A NOVEL COMPENSATION METHOD FOR IMPROVING ERROR AND SETTLING TIME OF A 3 rd ORDER PHASE-LOCKED LOOP FOR COMMUNICATION SYSTEM

To enhance the performance and to minimize the limited bandwidth error occurred in phase - locked loop, we proposed a method for modelling and behavioural simulation of a 3rd order phase - locked loop by considering two 2nd order active filter topologies, namely: (i) ideal multiple feedback approach, and (ii) filter with compensated multiple feedback approach in the loop. The s – domain transfer functions are simulated by using MATLAB to study the stability and different design aspects of the system. In ideal multiple feedback approach, the operational amplifier produces errors into the magnitude and phase responses of the filter because of limited gain bandwidth. To overcome this problem, we have proposed a filter with compensated multiple feedback approach in the loop