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Digital High Order Multiplier-free Delta Sigma Modulator for Multistandard Fractional-N Frequency Synthesizer

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Author(s): Manel Ben-Romdhane | Aymen Abeda | Chiheb Rebai

Journal: Journal of Computers
ISSN 1796-203X

Volume: 5;
Issue: 10;
Start page: 1494;
Date: 2010;
Original page

Keywords: Multistandard frequency synthesis | Fractional-N PLL | Digital delta sigma modulator

ABSTRACT
This paper proposes a new stable design strategy for 1-bit high order digital DS modulator for multistandard fractional-N frequency synthesizer. The proposed digital DS modulator presents simplicity, low power consumption and controls a dual-modulus divider instead of multi-modulus one as in existing DS fractional-N frequency synthesizer. Simulation results illustrate the DS modulator good performances in terms of spectrum purity and accuracy. Using this stable 1-bit digital DS modulator output to a fractional-N frequency synthesizer Simulink model verifies the multistandard frequency synthesizer specifications.

Tango Jona
Tangokurs Rapperswil-Jona

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