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本文提供了用模拟相乘器与运算放大器相配合组成的压控振荡器电路，可以产生一对相 移为９０°的正弦和余弦的正交信号，其振荡频率和幅度均可直接通过改变外加电压在一个很宽 范围内连续可调，且具有线性好，频率漂移小等优点．本电路实验结果与理论分析相符．
This article provides a voltage-controlled oscillator circuit composed of an analog multiplier and an operational amplifier that generates a pair of quadrature sine and cosine signals with a phase shift of 90 °. Both the oscillation frequency and the amplitude can be directly changed by adding The voltage is continuously adjustable over a wide range and has the advantages of good linearity and small frequency drift. The circuit experimental results and theoretical analysis.