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Lithium Niobate MEMS Chirp Compressors for Near Zero Power Wake-Up Radios.
- Source :
- Journal of Microelectromechanical Systems; Dec2017, Vol. 26 Issue 6, p1204-1215, 12p
- Publication Year :
- 2017
-
Abstract
- This paper presents the first demonstration of chirp compressors based on laterally vibrating modes in suspended lithium niobate thin films. Both shear-horizontal and length-extensional modes have been explored and demonstrated with the electromechanical coupling coefficients of 30% and 39%, respectively, in a double-dispersive delay line structure. The high electromechanical coupling, along with the low propagation loss in the suspended thin film, produces a low insertion loss of 10 dB over a large fractional bandwidth of 50%. The best fabricated device demonstrates a delay-bandwidth product of 100, and provides a voltage gain of 5 to the corresponding chirp signals. Moreover, significant signal-to-noise ratio enhancements (>100), collectively enabled by the processing gain and filtering characteristics of the chirp compressors, have been demonstrated. The measured devices, in this paper, greatly outperform state-of-the-art chirp compressors based on surface acoustic waves in insertion loss for a comparable TB. As a result, signal-to-noise ratio enhancement and voltage gain have been simultaneously demonstrated for the first time in a passive device and the analog domain. The high performance can be harnessed to greatly enhance the sensitivity of near zero power wake-up radio receivers and enable low-power wireless connectivity for Internet of Things applications. [2017–0126] [ABSTRACT FROM PUBLISHER]
- Subjects :
- RADIO frequency
TRANSDUCERS
ELECTRONICS
BANDWIDTHS
SIGNAL processing
Subjects
Details
- Language :
- English
- ISSN :
- 10577157
- Volume :
- 26
- Issue :
- 6
- Database :
- Complementary Index
- Journal :
- Journal of Microelectromechanical Systems
- Publication Type :
- Academic Journal
- Accession number :
- 126527467
- Full Text :
- https://doi.org/10.1109/JMEMS.2017.2750176