Study of the phase noise of Langatate crystal resonators

In this paper, the intrinsic study on Langatate (LGT) crystal resonators has been carried out at 10 MHz resonant frequency. Among the crystals belonging to the Langasite family, the Langatate (La3Ga5.5Ta0.5O14) also called LGT seems to be an alternative option to substitute the quartz crystal resonators for frequency and time applications. The intrinsic properties like electromechanical coupling coefficients, product of quality factor and frequency are normally seen higher than in quartz crystal resonators. Moreover, the amplitude-frequency effect and the force-frequency coefficient are lower. The characterization of these resonators is given in terms of impedance, Q-factors, turnover temperature, amplitude-frequency effect and phase noise. The short-term stability of some resonator pairs has been measured about 31013 in terms of Allan standard deviation.