The Delta-Sigma Modulator of Fractional-N Frequency Synthesizer for Wireless Sensors Network Applications

The Delta-Sigma Modulator of Fractional-N Frequency Synthesizer for Wireless Sensors Network Applications

This paper presents a design of fractional-N frequency synthesizer with low dithering, which is fabricated in a 130nm CMOS process. A 3rd-order delta-sigma modulator is based on digital multi-stage noise shaping (MASH) structure with its second and third stage dithered by 7-bit linear feedback shift...

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Veröffentlicht in:Key engineering materials 2014-04, Vol.609-610, p.1014-1019
Hauptverfasser: Gao, Zhi Qiang, Liu, Xiao Wei, Lan, Jin Bao, Yin, Liang
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Sprache:eng
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CMOS
Dithering
Frequency synthesizers
Linear feedback shift registers
Modulators
Remote sensors
Simulation
Wireless networks
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Liu, Xiao Wei
Lan, Jin Bao
Yin, Liang
description This paper presents a design of fractional-N frequency synthesizer with low dithering, which is fabricated in a 130nm CMOS process. A 3rd-order delta-sigma modulator is based on digital multi-stage noise shaping (MASH) structure with its second and third stage dithered by 7-bit linear feedback shift register (LFSR) was designed for the frequency synthesizer, and a long word is used for the first modulator in the MASH structure. The simulation result of the whole frequency synthesizer shows that it can output two-way I/Q signal between 2.28GHz and 2.53GHz, and its spurs are lower than-75dBc.
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subjects CMOS
Dithering
Frequency synthesizers
Linear feedback shift registers
Modulators
Remote sensors
Simulation
Wireless networks
title The Delta-Sigma Modulator of Fractional-N Frequency Synthesizer for Wireless Sensors Network Applications
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