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Design and simulation of Fractional-N PLL frequency synthesizers

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2 Author(s)
Kozak, M. ; Dept. of Electr. & Comput. Eng., Rochester Univ., NY, USA ; Friedman, E.G.

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.

Published in:

Circuits and Systems, 2004. ISCAS '04. Proceedings of the 2004 International Symposium on  (Volume:4 )

Date of Conference:

23-26 May 2004