On the Need for Low Phase Noise Oscillators for Wireless Passive Sensor Probing

Abstract : Two oscillators are needed for passive wireless sensor readers: a radiofrequency local oscillator generating the carrier within the bandpass of the sensor, and a clock triggering analog to digital conversion of the signals returned by the sensor. We assess the influence on measurement resolution of these two oscillators, hinting at some design rules of the sensor based on the characteristics of the oscillators as driven by cost, size, or power consumption. We demonstrate that local oscillator phase noise is a significant parameter in assessing the resolution of passive acoustic sensor probed through a wireless link, although with different characteristic conditions whether the sensor is in a delay line configuration (short term --far from carrier -- response) or a resonator (long term -- close to carrier -- response).
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https://hal.archives-ouvertes.fr/hal-00767664
Contributor : Sarah Djaouti <>
Submitted on : Thursday, December 20, 2012 - 11:29:36 AM
Last modification on : Friday, July 6, 2018 - 3:06:08 PM

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  • HAL Id : hal-00767664, version 1

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J.-M. Friedt, N. Chrétien, B. François, G. Martin, S. Ballandras, et al.. On the Need for Low Phase Noise Oscillators for Wireless Passive Sensor Probing. SENSORDEVICES 2012 : The Third International Conference on Sensor Device Technologies and Applications, Aug 2012, Rome, Italy. pp.119-125. ⟨hal-00767664⟩

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