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本文所述频差检测器与频率比较的数字计数器相比,虽然精度受到限制,但它十分简单,调整方便.同时,在许多应用中,象伺服电路中,它能直接输出模拟量.另外,当一个频率固定,在音频或低于音频时,可用来作为甄别器,而这正是惯常的甄别器由于变换上的麻烦所不及的. (一)原理和检测特性频差检测器的方块图和检测特性如图1.两个独立的单稳电路提供与各自输入周期(T_1=1/f_1,T_2=1/f_2)相同、具有恒定的宽度(t_(p1)、t_(p2))和幅度(V_(p1)、V_(p2))
Compared with the frequency comparison digital counter, the frequency difference detector described in this paper is very simple and easy to adjust although its accuracy is limited.At the same time, in many applications, like the servo circuit, it can directly output the analog quantity.In addition, When a fixed frequency, at or below audio, can be used as a discriminator, and this is the usual discriminator due to the transformation of the trouble. (A) principle and detection characteristics of frequency difference detector block diagram And the detection characteristics are shown in Figure 1. Two independent monostable circuits provide the same width (t_ (p1), t_ (p2)) as the input periods (T_1 = 1 / f_1, T_2 = 1 / f_2) Amplitude (V_ (p1), V_ (p2))