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Journal of RF-Engineering and Telecommunications

Editor-in-Chief: Jakoby, Rolf

12 Issues per year

IMPACT FACTOR 2016: 0.462

CiteScore 2016: 0.43

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Source Normalized Impact per Paper (SNIP) 2016: 0.333

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Volume 65, Issue 1-2


A Fast-Locking Frequency Synthesizer for the Single-Chip CMOS UHF RFID Reader

Chunhua Wang / Guanchao Peng / Jingru Sun / Qiuzhen Wan / Qiujing Zhang
Published Online: 2011-04-11 | DOI: https://doi.org/10.1515/freq.2011.004


A fast-locking frequency synthesizer is designed for single-chip UHF RFID Reader. Different from the traditional UHF RFID frequency synthesizer, the technology of multi-modulus divider (MMD) is adopted here, which greatly reduces the design complexity. More importantly, two inverters and one toggle circuit are added to the output of the multi-modulus divider to improve the output load driving capability and the operation speed of the phase frequency detector (PFD), so as to reduce the locking time of the frequency synthesizer. Finally an improved divider by 2 is used at the output stage of the frequency, and the performance of the output waveform is improved. The simulation is made by Cadence in chartered 0.18 μm CMOS process. The simulation result shows that the output waveform is very good and the locking time is less than 10 μs. The phase noise of the output signal are approximately –104.8 dBc/Hz at 200 KHz and –124.6 dBc/Hz at 1MHz offset from 900MHz operating frequency, which is suitable for UHF RFID Reader. The frequency synthesizer dissipates 28.2mW with a 1.8V supply voltage.

Keywords.: Fast-Locking; Duty Cycle; Frequency Synthesizer; Multi-Modulus; Programmable Divider; CMOS; UHF

About the article

Corresponding author: Chunhua Wang, School of Computer and Communication, Hunan University, Changsha, 410082 Hunan, P. R. China

Received: 2010-11-15

Published Online: 2011-04-11

Published in Print: 2011-03-01

Citation Information: Frequenz, Volume 65, Issue 1-2, Pages 21–28, ISSN (Online) 2191-6349, ISSN (Print) 0016-1136, DOI: https://doi.org/10.1515/freq.2011.004.

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