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This work presents a broadband characterization and modeling of the second harmonic nonlinear response in Bulk acoustic wave (BAW) resonators. The proposed circuit model is based on the constitutive equations describing the behavior of all materials used on the different layers of the resonator. These constitutive equations are extended for both the linear and nonlinear domain, and allow to explain...
As more LTE bands are squeezed into the crowded global RF spectrum interference becomes a major concern. Some cases require profoundly steep transitions from passband to the tightly packed neighboring bands. The most demanding high frequency LTE bands may only be served with high-performance BAW resonators that have been temperature compensated to have essentially zero temperature drift. There is...
Multi-band/multi-system mobile phones require a complex RF-frontend architecture. Complexity has increased to a point where adding switches and whole signal branches for an additional band is no longer cost effective. Alternative concepts involve `converged' power amplifiers and switching concepts supporting those. Filters and duplexers play a key role in converged architectures and their requirements...
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