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    Please use this identifier to cite or link to this item: http://tkuir.lib.tku.edu.tw:8080/dspace/handle/987654321/92974


    Title: A Robust Oscillator for Embedded System without External Crystal
    Authors: Yang, Wei-Bin;Wang, Chi-Hsiung;Chou, I-Ting
    Contributors: 淡江大學電機工程學系
    Keywords: Constant current reference;Voltage-Controlled Oscillator;Ring Oscillator
    Date: 2012
    Issue Date: 2013-10-30 14:26:42 (UTC+8)
    Publisher: Montgomery: Dixie W Publishing Corporation
    Abstract: The robust voltage-oscillator is presented by using the constant current reference and the ring oscillator for the embedded system application.The constant current reference generates the constant current for the succeeding ring oscillator to produce a stable 4MHz oscillation frequency.The proposed VOC circuit was fabricated in a 0.35 um CMOS technology and worked with a supply voltage of 3.3V.The chip area of the VCO was 150 um x 130 um.According to measured results, the oscillator frequency drift of proposed VCO was 986 ppm/℃ over a temperature range of -25℃ to 100℃.The phase noise of -62.29 dBc/Hz was obtained at 1MHz offset from the carrier.Moreover, total current consumption of the entire VOC was 234.72 uA. Therefore, the proposed VCO is suitable for integration into the embedded system.
    Relation: Applied Mathematics & Information Sciences
    Appears in Collections:[Graduate Institute & Department of Electrical Engineering] Journal Article

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