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Investigation of Different Input-Matching Mechanisms Used in Wide-Band LNA Design

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Abstract

This paper analyzes different input-matching mechanisms used in designing the wide-band amplifiers in general, and the low noise amplifiers (LNA) in particular, and their corresponding noise impact. Among them, the most promising one is the reactive-feedback circuit configuration, which is a combination of high-frequency inductive feedback and low frequency capacitive feedback. In this paper the simulated result that both matched input impedance and low noise temperature T n can be achieved simultaneously over a wide bandwidth in the single-ended low noise amplifier is proved mathematically and is well interpreted. This understanding of reactive feedback is crucial for the future development of ultra-wide-band low-noise amplifiers.

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Authors and Affiliations

  1. Department of Electronics Engineering, National Chiao Tung University, Hsin-Chu, Taiwan Republic of China

    Robert Hu

  2. VIA Technologies, Taipei, Taiwan Republic of China

    Mark S. C. Yang

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  1. Robert Hu
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  2. Mark S. C. Yang
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Hu, R., Yang, M. Investigation of Different Input-Matching Mechanisms Used in Wide-Band LNA Design. Int J Infrared Milli Waves 26, 221–245 (2005). https://doi.org/10.1007/s10762-005-3002-4

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  • DOI: https://doi.org/10.1007/s10762-005-3002-4

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