Plural saw oscillators producing combined high frequency output

摘要

A surface acoustic wave resonator has a plural number N of interdigital transducers arranged in a sequence on a piezoelectric substrate to generate N surface acoustic wave signals with a predetermined frequency f0 and having phase difference of 2 pi /N radian therebetween. Oscillation circuits are individually connected to the N interdigital transducers and generate N oscillation signals with the same frequency f0 and having phase difference of 2 pi /N radian therebetween. These oscillation signals are multiplied together to generate a signal with frequency N times the predetermined frequency f0.