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🏛️國立陽明交通大學機構典藏

Author: search.filters.author.Syu, Jin-SiangSubject: search.filters.subject.image rejection

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Now showing 1 - 4 of 4
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    2.4/5.7-GHz Dual-Band Dual-Conversion Architecture With Correlated LO Signal Generators
    (2009)
    Syu, Jin-Siang
    ;
    Meng, Chinchun
    ;
    Yu, Sheng-Wen
    ;
    Wu, Tzung-Han
    ;
    Huang, Guo-Wei
    A 2.4/5.7-GHz dual-band dual-conversion downconverter is demonstrated using 0.35-mu m SiGe hetero-junction bipolar transistor (HBT) technology. This downconverter employs a complex dual-conversion system and a complex filter to reject the first and second image signals, respectively. The LO(1) frequency is 2.5 times the LO(2) frequency and is generated by a divide-by-two divider, a frequency doubler and a single-sideband up-converter. As a result, the correlated LO signals maintain excellent image-rejection performance of the dual-conversion system while only one LO input is needed. The downconverter achieves a 40/39-dB image-rejection ratio of the first image and a 44/46-dB image-rejection ratio of the second image for 2.4/5.7-GHz modes, respectively.
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    X-Band Weaver-Hartley Low-IF Downconverter With a Resonant LC Load
    (2009)
    Syu, Jin-Siang
    ;
    Meng, Chinchun
    ;
    Teng, Ya-Hui
    ;
    Huang, Guo-Wei
    ;
    電子工程學系及電子研究所
    An X-band Weaver-Hartley dual-conversion low-IF downconverter is demonstrated in this paper using 0.35-mu m SiGe heterojunction bipolar transistor (HUT) technology. The first image signal is shifted away from the IF band due to the complex Weaver architecture while the second image signal is eliminated by a polyphase filter in the following Hartley architecture. In this work, a resonant LC load is employed at the first-stage mixer to improve both gain and linearity. As a result, the demonstrated downconverter achieves a conversion gain of 8 dB, single-sideband noise figure of 18 dB, IP(1dB) of -9 dBm, and IIP(3) of 0 dBm, respectively, while consuming 75 mW at a 3.3-V supply. Moreover, the first and second image-rejection ratios are better than 43 and 40 dB when IF frequency ranges from 15 to 100 MHz.
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    2.4/5.7-GHz CMOS Dual-Band Low-IF Architecture Using Weaver-Hartley Image-Rejection Techniques
    (2009-03-01)
    Meng, Chin-Chun
    ;
    Wu, Tzung-Han
    ;
    Syu, Jin-Siang
    ;
    Yu, Sheng-Wen
    ;
    Tsung, Kuan-Chang
    A 2.4/5.7-GHz dual-band Weaver-Hartley architecture, using 0.18-mu m CMOS technology, is demonstrated in this paper. The 2.4-GHz signal is set to be the image signal when the desired signal is at 5.7 GHz, and vice versa. Since the Weaver and Hartley systems are combined into this architecture, the demonstrated architecture rejects not only the first image signal, but also the secondary image signal. The image-rejection ratios of the first image signal and the secondary image signal are better than 40 and 46 dB, respectively. In this paper, a diagrammatic explanation is employed to obtain the image-rejection mechanisms of the Weaver-Hartley architecture.
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    Large Improvement in Image Rejection of Double-Quadrature Dual-Conversion Low-IF Architectures
    (2010-07-01)
    Syu, Jin-Siang
    ;
    Meng, Chin-Chun
    ;
    Teng, Ya-Hui
    ;
    Liao, Hua-Yu
    ;
    電機工程學系
    The reasons for a degradation of image-rejection performance in double-quadrature-double-quadrature and single-quadrature-double-quadrature dual-conversion low-IF downconverters are fully discussed in this paper. Polyphase filters (PPFs) are inserted at proper positions to minimize the effects of device/signal mismatches, and thus improve the image rejection without calibration. Both a 0.35-mu m SiGe heterojunction bipolar transistor 5.2-GHz double-quadrature-double-quadrature downconverter with an RF PPF and a 0.18-mu m CMOS 2.2/4.8-GHz single-quadrature-double-quadrature downconverter with a switched-band low-noise amplifier (LNA) and a narrowband inter-stage PPF are demonstrated. Compared with our previous work, the 5.2-GHz downconverter achieves a 15-dB improvement in image-rejection ratio (IRR) of the first image signal (IRRR(1)) even without a pre-selection filter or LNA. Additionally, the dual-band downconverter has a 25-dB improvement in IRR of the second image signal (IRRR(2)), which nearly reaches the theoretical limit of a four-stage PPF covering 20-40 MHz.