用非线性理论阐述正弦反馈振荡器的频率和幅度稳定度

NONLINEAR THEORIES OF FREQUENCY AND AMPLITUDE STABILITY IN SINUSOIDAL FEEDBACK OSCILLATORS

首先,本文对用于近似正弦反馈振荡器频率稳定度分析的线性理论作了简要的回顾然后应用描述函数法和判决方程法导出了非线性近似正弦反馈振荡器的振荡频率和振荡幅度稳定度的新的表达式。最后对导致用描述函数法和判决方程法导出的振荡频率稳定度不同的内在原因进行了详细的论述。

First, the linear theories of frequency stability in nearly sinusoidal feedback oseil-lators are simply reviewed. Then, the describing function method and determining equation approach are applied to obtain new expressions for the oscillation-frequency and the oscillation-amplitude stability of nonlinear nearly sinusoidal feedback oscillators. Finally, the differences of the expressions of oscillation-frequency stability derived from describing function method and determining equation approach are presented, and the relationship between describing function method and determining equation approach is studied.