Measurement of Nonlinear Harmonic Signals Generated in SAW Resonators on 42° YX-LiTaO3 Substrate Using Spectrum Analyzer

Increasing integration and operating power of radio frequency front-ends (RFFE) gives rise to higher power density of RF components, which inevitably makes nonlinearity deterioration in surface acoustic wave (SAW) devices. This paper presents a measurement system of nonlinear harmonic signals in RF SAW devices using a spectrum analyzer (SA). The second- and third-order harmonics of SAW resonators on 42° YX-LiTaO3 substrate were measured precisely. In addition, harmonic signals are simulated by a nonlinear finite element method (FEM) model and compared to the measured results. Their generation mechanisms and behaviors at high input power levels are discussed. This investigation provides a perspective for further nonlinear suppression of SAW devices.