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11 June 2007 SNDR enhancement in noisy sinusoidal signals by non-linear processing elements
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Proceedings Volume 6600, Noise and Fluctuations in Circuits, Devices, and Materials; 660011 (2007) https://doi.org/10.1117/12.724688
Event: SPIE Fourth International Symposium on Fluctuations and Noise, 2007, Florence, Italy
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.
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Ferran Martorell, Mark D. McDonnell, Derek Abbott, and Antonio Rubio "SNDR enhancement in noisy sinusoidal signals by non-linear processing elements", Proc. SPIE 6600, Noise and Fluctuations in Circuits, Devices, and Materials, 660011 (11 June 2007); https://doi.org/10.1117/12.724688
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