Phaselock Loop Cycle Slipping Caused by Excessive Angle Modulation

The occurrence of cycle slipping in a Phaselock Loop (PLL) FM Demodulator is discussed. Single spikes occur in a first order loop as the modulation limit is exceeded with sinusoidal modulation. A second order loop, however, experiences complete break-up, commonly referred to as bursting, of the demodulated output when the modulation limit is exceeded. An explanation is provided for the phenomenon and the result is generalized to an -th Order PLL.