Design and simulation of Fractional-N PLL frequency synthesizers

Author

Kozak, Mücahit ; Friedman, Eby G.

Author_Institution

Dept. of Electr. & Comput. Eng., Rochester Univ., NY, USA

Volume

4

fYear

2004

fDate

23-26 May 2004

Abstract

A fast simulation environment has been developed using MATLABM™ and CMEX™ for behavioral level simulation of Delta-Sigma (ΔΣ) based Fractional-N PLL frequency synthesizers. The simulator uses a differential equation approach with a uniform time step. To support a uniform time step in the simulation, the continuous-time average current-to-voltage loop filter transfer function is modeled as a discrete-time charge difference-to-voltage transfer function. Simulation results are presented on a type-II fourth-order PLL frequency synthesizer employing a third-order MASH ΔΣ modulator.

Keywords

delta-sigma modulation; frequency synthesizers; passive filters; phase locked loops; CMEX™; MASH delta-sigma modulator; MATLABM™; PLL frequency synthesizers; current-voltage loop filter transfer function; discrete-time charge difference; fractional-N PLL frequency synthesizers; time step; voltage transfer function; Computational modeling; Computer languages; Computer simulation; Contracts; Filters; Frequency synthesizers; Mathematical model; Phase locked loops; Phase noise; Transfer functions;

fLanguage

English

Publisher

ieee

Conference_Titel

Circuits and Systems, 2004. ISCAS '04. Proceedings of the 2004 International Symposium on

Print_ISBN

0-7803-8251-X

Type

conf

DOI

10.1109/ISCAS.2004.1329120

Filename

1329120