About Quartz Crystal Resonator Noise: Recent Study

The first step, before investigating physical origins of noise in resonators, is to investigate correlations between external measurement parameters and the resonator noise. Tests and measurements are mainly performed on an advanced phase noise measurement system, recently set up. The resonator noise is examined as a function of the sensitivity to the drive level, the temperature operating point and the tuning capacitor.Comment: 20th International Conference on Noise and Fluctuations, Pisa : Italie (2009

Thermal Compensation in GaPO4 Beam Resonators: Experimental Evidence for Length Extensional Mode

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Frequency-Temperature Behavior of Langasite Rectangular Beam Resonators Vibrating in Length Extension

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A comparison of vibrating beam resonators in Quartz, GaPO(4), LGS and LGT

International audienceThe present paper reviews and compares the properties of vibrating beam resonators in length-extensional, flexural and cylindrical-torsional modes; resonators are designed and built with new piezoelectric materials: Gallium orthophosphate (GaPO(4)), Langasite (LGS) and Langatate (LGT). Their characteristics are compared with the results obtained with the same structures built in classical Quartz crystal. For all 3 new crystals, temperature-compensated cuts have been found for length-extensional and flexural modes by a theoretical analysis. Experiments have been made on test beams fabricated by conventional precision lapping/machining and photolithography to deposit electrodes. The existence of temperature-compensated cuts for length-extensional resonators is experimentally confirmed. The possibilities of using temperature-compensated cylindrical resonators in the torsional modes are analysed and their temperature sensitivity is computed

Analytical model of cylindrical cross-section resonators in GaPO vibrating in torsional modes

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Temperature compensated cuts for length–extensional and flexural vibrating modes in GaPO4 beam resonators

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Analytical model of cylindrical cross-section resonators in GaPO4_{\bf 4} vibrating in torsional modes

A theoretical investigation of cylindrical cross-section GaPO$_{4}$ vibrating beam resonators in torsional modes is given. Temperature effects are introduced by the approximate but classical method of varying effective material constants, beam dimensions and crystal mass density versus temperature. Temperature compensated cuts are presented. An equivalent circuit model and analysis of coupling factor versus crystal orientation are also reported

The effect of power-drive level on the calibration of the bridge instrument for the measurement of the quartz stability

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