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Open AccessArticle

Design and Analysis of a Continuously Tunable Low Noise Amplifier for Software Defined Radio

Department of Electrical and Electronic Engineering, Auckland University of Technology, Auckland 1010, New Zealand
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Sensors 2019, 19(6), 1273; https://doi.org/10.3390/s19061273
Received: 22 January 2019 / Revised: 7 March 2019 / Accepted: 8 March 2019 / Published: 13 March 2019
(This article belongs to the Special Issue Advanced Technologies on Green Radio Networks)
This paper presents the design and analysis of a continuously tunable low noise amplifier (LNA) with an operating frequency from 2.2 GHz to 2.8 GHz. Continuous tuning is achieved through a radio frequency impedance transformer network in the input matching stage. The proposed circuit consists of four stages, namely transformer stage, tuning stage, phase shifter and gain stage. Frequency tuning is controlled by varying output current through bias voltage of tuning stage. The circuit includes an active phase shifter in the feedback path of amplifier to shift the phase of the amplified signal. Phase shift is required to further achieve tunability through transformer. The LNA achieves a maximum simulated gain of 18 dB. The LNA attains a perfect impedance match across the tuning range with stable operation. In addition, it achieves a minimum noise figure of 1.4 dB. View Full-Text
Keywords: green radio; software defined radio; low noise amplifier; transformer network; tuning transistor; phase shifter green radio; software defined radio; low noise amplifier; transformer network; tuning transistor; phase shifter
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Aneja, A.; Li, X.J. Design and Analysis of a Continuously Tunable Low Noise Amplifier for Software Defined Radio. Sensors 2019, 19, 1273.

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