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Power-efficient ultra wideband LNAs for the world’s largest radio telescope

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Abstract

This paper reports two Low Noise Amplifiers (LNA) for Aperture Array system of the international Square Kilometre Array (SKA) project. LNA design for SKA is a step change in traditional LNA design approach for radio astronomy applications as the defining aspects of performance are low noise along with low power consumption and adequate gain. The LNAs are designed, fabricated and characterised for frequency range of 20 −1000 MHz. One LNA has single ended input to single ended output configuration (LNA1) while the other LNA has balanced input to single ended output (LNA2). The S-parameter, noise figure (NF) and large signal response of the LNAs are measured at room temperature. Both LNAs show flat gain of higher than 30 dB over specified frequency range. Average NF values of LNA1 and LNA2 are 0.55 dB and 0.75 dB respectively. Mixed mode S-parameter response based on theoretical analysis of differential configuration is presented. The LNAs have exceptionally low power consumption of less than 25 mW; 20 times lower than the other reported LNAs available for the SKA and also covering complete frequency band with less than 1 dB NF. Therefore implication of these LNAs is a significant step forward as the projected number of LNAs required for the lower frequency band of SKA Aperture Array system is 5,600,000 (Dewdney et al., Proc. IEEE 97(8), 1482–1496, 2009; Faulkner et al. 2010).

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Acknowledgements

The authors acknowledge Preparatory Square Kilometre Array (PrepSKA) program for help with funding and Mr. Neil Roddis for his continuous support throughout this work.

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  1. The University of Manchester, Oxford Road, Manchester, M139PL, UK

    M. Panahi, S. Bhaumik & D. George

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  1. M. Panahi
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Correspondence to M. Panahi.

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Panahi, M., Bhaumik, S. & George, D. Power-efficient ultra wideband LNAs for the world’s largest radio telescope. Exp Astron 38, 359–379 (2014). https://doi.org/10.1007/s10686-014-9399-9

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