The response of an automatic phase control system to FM signals and noise

An Automatic Phase Control (APC) System is analyzed in order to determine its response to frequency modulated signals, and narrow-band Gaussian noise. Emphasis is placed on the system\´s response to signals having "ramp" type FM. The response of the APC System to an FM signal is obtained using a perturbation and a piecewise linear technique. The response of the system to noise is obtained using an iteration technique. The complete response to an FM signal and noise is then discussed using an iteration technique and extending the results previously obtained.