可编程FM锁相发射机的实现

摘要

This paper designs a programmable FM transmitter based on PLL, implements serial communication between Atmega8 and computer,accomplishes PLL chip and digital potentiometer's configuration, achieves the change of PLL's frequency and modem ferequency offset The transmitter can generates signal from 2200 MHz to 2300 MHz, and it's modem frequency response bestrows from 100Hz to 3.5MHz, satisfies the meet of most FM telemetry system.%文中设计了一种可编程的FM锁相发射机.利用Atmega8实现与计算机的串口通信,实现对锁相环芯片和数字电位器的配置,达到改变输出频率和调制频偏的目的.发射机输出频率覆盖2 200～2 300 MHz,调制响应100 Hz～3.5MHz,能够满足大部分FM体制遥测系统的需要.