Pure Premium Quartz (PPQ) synthesis for SAW resonators beyond the state of the art
Background, Motivation and Objective
Quartz crystal is a key material for the development of the first generations of cellular phones with frequency filters operating in the 70-350 MHz frequency range with a quality factor times frequency (Q×f) products reaching values around 9×1012. Recent developments aim at developing low phase noise oscillator, taking advantage of the compactness, temperature stability and resonance quality of resonators built on the so-called AT-cut family defined...



