摘要
以RC桥式振荡电路为对象,定量研究正弦波振荡电路输出电压的幅值特性。从电路中正反馈和负反馈平衡的角度,观察起振和稳定全过程,得出稳态正弦波幅值与负反馈回路中电阻的初始阻值及其时变/非线性特性两个因素有关,并通过推导给出决定幅值的一般关系式和3种典型RC桥式振荡电路幅值的定量计算公式。所做虚拟实验验证所得结论的正确性。
Taking Wien Bridge oscillator as research object, the amplitude and properties of its output voltage were researched quantitatively. From the angle of the balance between positive feedback and negative feedback in the circuit, the whole work process of Wien Bridge oscillators were observed, and the conclusion was pointed out that the amplitude of the sinusoidal wave is related to two factors, i.e., the initial resistance and the time-varying/nonlinear characteristics of the resistor in negative feed- hack. The paper gave a general equation of the amplitude, and calculations of the amplitude of three typical kinds of Wien Bridge oscillators. The results of virtual experiment verified the above conclusions.
出处
《电子设计工程》
2015年第13期151-154,共4页
Electronic Design Engineering
基金
江苏省教育厅研究生创新基金资助(CZXX12-0815)
关键词
正弦波
振荡电路
电桥
幅值
时变
非线性
sinusoidal wave
oscillator
bridge
amplitude
time-varying
nonlinear
