摘要
提出了一种改进频标比对器的新方法:利用正反相切换电路来消除相位比对中鉴相器存在的“死区”问题,同时用标频信号对两比对信号经过鉴相器输出的矩形脉冲进行填充,并在给定时间内对填充脉冲进行计数。利用计数值进行曲线拟合,便得到无“死区”相位比对曲线。该方法能很好地消除死区现象,方便地绘制出相位比对曲线,并且能计算出两比对信号的频差。
This paper presents a new method for improving the frequency standard comparison instrument. The positive-negative phase switch circuit is used to eliminate the ＂dead-region＂ problem in the phase-detecting instrument. Standard frequency is used to fill the rectangle pulses which are produced by the phase-detecting instrument and these pulses are calculated in given time. The phase comparison curve can be observed by using calculated values to simulate the curve, By this method the ＂dead region＂ can be eliminated and the phase-comparison curve can be drawn with convenience and the difference between the two compared frequencies can be calculated.
出处
《电子科技》
2006年第3期21-24,共4页
Electronic Science and Technology
关键词
频标比对
鉴相
曲线拟合
Comparison of frequency standard
phase-detecting
dead-region
