Outline process from the synthesis towards the nonlinear modeling of Bulk Acoustic Wave Filters

Acoustic Wave Transversal Filter for 5G N77 Band

“…The first discrepancy occurs due to the different frequency behavior between the lowpass BVD model and the bandpass BVD model [12]. This generates differences mostly at frequencies far from the 𝑓 𝑠 and 𝑓 𝑝 of the resonators.…”

“…Procedure to extract the required inverter JSLi for a given electroacoustic coupling, 𝑘 𝑒 2 Fig. 6 outlines, the lowpass prototype of a BVD model [12]. From the circuit model, we can identify the series resonant frequency, Ω 𝑠_𝑖 = −𝑋 𝑆𝑖 𝐿 𝑆𝑖 .…”

Synthesis Procedure for Ladder Acoustic Wave Filters Starting in Series Resonator

“…The synthesis procedure is based on the conventional element extraction method from a set of characteristic polynomials that define a Chebyshev response up to the obtaining of a ladder network configuration. The process is already explained in [3] but mainly, the impedance of the whole circuit is obtained with the characteristic polynomials as Then, a set of elements of the lowpass prototype are extracted from this input impedance that make up the configuration of an acoustic wave ladder filter (Fig. 1).…”

“…The motivation and objective of this work is to help into that direction by providing a new synthesis methodology for acoustic wave ladder filters starting in series resonator which results in more suitable configurations with reduction of the filter area. Previous synthesis methods force to extract a shunt input inductance when the filter configuration starts with a series resonator [3], which in some cases is impractical in real developments. The novelty of this method relies in a new synthesis methodology to extract a series inductance in filter configurations starting in series resonators.…”

“…Section II recalls the synthesis methodology of the startingshunt-inductance synthesis approach [3] and explains and compares the new synthesis approach starting with series inductance. Moreover, in the end of this section, an advanced configuration is presented where the filter itself does not need any matching element to properly work, since the effect of the input and output series inductance is absorbed by the input and output resonator, respectively.…”