论文部分内容阅读
目前在频率分割的多路通信中,都采用频率合成器来改变发射机载波频率和接收机本级振荡频率去实现通信功能。MC145157是功能比较齐全的新CMOS、LSI锁相频率合成器产品。通过改变加到参考分频器和程序分频器的分频数据获得不同的参考频率(分辨率)和诸多的输出频率。本文(上)介绍的用硬件实现的控制方法及(下)介绍的单片机实现的控制方法在现代通信系统中应用十分广泛。
At present, in the frequency division multiplex communication, the frequency synthesizer is used to change the carrier frequency of the transmitter and the receiver’s own oscillation frequency to realize the communication function. The MC145157 is a full-featured new CMOS, LSI phase-locked frequency synthesizer product. Different reference frequencies (resolutions) and many output frequencies are obtained by changing the divided data to the reference divider and program divider. This article (on) describes the use of hardware control methods and (below) describes the microcontroller control methods used in modern communications systems is widely used.