一种基于AGC的频率测量方法  

A Frequency Measure Method Based on AGC

作　　者：冒燕[1] 王建钢[1] 毛五星[1] 

机构地区：[1]空军雷达学院电子对抗系

出　　处：《微计算机信息》2006年第09S期18-19,共2页Control & Automation

基　　金：国防预研基金资助项目(编号不公开)

摘　　要：针对实验装置设计的要求,提出一种基于自动增益控制(AGC)的电压值测量频率的方法。电路主要由前端调谐器FI1276和单片机ADμC812组成,由ADμC812的I2C总线完成对FI1276的本振控制,同时ADC系统进行FI1276内的AGC电压值采集,根据AGC电压变化曲线实现对输入信号频率的测量。实验数据结果表明绝对测量误差值小于±0.5MHz,满足指标要求。In this paper, a frequency measure method based on Automatic Gain Control （AGC） voltage is provided to the request of experiment equipment design. The circuit is mainly composed of fore-tuner （FI1276） and Single Chip Micyoco （ADμC812）, the local oscillator is controlled by I^2C bus of ADμC812 and AGC voltage in FI1276 is sampled by Analog Digital Convert （ADC） system, then the input signal frequency measure may be realized in accordance with changing curve of AGC voltage. The result by experiment data shows that the absolute value of error is less than 0.5MHz and required target is attained.

关 键 词：频率测量 单片机 AGC ADC I^2C总线 

分 类 号：TP368[自动化与计算机技术—计算机系统结构]