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高频系统中广泛使用着双调谐电感耦合电路作为放大器级间耦合元件。这种电路的理论,很多著作都作了详细的论述。但是在两个回路的自然频率不同,并且Q值也不相等的条件下,求解回路电流最大值的频率是相当复杂的。所以一般的教科书和技术文献都不涉及这种情况。本文将把它当作一种高频放大器的耦合元件,以晶体管调谐放大器为例,对这种电路的一般理论进行分析。图1是双调谐谐振放大器的等效电路。g_mV是有源器件跨导模型所代表的电流源。g_1包括谐振电路本身的损耗和有源器件的输出电导,C_1包括谐振电路的电容和有源器件的输出
Dual-tuned inductive coupling circuits are widely used in high-frequency systems as coupling components between amplifiers. The theory of this circuit, many books have made a detailed discussion. However, when the natural frequencies of the two loops are different and the Q values are not equal, the frequency of solving the maximum loop current is rather complicated. Therefore, the general textbook and technical literature are not involved in this situation. This article will regard it as a kind of coupling element of the high-frequency amplifier, takes the transistor tuning amplifier as an example, analyzes the general theory of this kind of circuit. Figure 1 is an equivalent circuit of a double-tuned resonant amplifier. g_mV is the current source represented by the transconductance model of an active device. g_1 includes the loss of the resonant circuit itself and the output conductance of the active device, C_1 includes the capacitance of the resonant circuit and the output of the active device