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Proceedings Paper

SNDR enhancement in noisy sinusoidal signals by non-linear processing elements
Author(s): Ferran Martorell; Mark D. McDonnell; Derek Abbott; Antonio Rubio
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Paper Abstract

We investigate the possibility of building linear amplifiers capable of enhancing the Signal-to-Noise and Distortion Ratio (SNDR) of sinusoidal input signals using simple non-linear elements. Other works have proven that it is possible to enhance the Signal-to-Noise Ratio (SNR) by using limiters. In this work we study a soft limiter non-linear element with and without hysteresis. We show that the SNDR of sinusoidal signals can be enhanced by 0.94 dB using a wideband soft limiter and up to 9.68 dB using a wideband soft limiter with hysteresis. These results indicate that linear amplifiers could be constructed using non-linear circuits with hysteresis. This paper presents mathematical descriptions for the non-linear elements using statistical parameters. Using these models, the input-output SNDR enhancement is obtained by optimizing the non-linear transfer function parameters to maximize the output SNDR.

Paper Details

Date Published: 11 June 2007
PDF: 10 pages
Proc. SPIE 6600, Noise and Fluctuations in Circuits, Devices, and Materials, 660011 (11 June 2007); doi: 10.1117/12.724688
Show Author Affiliations
Ferran Martorell, Univ. Politècnica de Catalunya (Spain)
Mark D. McDonnell, The Univ. of Adelaide (Australia)
Derek Abbott, The Univ. of Adelaide (Australia)
Antonio Rubio, Univ. Politècnica de Catalunya (Spain)

Published in SPIE Proceedings Vol. 6600:
Noise and Fluctuations in Circuits, Devices, and Materials
Massimo Macucci; Lode K.J. Vandamme; Carmine Ciofi; Michael B. Weissman, Editor(s)

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