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FBAR filter circuit structure

A circuit structure and filter technology, which is applied in the field of filters, can solve the problems that the transmission zero point is easy to deviate from the design value, and it is difficult to achieve high out-of-band suppression, so as to achieve the effect of improving out-of-band suppression

Pending Publication Date: 2022-03-25
CHINA ELECTRONICS TECH GRP NO 26 RES INST
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0003] Aiming at the deficiencies of the above-mentioned prior art, the technical problem to be solved by the present invention is: how to provide a kind of FBAR filter circuit structure, to solve the difficulty in realizing high out-of-band rejection in the prior art, and under the influence of the external electromagnetic environment, The problem that its transmission zero point is easy to deviate from the design value

Method used

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Embodiment Construction

[0021] The present invention will be further described in detail below in conjunction with the accompanying drawings.

[0022] For specific implementation: see Figure 1 to Figure 4 , a FBAR filter circuit structure, including a series filter module 1 and a notch module 2, one end of the filter module 1 as the input or output of the FBAR filter circuit structure, the other end of the filter module 1 is connected One end of the notch module 2, the other end of the notch module 2 is used as the output or input of the FBAR filter circuit structure, and the notch module 2 is used to form a transmission in the stop band of the FBAR filter circuit zero. By adjusting the values ​​of the first resonator 201 and the first inductor 202 in the notch module 2, a transmission zero point is formed in the stop band of the FBAR filter circuit to improve out-of-band rejection.

[0023] The notch module 2 includes two first resonators 201 and a first inductance 202 connected in series; one en...

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Abstract

The invention discloses an FBAR filter circuit structure which is characterized in that the FBAR filter circuit structure comprises a filtering module and a notch module, and the notch module is connected with the input end or the output end of the filtering module and used for forming a transmission zero point in a stop band of an FBAR filter circuit. According to the FBAR filter circuit, the notch module and the filtering module which are connected in series are adopted, the notch module can form a transmission zero point in the stop band of the FBAR filter circuit, so that out-of-band rejection can be improved, and the position of the transmission zero point of the FBAR filter circuit can be accurately controlled by adjusting the resonant frequency of the first resonator in the notch module.

Description

technical field [0001] The invention belongs to the technical field of filters, in particular to a film bulk acoustic resonator (FilmBulkAcoustic Resonator, FBAR) filter circuit structure. Background technique [0002] With the rapid development of wireless communication technology, many radio frequency devices have been widely used in the communication field. For example, a large number of filters will be used in personal mobile terminals such as mobile phones. Filters are mainly used to filter out unwanted RF signals and improve the performance of the transmit path or receive path. At present, the communication system is developing in the direction of multi-band, multi-system, and multi-mode, and the frequency bands used are becoming more and more dense. In order to improve the communication quality and reduce the interference between frequency bands, it is bound to put forward higher requirements for the out-of-band suppression of the filter. In the prior art, the out-of...

Claims

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Application Information

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IPC IPC(8): H03H9/02H03H9/56H03H9/58
CPCH03H9/02007H03H9/564H03H9/582
Inventor 唐小龙杜雪松李华莉张华张必壮蒋平英徐阳刘娅邢赢徐瑞豪刘繁张建清魏星王婷婷
Owner CHINA ELECTRONICS TECH GRP NO 26 RES INST