1. New Nonlinear Second-Order Phase-Locked Loop with Adaptive Bandwidth Regulation
- Author
-
Lei Zhao, Congying Zhu, and Lei Shi
- Subjects
Computer Networks and Communications ,Computer science ,lcsh:TK7800-8360 ,02 engineering and technology ,Synchronization ,Control theory ,0202 electrical engineering, electronic engineering, information engineering ,Hardware_INTEGRATEDCIRCUITS ,Frequency offset ,Electrical and Electronic Engineering ,020208 electrical & electronic engineering ,Bandwidth (signal processing) ,lcsh:Electronics ,Phase error ,adaptive ,020206 networking & telecommunications ,tracking accuracy ,Phase-locked loop ,Nonlinear system ,loop noise bandwidth ,Hardware and Architecture ,Control and Systems Engineering ,phase-locked loop ,Signal Processing ,Nonlinear element ,acquisition bandwidth - Abstract
Synchronization of large acquisition bandwidth brings great challenges to the traditional second-order phase-locked loop (PLL). To address the contradiction between acquisition bandwidth and noise suppression capability of the traditional PLL, a new second-order PLL coupled with a nonlinear element is proposed. The proposed nonlinear second-order PLL regulates the loop noise bandwidth adaptively by the nonlinear module. When a large input–output phase error occurs, this PLL reduces the frequency offset quickly by taking advantage of the large bandwidth. When the phase error is reduced by the loop control, the proposed PLL suppresses noises by using the small bandwidth to increase the tracking accuracy. Simulation results demonstrate that the tracking speed of the proposed PLL is increased considerably, and its acquisition bandwidth is increased to 18.8 kHz compared with that of the traditional second-order PLL (4 kHz).
- Published
- 2018