CAJ | 학술논문

全通滤波器是锁相放大器、信号发生器等仪器产生等幅正交正弦波信号的常用电路。当信号频率改变时，通常需要手动调节全通滤波器的参数。本文提出一种可自动跟踪频率的全通滤波器，采用相敏检测电路检测两路正弦波信号的相位差，根据相位差自动调节电子模拟电阻的阻值，从而维持全通滤波器输入输出正弦信号相互正交。实验结果表明，该900移相全通滤波器跟踪频率范围较宽、相位及幅值精度较高，具有良好的应用价值。
전통려파기시쇄상방대기、신호발생기등의기산생등폭정교정현파신호적상용전로。당신호빈솔개변시，통상수요수동조절전통려파기적삼수。본문제출일충가자동근종빈솔적전통려파기，채용상민검측전로검측량로정현파신호적상위차，근거상위차자동조절전자모의전조적조치，종이유지전통려파기수입수출정현신호상호정교。실험결과표명，해900이상전통려파기근종빈솔범위교관、상위급폭치정도교고，구유량호적응용개치。
All-pass Filter is often used as a continuous orthogonal signal circuit for such instruments as lock-in amplifier and signal generator. It usually requires manual adjustment of all-pass filter parameters When the frequency changes. In this paper, an all-pass filter of automatic frequency tracking is presented. The filter which uses a phase-sensitive detection circuit for detecting the phase deference of two sinusoidal signals and adjusts automatically the resistance values of the electronic resistor based on phase difference in order to maintain mutually orthogonal signals of the input and output. The experiment results show that the 900 phase-shift all-pass filter of automatic frequency tracking have such advantages as wide frequency tracking range and high phase and amplitude precision, and is very useful in practice.