A zero-order phase-locked loop control algorithm

A method of minimizing dynamics and reducing phase error towards zero for arbitrary input frequency/phase change while maintaining stability in phase-locked loops is presented. The system transfer function becomes theoretically of zero order and the error is zero. Practically, the steady state phase error is zero and the system is of minimum dynamics/order. The method synthesizes a feedforward control that is added to the standard phase-locked loop. The feedforward, effected from the system input to a summing junction, comprises on inverse feedforward control principle relative to the part of the feedback loop seen after the summing junction