A Passive Third-Order Cascade PLL Filter

Abstract:

In this paper, the traditional passive loop filter is improved, and a new type of Cascade Third-order filter structure and Graphical Phase Design method is proposed, which greatly simplifies high-order PLL filter’s design, analysis and calculation. According to graphical phase design principle, parameters for cascade third-order filter could be figured out from the given formula, the derived result is simulated in the form of Bode plots and Unit-step response with Pspice software and the loop target under different parameters is compared. Experiments show that this third-order filter could significantly improve the stability of PLL, deeply attenuate the phase detector’s high-frequency noise and is well adapted to the loop gain change. Users can also change the design parameters flexibly according to the system requirements with this filter.

• Periodical: Advanced Materials Research (Volumes 255-260)
• Pages: 2262-2266
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.255-260.2262
• Online since: May 2011
• Authors: Lin Feng, Chu Wu, Bo Jin, Zhen Yu Wu
• Keywords: Bode Plots, Design Parameter, Phase Locked Loop (PLL), PSpice, Three-Order Cascade PLL Filter, Unit-Step Response

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