Filter integrated filtering method capable of enhancing anti-interference ability

Abstract

The invention discloses a filter integrated filtering method capable of enhancing an anti-interference ability. The method sequentially implements the following steps: manufacturing an acoustic surface wave filter chip and a tuning substrate, wherein the tuning substrate is a high-frequency double-sided printed circuit board, the front central area of the tuning substrate is a chip bonding area, the front peripheral area of the tuning substrate is provided with a matching tuning circuit, and the back surface of the tuning substrate is provided with a large-area grounding metal film. Accordingto the filter integrated filtering method disclosed by the invention, the problems that the acoustic surface wave filter chip and the matching tuning circuit are separately arranged inside and outsidean encapsulation body, the complex interconnecting wire structure, great loss and poor anti-interference ability are caused, and obvious adverse effects on the overall performance of an acoustic surface wave filter application system are further caused in the prior art can be overcome, the filter integrated filtering method capable of enhancing the anti-interference ability is provided, during the application of the method, the interconnection structure among the acoustic surface wave filter chip, the matching tuning circuit and the application circuit can be simplified, and the advantages ofcompact structure, small loss and strong anti-interference ability can be achieved.

Description

technical field [0001] The invention relates to a filter, in particular to a filter integration filtering method for enhancing anti-interference ability. Background technique [0002] When the surface acoustic wave filter is connected to the application circuit, it is often necessary to set a tuning circuit between it and the front and rear circuits to achieve the matching of the electrical parameters between the device and the front and rear circuits, so as to exert the best performance of the surface acoustic wave filter. performance. The surface acoustic wave filter in the prior art generally adopts an independent packaging method, that is, each filter chip is placed in a package shell separately, and the matching tuning circuit is arranged outside the device package. The disadvantages brought about by this are The structure of the interconnection between the SAW filter and the external matching tuning circuit is relatively complex, the loss is large, and the anti-interf...

AI Technical Summary

Problems solved by technology

[0003] The present invention solves the problems existing in the prior art. In the prior art, the surface acoustic wave filter chip and the matching tuning circuit are separated inside and outside the package, and the structure of the interconnection line is complicated, the loss is large, and the anti-interference ability is poor, and the surface acoustic wave The overall performance of the filter application system has an obvious adverse effect, and a filter integrated filtering method that enhances the anti-interference ability is provided. When it is applied, it simplifies the interconnection between the surface acoustic wave filter chip, the matching tuning circuit and the application circuit. The structure has the advantages of compact structure, small loss, strong anti-interference ability, etc.