An Adaptative Ratio-Metric Analog-To-Digital Interface For Weakly-Coupled Resonant Sensors Based On Mutually Injection-Locked Oscillators

2019 ◽  
Author(s):  
Ali Mostafa ◽  
Jerome Juillard ◽  
Joao R. Raposo ◽  
Pietro M. Ferreira
Keyword(s):  
Digital Interface ◽  
Analog To Digital ◽  
Resonant Sensors ◽  
Weakly Coupled ◽  
Injection Locked Oscillators

scholarly journals Iterative Signal Processing for Mitigation of Analog-to-Digital Converter Clipping Distortion in Multiband OFDMA Receivers

2012 ◽  
Vol 2012 ◽  
pp. 1-16 ◽  
Author(s):  
Markus Allén ◽  
Toni Levanen ◽  
Jaakko Marttila ◽  
Mikko Valkama
Keyword(s):  
Fundamental Problem ◽  
Turbo Decoding ◽  
Laboratory Measurements ◽  
Digital Interface ◽  
Analog To Digital ◽  
Front End ◽  
Digital Hardware ◽  
Receiver Performance ◽  
Almost All ◽  
Clipping Distortion

In modern wideband communication receivers, the large input-signal dynamics is a fundamental problem. Unintentional signal clipping occurs, if the receiver front-end with the analog-to-digital interface cannot respond to rapidly varying conditions. This paper discusses digital postprocessing compensation of such unintentional clipping in multiband OFDMA receivers. The proposed method iteratively mitigates the clipping distortion by exploiting the symbol decisions. The performance of the proposed method is illustrated with various computer simulations and also verified by concrete laboratory measurements with commercially available analog-to-digital hardware. It is shown that the clipping compensation algorithm implemented in a turbo decoding OFDM receiver is able to remove almost all the clipping distortion even under significant clipping in fading channel circumstances. That is to say, it is possible to nearly recover the receiver performance to the level, which would be achieved in the equivalent nonclipped situation.

scholarly journals About the Smart Weather Station

2016 ◽  
Vol 68 (1) ◽  
pp. 26-29
Author(s):  
Mihai Bogdan
Keyword(s):  
Data Sheet ◽  
Smart Sensors ◽  
Smart Sensor ◽  
Weather Station ◽  
Electronic Data ◽  
Digital Interface ◽  
New Approach ◽  
Analog To Digital ◽  
Electrical Signals ◽  
Weather Stations

Abstract Until recently, the Romanian weather stations utilized ordinary transducers that acquire useful information related to the desired physical inputs. These inputs will be converted into electrical signals easy to be processed by analog to digital converters. This paper proposed a new approach based on smart sensors system that change the interior behavior in order to optimize data acquirements from the environment. The smart sensor characteristics are stored into himself in a transducer electronic data sheet form (TEDS). The intelligent transducer generat together with the measured analogic signal also a digital interface. Through this interface the transducer’s catalog data can be read from the transducer.

scholarly journals A mode-localized MEMS electrical potential sensor based on three electrically coupled resonators

2017 ◽  
Vol 6 (1) ◽  
pp. 1-8 ◽  
Author(s):  
Chun Zhao ◽  
Graham S. Wood ◽  
Suan Hui Pu ◽  
Michael Kraft
Keyword(s):  
Frequency Shift ◽  
Dynamic Range ◽  
Electrostatic Force ◽  
Electrical Potential ◽  
Coupled Resonators ◽  
Mode Localization ◽  
Resonant Sensors ◽  
Current State ◽  
Weakly Coupled ◽  
Resonator System

Abstract. We report a new class of MEMS resonant potential sensor based on the mode localization effect using a 3-degree-of-freedom (DoF) electrically weakly coupled resonator system. As opposed to previously reported electrically coupled 2DoF mode-localized resonant sensors, it can be shown in theory that the 3DoF structure has an improved sensitivity without sacrificing signal transduction, in addition to a reduced nonideal effect with regard to the vibration amplitudes and the motional currents. Experimentally, it has also been shown that several orders of magnitude higher sensitivity can be achieved compared to frequency shift and 2DoF mode-localized sensor. In the best case, we are able to demonstrate over 4 orders of magnitude improvement in sensitivity compared to frequency shift as an output signal. Compared to current state-of-the art 2DoF mode-localized sensor, the highest sensitivity improvement is over 123 times. An estimation of the noise floor of the sensor is 614 µV / √Hz for potential sensing, or an equivalent 57.6e / √Hz for charge sensing, and a dynamic range of 66.3 dB can be achieved. Furthermore, two different approaches for detection were investigated, perturbing the stiffness in the form of either an axial electrostatic force or a change in electrostatic spring. We were able to demonstrate that the approach of changing electrostatic spring is more sensitive than its counterpart.

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