可自适应调节带宽的新型非线性二阶锁相环

doi:10.16180/j.cnki.issn1007-7820.2019.01.001

Abstract

Abstract:

The large acquisition bandwidth presents a significant challenge to traditional second-order phase locked loops. On the basis of the contradiction of larger acquisition bandwidth and noise reduction capabilities, a novel second-order PLL which was coupled with a nonlinear element, was introduced in this paper. The loop noise bandwidth was adaptively adjusted by the nonlinear element. The frequency error was reduced more quickly with a larger bandwidth when the frequency error was large. By contrast, the noise was suppressed with a smaller bandwidth to improve the tracking accuracy when the frequency error was reduced due to the control effect of the loop. The simulation results indicated that the tracking speed of the proposed nonlinear second order PLL was significantly increased and the acquisition bandwidth was increased from 4 kHz to 18.8 kHz.

Key words: phase locked loop, acquisition bandwidth, tracking accuracy, adaptive, frequency-phase error, loop noise bandwidth

CLC Number:

TN92

ZHAO Lei,SHI Lei,ZHU Congying,YAO Bo. A Novel Second Order Phase Locked Loop with Adaptive Adjusted Bandwidth[J].Electronic Science and Technology, 2019, 32(1): 1-4.

Figures/Tables 7

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References 17

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A Novel Second Order Phase Locked Loop with Adaptive Adjusted Bandwidth

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