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🏛️國立陽明交通大學機構典藏

Author: search.filters.author.Wei, Hung-JuSubject: search.filters.subject.step impedance

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Now showing 1 - 3 of 3
  • Thumbnail Image
    Item type:Item,
    A Chebyshev-Response Step-Impedance Phase-Inverter Rat-Race Coupler Directly on Lossy Silicon Substrate and Its Gilbert Mixer Application
    (2011-04)
    Wei, Hung-Ju
    ;
    Meng, Chinchun
    ;
    Yu, Sheng-Wen
    ;
    Chang, Chia-Hung
    ;
    電機工程學系
    This paper focuses on the analysis and the design methodology of the step-impedance phase-inverter rat-race coupler on a silicon-based process. The issues of impedance limitation and bandwidth are discussed in detail. Our proposed concept utilizes a high silicon dielectric constant, phase-inverter structure, step-impedance technique, and Chebyshev response to make the rat-race coupler more compact (similar to 64 reduction) and highly balanced over a wide operating bandwidth. Moreover, the inter-digital coplanar stripline used in the step-impedance section effectively reduces the characteristic impedance of the transmission line for large size shrinkage and insertion-loss reduction. The demonstrated step-impedance rat-race coupler directly on silicon substrate has 6- similar to 7-dB insertion loss from 5 to 15 GHz and small variations in amplitude/phase balance. Compared with our previous work, the proposed rat-race coupler achieves a 3-dB improvement in the insertion loss. Thus, a 0.13-mu m CMOS Gilbert down-converter with a miniature phase-inverter rat-race coupler at the RF path for wideband single-to-differential signal conversion achieves a noise figure of 16 dB.
  • Thumbnail Image
    Item type:Item,
    A Chebyshev-Response Step-Impedance Phase-Inverter Rat-Race Coupler Directly on Lossy Silicon Substrate and Its Gilbert Mixer Application
    (2011-04)
    Wei, Hung-Ju
    ;
    Meng, Chinchun
    ;
    Yu, Sheng-Wen
    ;
    Chang, Chia-Hung
    ;
    電機工程學系
    This paper focuses on the analysis and the design methodology of the step-impedance phase-inverter rat-race coupler on a silicon-based process. The issues of impedance limitation and bandwidth are discussed in detail. Our proposed concept utilizes a high silicon dielectric constant, phase-inverter structure, step-impedance technique, and Chebyshev response to make the rat-race coupler more compact (similar to 64 reduction) and highly balanced over a wide operating bandwidth. Moreover, the inter-digital coplanar stripline used in the step-impedance section effectively reduces the characteristic impedance of the transmission line for large size shrinkage and insertion-loss reduction. The demonstrated step-impedance rat-race coupler directly on silicon substrate has 6- similar to 7-dB insertion loss from 5 to 15 GHz and small variations in amplitude/phase balance. Compared with our previous work, the proposed rat-race coupler achieves a 3-dB improvement in the insertion loss. Thus, a 0.13-mu m CMOS Gilbert down-converter with a miniature phase-inverter rat-race coupler at the RF path for wideband single-to-differential signal conversion achieves a noise figure of 16 dB.
  • Thumbnail Image
    Item type:Item,
    Broadband CMOS Gilbert Down-Converter Utilizing a Low-Loss Step-Impedance Rat-Race Coupler
    (2009)
    Wei, Hung-Ju
    ;
    Meng, Chinchun
    ;
    Yu, Sheng-Wen
    ;
    電信工程研究所
    ;
    Institute of Communications Engineering
    A Broadband Gilbert Down-Converter with step-impedance rat-race coupler is demonstrated using 0.13 mu m standard CMOS technology. The proposed method utilizes higher effective dielectric-constant, phase-inverter and step-impedance techniques simultaneously to make the rat-race coupler more compact (similar to 64% reduction) and phase-balanced over a wide operating bandwidth. The down-converter has NF of 16 dB and LO-to-RF isolation of better than 35 dB. The mixer core consumes 2.9 mA at V(dd)=1.8 V.