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Author: search.filters.author.Meng, ChinchunSubject: search.filters.subject.phase inverter

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Now showing 1 - 6 of 6
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    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.
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    Item type:Item,
    15 GHz Wideband CMOS Gilbert Up-Converter With Stacked Spiral-CPS Phase-Inverter Rat-Race Coupler at RF Port
    (2013)
    Hsiao, Yu-Chih
    ;
    Meng, Chinchun
    ;
    Wu, Po-Yi
    ;
    Huang, Guo-wei
    ;
    電機資訊學士班
    A miniaturized phase-inverter rat-race and its wideband Gilbert up-converter is demonstrated in 0.13-mu m CMOS technology. The common-mode LO leakage can be absorbed by the isolated port of the rat-race coupler while the rate-race employed at RF port to combine the mixer differential output. A phase-inverter rat-race coupler with a stacked spiral-shape coplanar stripline (CPS) by multi-layer metals can highly reduce the chip size. Finally, the experimental results of up-converter shows the 1-dB conversion gain and 15 GHz RF bandwidth. The IF-to-RF isolation is about 50 dB and LO-to-RF isolation is about 23 dB, respectively.
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    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.
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    Item type:Item,
    Gilbert Mixers With Microwave Quadrature/Differential Generators: An Approach for Millimeter-Wave IC
    (2009)
    Meng, Chinchun
    ;
    Tseng, Sheng-Che
    ;
    電信工程研究所
    ;
    Institute of Communications Engineering
    Several microwave passive components can be integrated with active circuits in standard silicon processes for millimeter-wave applications. Passive components such as Marchand baluns, quadrature couplers, and rat-race hybrids are directly implemented on a standard low-resistivity (similar to 10 Omega xcm) silicon substrate for size compactness because of the high dielectric constant. New circuit design concepts such as balanced path loss and distortionless transmission lines are applied to tolerate the unavoidable loss and to maintain the functionality of components.
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    Item type:Item,
    A silicon monolithic phase-inverter rat-race coupler using spiral coplanar striplines and its application in a broadband Gilbert mixer
    (2008-08-01)
    Tseng, Sheng-Che
    ;
    Meng, Chinchun
    ;
    Chang, Chia-Hung
    ;
    Chang, Shih-Hsien
    ;
    Huang, Guo-Wei
    This paper realized a broadband uniplanar phase-inverter rat-race coupler using a standard silicon process, and then analyzed this coupler under a lossy condition. A phase inverter is employed in this coupler, not only to extend the operation bandwidth, but also to generate balanced outputs by providing equal lossy paths, while symmetrical spiral-shaped coplanar striplines (CPSs) are also utilized to shrink the coupler size, as well as to construct a phase inverter in the middle of one of spiral CPSs. The lossy CPS, when designed as a distortionless line, has a real characteristic impedance, and thus, perfect port matching of the coupler can be achieved at the center frequency. The operation frequency of this silicon monolithic rat-race coupler with the size of 0.5 mm(2) is extremely wide and ranges from 5 to 23 GHz. The dissipated loss, transmission coefficient, and isolation of the rat-race coupler are approximately 5.5, -8, and below -25 dB, respectively. In addition, a wideband Gilbert micromixer with an integrated uniplanar phase-inverter rat-race coupler at the local oscillator port is demonstrated using 0.35-mu m SiGe BiCMOS technology. This mixer works from 2.5 to 13 GHz with 12-dB conversion gain, -16-dBm IP(1) (dB), -4-dBm IIP(3), and 14-dB noise figure. The chip size of the mixer with an integrated coupler is approximately 1.4 mm x 1.4 mm.