Due to the noises in the transmission channel of communication system and the vibration of equipment, the phase and frequency of the signal received by the receiver differs from that of the original signal. It is important to reduce those phase noise and frequency noise. This paper presents the structure of an improved discrete-time phase-locked loop (PLL) with loop delay to reduce both phase and frequency noise. A detailed theoretical analysis of this PLL is presented. The analysis emphasizes the phase noise performance. The main results are comparisons with three other kinds of PLLs in the area of performance of reducing phase and frequency noise. Simulation results are illustrated via graphics and tables.
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