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RC 系统的理论甚是完善,其应用极为广泛。常见的是振荡器、滤波器、选频放大器等。本文是引用了双 T_2导出 R,C 网络,根据文献分析了它的特性,并进一步将它配成在某指定频率有最大放大倍数的选频放大器。在导出放大器的 Q 值与 RC 元件参数以及与无选频网络时放大器的放大倍数 K_0间的关系后,指明了如何设计此种放大器。作了一系列实验,观察了双 T_2型网络的幅度,相位一频率特性。并作成了一部中心频率 f_0=800 c/s,通频带26c/s,放大倍数达10~5的选频放大器,满足了实际的需要。
The theory of RC system is perfect, its application is very extensive. Common oscillator, filter, frequency selective amplifier. This paper refers to the dual T 2 derived R, C network, according to the literature analysis of its characteristics, and further dubbed it at a specified frequency has the largest amplification factor of the frequency-selective amplifier. After deriving the Q value of the amplifier and the relationship between the RC element parameters and the amplification factor K_0 of the amplifier in the case of the non-frequency selective network, it is indicated how to design such an amplifier. A series of experiments were carried out to observe the amplitude, phase and frequency characteristics of double T 2 type networks. And made a center frequency f_0 = 800 c / s, passband 26c / s, amplification factor up to 10 ~ 5 frequency selective amplifier, to meet the actual needs.