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Flat-High-Gain Design and Noise Optimization in SiGe Low-Noise Amplifier for S–K Band Applications

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Abstract

This paper presents an ultra-wideband (UWB) low-noise amplifier (LNA) with extremely flat-high-gain and low-noise figure (NF). In traditional resistive feedback topology, input matching, gain, and NF cannot be balanced. For better performance trade-offs in UWB design, a novel emitter-follower resistive feedback (EFRFB) is introduced, which utilizes a common-collector amplifier followed by a feedback resistor to flatten the gain (the ripple reduced by 2.3 dB) while alleviating the constraints between the gain and input matching. The enhanced gain without restraint by S11 is exactly required for noise reduction technology. Moreover, a peaking inductor and two resistors are adopted to improve bandwidth and output matching, respectively. The proposed LNA is implemented in a 0.18-μm SiGe BiCMOS technology and occupies 0.15 mm2 without pads. Measurements demonstrate that the LNA has a gain of 19.5 dB with ripple < 0.6 dB, a minimum NF of 2.8 dB from 2 to 22 GHz, and an input third-order intercept point (IIP3) of–7.6 dBm at 10 GHz while drawing 10.9 mA from a 3.3 V supply.

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Acknowledgments

This work was supported by the Natural Science Basic Research Plan in Shaanxi province of China under Grant 2019JM-316, in part by the Innovation Fund of Xidian University.

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Authors and Affiliations

  1. School of Microelectronics, Xidian University, Xi’an, 710071, Shaanxi, China

    Zhenrong Li, Boyu Liu, Yiming Duan, Zeyuan Wang, Zhen Li & Yiqi Zhuang

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  1. Zhenrong Li
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  2. Boyu Liu
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Li, Z., Liu, B., Duan, Y. et al. Flat-High-Gain Design and Noise Optimization in SiGe Low-Noise Amplifier for S–K Band Applications. Circuits Syst Signal Process 40, 2720–2740 (2021). https://doi.org/10.1007/s00034-020-01616-2

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  • DOI: https://doi.org/10.1007/s00034-020-01616-2

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