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基本结构鉴频器的基本结构如图1所示。限幅放大器的输出幅度是固定的,不随输入信号的频率和幅度的变化而改变,需要采用限放的原因是:其混频器不仅对相位敏感,而且还对幅度敏感。
The basic structure of the basic structure of frequency discriminator shown in Figure 1. The output amplitude of the limiting amplifier is fixed and does not change with the frequency and amplitude of the input signal. The reason why the limiter is used is that the mixer is not only phase sensitive but also amplitude sensitive.