Journal of South China University of Technology(Natural Science) >

2011 , Vol. 39 >Issue 2: 7 - 11

DOI: https://doi.org/10.3969/j.issn.1000-565X.2011.02.002

Electronics, Communication & Automation Technology

Design of Digitally-Controlled Crystal Oscillator for GSM/EDGE Radio-Frequency Integrated Chip

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  • 1. Beijing university shenzhen graduate school integration Microsystems key laboratory, shenzhen, guangdong 518055; 2. Zte stock Co., LTD xian r&d center, xian in shaanxi 710065
陈勖(1977一)，男，讲师，博士，主要从事RFIC研究

Received date: 2010-04-21

  Revised date: 2010-08-09

  Online published: 2011-01-02

Supported by

国家“863”计划项目(2006AA04A112)；深圳市产学研资助项目(SZKJ-2008005)

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Abstract

By analyzing the quartz crystal oscillator with the equivalent small-signal model,a digitally-controlled crystal oscillator（DCXO） for GSM/EDGE RF transceiver chips is designed and implemented.DCXO,in Colpitts structure,uses the automatic-gain negative feedback to control the circuit amplitude and adopts a digitally-controlled capacitor array to adjust the stability of transient frequency.The whole circuit is implemented via the TSMC 0.18μm CMOS technology,with a center frequency of 26MHz.Simulated results in the case of 1.8V power supply show that（1） DCXO is of a digitally-controlled range of 123×10-6@26MHz,a regulation accuracy of 0.0075×10-6 per step,a startup time of about 1.5ms and an oscillation peak of about 1.2V;（2） the phase noises respectively reach-145.800dBc/Hz at 1kHz and-153.032dBc/Hz at 10kHz offset;and（3） the total power consumption of DCXO is only 3 mW.

Key words： digitally-controlled crystal oscillator; phase noise; automatic frequency control

Cite this article

Chen Xu Chen Xiao-qiang Xu Feng Wang Xin-an . Design of Digitally-Controlled Crystal Oscillator for GSM/EDGE Radio-Frequency Integrated Chip[J]. Journal of South China University of Technology(Natural Science), 2011 , 39(2) : 7 -11 . DOI: 10.3969/j.issn.1000-565X.2011.02.002

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