Study of chaotic phenomena of phase-locked frequency detector
锁相鉴频器混沌现象的研究

This paper studies chaotic phenomena of phase-locked frequency detector that is used extensively in radio technology and modern communication fields. By Mel'nikov's method, phase-locked frequency detector will output chaotic signal when the system's parameter and the parameters of input signal satisfy certain conditions. By circuit experiment, when the circuit outputs chaotic signal, the continuous spectrum of the voltage-controlled oscillator's output is observed from frequency spectrograph. The fact of phase-locked frequency detector exists chaotic phenomena is father verified. The experimental results and theory analysis correspond excellently with one another. The conclusion in this paper has importance directive significance for practical design and application of the phase-locked frequency detector.