The chip TEA5757HL was used in the second project, in which circuit of circuit analog receiver (from RF input to audio output) and digital tuning circuit are integrated in the chip. So, periphery circuit and searching time was shortened, power consuming was reduced and its signal-to-noise rate was improved. The two projects were discussed in this paper.

关 键 词：数字调谐系统 锁相环 自动频率控制 TC948FN芯片 TEA5757HL芯片 收音机 

分 类 号：TN850.4[电子电信—信息与通信工程]