用于中频数字AGC环路的高效检波方法

提出了一种用于中频数字式自适应增益控制(automaticgaincontrol,AGC)环路的高效数字检波方法。首先讨论了用绝对值方法实现频谱变换的基本原理,确定了频谱的位置;然后讨论了高效数字滤波器(累积梳状滤波器)的设计,并给出了相应的实现结构。分析结果和计算机仿真结果表明,只要合理地选择单级累积梳状滤波器(CIC)的长度N和级联数Q,就可以获得较好的检波性能。

Highly effective digital demodulation technique used in digital AGC

This paper investigates a highly effective digital demodulation technique used in digital automatic gain control(AGC). Firstly, the basic principle of spectrum transform through absolute operation is discussed and the spectrum positions are determined. Then the design of a highly effective digital filter (cascaded integrator-comb) is discussed and the corresponding implementation structures are given. The results of analysis and computer simulation indicate that better demodulation performance can be achieved if the coefficient length of single CIC and the cascade number are determined correctly, and it is economical and highly effective.