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  • Liu, Bo  (3)
  • Xu, Panpan  (3)
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  • 1
    Online Resource
    Online Resource
    Emerald ; 2020
    In:  Circuit World Vol. 46, No. 4 ( 2020-04-02), p. 243-248
    In: Circuit World, Emerald, Vol. 46, No. 4 ( 2020-04-02), p. 243-248
    Abstract: Power amplifiers (PAs) play an important role in wireless communications because they dominate system performance. High-linearity broadband PAs are of great value for potential use in multi-band system implementation. The purpose of this paper is to present a cascode power amplifier architecture to achieve high power and high efficiency requirements for 4.2∼5.4 GHz applications. Design/methodology/approach A common emitter (CE) configuration with a stacked common base configuration of heterojunction bipolar transistor (HBT) is used to achieve high power. T -type matching network is used as input matching network. To increase the bandwidth, the output matching networks are implemented using the two L -networks. Findings By using the proposed method, the stacked PA demonstrates a maximum saturated output power of 26.2 dBm, a compact chip size of 1.17 × 0.59 mm 2 and a maximum power-added efficiency of 46.3 per cent. The PA shows a wideband small signal gain with less than 3 dB variation over working frequency. The saturated output power of the proposed PA is higher than 25 dBm between 4.2 and 5.4 GHz. Originality/value The technology adopted for the design of the 4.2-to-5.4 GHz stacked PA is the 2- µ m gallium arsenide HBT process. Based on the proposed method, a better power performance of 3 dB improvement can be achieved as compared with the conventional CE or common-source amplifier because of high output stacking impedance.
    Type of Medium: Online Resource
    ISSN: 0305-6120 , 0305-6120
    Language: English
    Publisher: Emerald
    Publication Date: 2020
    detail.hit.zdb_id: 2027537-7
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  • 2
    Online Resource
    Online Resource
    IOP Publishing ; 2019
    In:  Materials Research Express Vol. 6, No. 4 ( 2019-01-11), p. 045504-
    In: Materials Research Express, IOP Publishing, Vol. 6, No. 4 ( 2019-01-11), p. 045504-
    Type of Medium: Online Resource
    ISSN: 2053-1591
    Language: Unknown
    Publisher: IOP Publishing
    Publication Date: 2019
    detail.hit.zdb_id: 2760382-9
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  • 3
    Online Resource
    Online Resource
    Springer Science and Business Media LLC ; 2023
    In:  Scientific Data Vol. 10, No. 1 ( 2023-10-07)
    In: Scientific Data, Springer Science and Business Media LLC, Vol. 10, No. 1 ( 2023-10-07)
    Abstract: Zoonotic spillover of sarbecoviruses (SarbeCoVs) from non-human animals to humans under natural conditions has led to two large-scale pandemics, the severe acute respiratory syndrome (SARS) pandemic in 2003 and the ongoing COVID-19 pandemic. Knowledge of the genetic diversity, geographical distribution, and host specificity of SarbeCoVs is therefore of interest for pandemic surveillance and origin tracing of SARS-CoV and SARS-CoV-2. This study presents a comprehensive repository of publicly available animal-associated SarbeCoVs, covering 1,535 viruses identified from 63 animal species distributed in 43 countries worldwide (as of February 14,2023). Relevant meta-information, such as host species, sampling time and location, was manually curated and included in the dataset to facilitate further research on the potential patterns of viral diversity and ecological characteristics. In addition, the dataset also provides well-annotated sequence sets of receptor-binding domains (RBDs) and receptor-binding motifs (RBMs) for the scientific community to highlight the potential determinants of successful cross-species transmission that could be aid in risk estimation and strategic design for future emerging infectious disease control and prevention.
    Type of Medium: Online Resource
    ISSN: 2052-4463
    Language: English
    Publisher: Springer Science and Business Media LLC
    Publication Date: 2023
    detail.hit.zdb_id: 2775191-0
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