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以物理概念为基础，利用数学手段证明了二阶压控电压源ＬＰＦ转化为正弦波振荡器的条件，同时给出了振荡频率的计算式。
Based on the concept of physics, the condition of LPF transformed into a sine wave oscillator by a second-order voltage-controlled voltage source is proved by mathematical means. At the same time, the formula of oscillation frequency is given.