Modelling the Aging of Surface - Acoustic-Wave Devices.
01 January 1991
We present a study of the aging kinetics of a quartz-crystal surface-acoustic-wave (SAW) filter intended for application in an undersea telecommunication system. The study includes isothermal aging of 126 devices from five process lots of 591.2MHz filters. The phase-aging behavior is investigated at temperatures ranging from 50 to 200C and for aging times of up to 11,800 hours. At aging temperatures from 50 to 140C, a previously established SAW-device aging model describes the time dependence of the phase aging very well. Deviations from the model at higher temperatures are attributed to the onset of a second aging mechanism.