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Open Engineering

formerly Central European Journal of Engineering

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Online
ISSN
2391-5439
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A power efficient bandwidth regulation technique for a low-noise high-gain RF wideband amplifier

1Department of Electrical and Electronic Engineering, Bangladesh Univ. of Engineering and Technology (BUET), Dhaka, 1000, Bangladesh

© 2012 Versita Warsaw. This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License. (CC BY-NC-ND 3.0)

Citation Information: Open Engineering. Volume 2, Issue 3, Pages 383–391, ISSN (Online) 2391-5439, DOI: 10.2478/s13531-012-0009-1, July 2012

Publication History

Published Online:
2012-07-01

Abstract

In this paper, a single-stage deep sub-micron wideband amplifier (LNA) using a reactive resonance tank and passive port-matching techniques is demonstrated operating in the microwave frequency range (K band). A novel power-efficient bandwidth (BW) regulation technique is proposed by incorporating a small impedance in the resonance tank of the amplifier configuration. It manifests a forward gain in the range of 5.9–10.7 dB covering a message bandwidth of 10.6–6.3 GHz. With regulation, input-output reflection parameters (S 11, S 22) and noise figure can be manipulated by −12.7 dB, −22.7 dB and 0.36 dB, respectively. Symmetric regulation is achieved for bandwidth and small signal gain with respect to moderate tank impedance (36.5% and −26.8%, respectively) but the effect on noise contribution remains relatively low (increase of 7% from a base value of 2.39 dB). The regulated architecture, when analyzed with 90 nm silicon CMOS process, supports low power (9.1 mW) on-chip communication. The circuit is tested with a number of combinations for tank (drain) impedance to verify the efficiency of the proposed technique and achieves better figures of merit when compared with published literature.

Keywords: Bandwidth regulation; Wideband amplifier; High gain; 90 nm

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