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Author: search.filters.author.Wei, Hung-JuSubject: search.filters.subject.SiGe HBT

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Now showing 1 - 3 of 3
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    True 50% Duty-Cycle High-Speed Divider with the Modulus of Odd Numbers
    (2009)
    Tseng, Sheng-Che
    ;
    Wei, Hung-Ju
    ;
    Syu, Jin-Siang
    ;
    Meng, Chinchun
    ;
    Tsung, Kuan-Chang
    This paper proposes a true 50% duty-cycle highspeed prescaler with an odd modulus, based on current switchable D flip-flops. Each D flip-flop can sample data at the positive and negative clock edges, because of the changeable trigger mode. The proposed divide-by-N prescaler, with a 50% duty cycle, is formed as a ring with an N number of D flip-flops. Two types of 50% duty-cycle divide-by-five prescalers, the sample-hold-sample-hold-hold (SHSHH) prescaler and the sample-sample-hold-sample-hold (SSHSH) prescaler, are implemented using the 0.35 mu m SiGe HBT technology. The SHSHH divider has a better performance, up to 7 GHz, thanks to the synchronization of data and control signals.
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    A High-Speed HBT Prescaler Based on the Divide-by-Two Topology
    (2007)
    Wei, Hung-Ju
    ;
    Meng, Chinchun
    ;
    Chang, Yuwen
    ;
    Lin, Yi-Chen
    ;
    Huang, Guo-Wei
    This paper demonstrates the Divide-by4/5 prescalers with merged AND gates in 2 mu m GaInP/GaAs heterojunction bipolar transistor (HBT) and 035 mu m SiGe HBT technologies. By biasing the HBT near the peak transit-time frequency (f(tau)), the maximum operating frequency of a D-type flip-flop (D-FF) can be promoted. At the supply voltage of 5 V, the GaInP/GaAs prescaler operates from 30 MHz to 5.2 GHz, and the SiGe prescaler has the higher-speed performance of 1 GHz similar to 8 GHz at the cost of power consumption.
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    KU-BAND SiGe HBT I/Q SUBHARMONIC MIXER WITH REACTIVE QUADRATURE GENERATORS
    (2010-07-01)
    Tseng, Sheng-Che
    ;
    Syu, Jin-Siang
    ;
    Su, Jen-Yi
    ;
    Wei, Hung-Ju
    ;
    Meng, Chinchun
    This article demonstrates a high-frequency 0.35-mu m SiGe HBT subharmonic downconverter with reactive in-phase and quadrature-phase (I/Q) generators. Two reactive I/Q generators are integrated in our work to provide differential quadrature RF and LO signal. The I/Q subharmonic downconverter with single-ended LO. RF. and IF (I/Q) ports has a conversion gain of 1 a. IP(1dB) of -10 dBm. IIP(3) of 0 dBm, and IIP(2) of 21 dBm at 16.4 GHz. The magnitude and phase errors between the I and Q channels are 1.34% and 0.6 degrees. respectively. The dc power consumption of this IIQ mixer without output buffers is approximately 5 mW. (C) 2010 Wiley Periodicals, Inc. Microwave Opt Technol Lett 52: 1516-1520, 2010; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.25281