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电容耦合双调谐电路具有特殊的调谐特性,长期以来没有引起人们的注意。在耦合电容较大时,电容耦合双调谐电路具有双峰的频率特性。但是,当耦合电容改变时,这种电路的频率特性上的一个峰的位置固定不动,而另一个峰的位置则往低频方向移动。这种调谐特性易于满足用残留单边带传输方式传送电视信号时,对电视接收机图象中频放大器频率特性的特殊要求。因此,电容耦合双调谐电路广泛地使用在国内、外生产的晶体管彩色或黑白电视接收机的图象中频放大器中。
Capacitively coupled double tuned circuits have special tuning characteristics that have not attracted the attention of people for a long time. When the coupling capacitance is large, the double-tuned circuit has a double-peaked frequency characteristic. However, when the coupling capacitance is changed, the position of one peak in the frequency characteristic of such a circuit is fixed while the position of the other peak is shifted in the low frequency direction. This tuning feature is easily met by the residual single-sideband transmission of television signals transmitted, the television receiver IF IF frequency characteristics of the special requirements. Therefore, capacitively coupled double-tuned circuits are widely used in image IF amplifiers for both domestic and external transistor color or black-and-white television receivers.