谐振电路/LC谐振回路

谐振电路，也称为LC谐振回路，由电感(L)和电容(C)并联或串联组成，设计用于在由L和C值决定的特定谐振频率下振荡。在压控振荡器(VCO)中，它作为频率决定元件，通过改变电容或电感来调谐谐振频率，通常通过由输入电压控制的变容二极管实现。

LC谐振回路基于谐振原理工作，能量在电感的磁场和电容的电场之间以固有频率f = 1/(2π√(LC))振荡。在VCO中，通过改变电容（例如，使用电压控制的变容二极管）来调整谐振频率，使振荡器产生与控制电压成比例的稳定、可调的输出频率。

The LC tank circuit operates based on the principle of resonance, where energy oscillates between the inductor's magnetic field and the capacitor's electric field at a natural frequency f = 1/(2π√(LC)). In a VCO, the resonant frequency is adjusted by changing the capacitance (e.g., using a voltage-controlled varactor), allowing the oscillator to generate a stable, tunable output frequency proportional to the control voltage.