Voltage stress stabilized saw device

摘要

An oscillator or similar device employing a frequency setting SAW element having a piezoelectric substrate and an arrangement of interdigital finger transducers mounted thereon. In one embodiment, two interdigital finger transducers provide surface acoustic wave launching and reception respectively and in another embodiment, two additional transducers form a part of a discriminator circuit. Phase detection either between the electrical connections of the launching and receiving transducers or through the discriminator arrangement generates a feedback control signal which is applied across the ends of the substrate as a stress-controlling signal in a manner to compensate for temperature and other environmental factors which otherwise change the frequency of oscillation.