Indexed by:会议论文

Date of Publication:2011-07-29

Included Journals:EI、CPCI-S、Scopus

Volume:255-260

Page Number:2262-2266

Key Words:PLL; Three-order cascade PLL filter; Design parameter; Pspice; Bode plots; Unit-step response

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.