Abstract
Passive radiofrequency filters and resonators exploited for telecommunication applications are generally based on surface or bulk acoustic wave (SAW or BAW) devices. However, these devices present some technological limits as short-circuits between the electrodes of the interdigital transducers (for SAW devices) or an accurate control of the resonator dimension (plate or film thickness for BAW devices). An alternative concept based on periodically poled transducers (PPT) implemented on ferroelectric substrates (LiNbO3 or LiTaO3) embedded between two guiding substrates yielding advanced packaging opportunities has been developed. An oscillator stabilized by such a PPT-based resonator operating at 131 MHz has been successfully fabricated. A phase noise of −165 dBc/Hz at 60 kHz from the carrier has been measured with an input power of 2 mW and a relative short term frequency stability of 10−9 per second. Other resonators built on waveguides exploiting thinned PPTs (around thirty microns) have allowed the excitation of only one contribution with a thermal sensibility equal to the one of the guiding materials (−30 ppm/K for silicon).
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