An acoustic filter and signal processing device

By setting target series and parallel resonant units in the acoustic filter and adjusting their resonant frequency, a new transmission zero point is provided, which solves the problems of skirt steepness and performance loss in the prior art and achieves higher skirt steepness and better out-of-band suppression performance.

CN122226010APending Publication Date: 2026-06-16SHANGHAI XIN OU INTEGRATED TECH CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2026-01-23
Publication Date
2026-06-16

AI Technical Summary

Technical Problem

In the prior art, in order to improve the skirt steepness of acoustic filters, capacitors and inductors are usually introduced or the electromechanical coupling coefficient is adjusted, which leads to an increase in the overall loss of the filter and affects its performance.

Method used

An acoustic filter is designed by setting target series resonant units and target parallel resonant units in the resonant unit and adjusting their resonant frequencies to provide a new transmission zero point for the filter without affecting the passband response, thereby improving the skirt steepness and out-of-band rejection performance.

Benefits of technology

This technology improves the skirt steepness and out-of-band rejection performance of acoustic filters, reduces frequency drift, enhances temperature stability, and simplifies design without introducing capacitors and inductors.

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Abstract

The embodiment of the application provides an acoustic filter and a signal processing device, the acoustic filter is provided with a resonance unit between an input end and an output end, the resonance unit comprises m series resonance units and n parallel resonance units, and at least one target series resonance unit and / or at least one target parallel resonance unit are included in the resonance unit; the resonance frequency of the target series resonance unit is set to be the lowest in all the resonance units, and the resonance frequency of the target parallel resonance unit is set to be the highest in all the resonance units. In this way, the acoustic filter can provide a new transmission zero point for the left side of the passband of the acoustic filter based on the target series resonance unit, and at the same time, or provide a new transmission zero point for the right side of the passband of the acoustic filter based on the target parallel resonance unit, so that the skirt steepness and the out-of-band suppression performance are effectively improved without affecting the passband response, the frequency drift of the skirt is reduced, and the temperature stability is enhanced.
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