6533b856fe1ef96bd12b1d7b
RESEARCH PRODUCT
Noise Analysis and Comparison of Phase-and Frequency-Detecting Readout Systems: Application to SAW Delay Line Magnetic Field Sensor
Eckhard QuandtAnne KittmannEnrico RubiolaJean-michel FriedtReinhard KnöchelPhillip DurdautMichael Hoftsubject
[SPI.OTHER]Engineering Sciences [physics]/OtherComputer scienceNoise reductionAcoustics010401 analytical chemistrySurface acoustic wavePhase (waves)Context (language use)01 natural sciences0104 chemical sciencesNoiseTransmission (telecommunications)Phase noiseLine (geometry)Electrical and Electronic EngineeringInstrumentationdescription
International audience; Transmission surface acoustic wave (SAW) sensors are widely used in various fields of application. In order to improve the limit of detection (LOD) of such sensor systems, it is essential to understand and quantify the relevant noise sources. Only then, strategies for noise reduction can be developed. In this paper, low noise readout systems for the application with SAW sensors in an open-loop and a closed-loop configuration are presented and experimentally investigated with regard to their phase noise on the example of a SAW delay line magnetic field sensor. Besides a comprehensive analysis of the phaseand frequency modulated signals, respectively, previously derived equations in a theoretic study for describing the LOD of both readout structures are utilized in the experimental context. According to the theory, the same LOD is also obtained in the experiment for all frequencies for which the noise contributions of the readout electronics are negligible. To the best of our knowledge, this is the first experimental study that directly compares both operating modes for the same sensor and in terms of the overall achievable LOD. The results are applicable to all kinds of phase-sensitive delay-line sensors.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2019-09-15 |