Abstract
In this work, the non-linearities of a 3G/UMTS geared BandPass Bulk Acoustic Wave ladder filter com- posed of five resonators were modeled using non-linear modified Butterworth-Van Dyke model. The non-linear characteristics were measured and simulated, and they were compared and found to be fairly identical. The filter's central frequency is 2.12 GHz, the corresponding band- width is 61.55 MHz, and the quality factor is 34.55.
Highlights
Bulk Acoustic Wave (BAW) and Thin-Film Bulk Acoustic Resonator (FBAR) based filters have been proven for small footprint high power applications
In this paper we have studied a Solidly-Mounted Resonator (SMR) based ladder band pass filter
We study our fabricated BAW filter (Fig. 3)
Summary
Bulk Acoustic Wave (BAW) and Thin-Film Bulk Acoustic Resonator (FBAR) based filters have been proven for small footprint high power applications. Owing to their reduced size, and their CMOS process compatibility, they are integrable in common RF ICs that operate in the GHz and sub GHz spectrum, which is a difficult feat using conventional microstrip technology. Modeling of the nonlinear behavior of BAW filters is an active research area. For more complex filter structures, and when the individual characteristics of the resonators are unknown and/or influenced by other phenomena such as thermal influence or fabrication defects, the resonator by resonator approach becomes impracticable [2], [3]. A grey box approach is required due to the number of unknowns involved
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