CN102571031A - Broadband low-insertion-loss surface acoustic wave filter set for realizing wavelet transformation - Google Patents
Broadband low-insertion-loss surface acoustic wave filter set for realizing wavelet transformation Download PDFInfo
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- CN102571031A CN102571031A CN2012100198329A CN201210019832A CN102571031A CN 102571031 A CN102571031 A CN 102571031A CN 2012100198329 A CN2012100198329 A CN 2012100198329A CN 201210019832 A CN201210019832 A CN 201210019832A CN 102571031 A CN102571031 A CN 102571031A
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Abstract
The present invention provides a broadband low-insertion-loss surface acoustic wave filter set for realizing wavelet transformation. The broadband low-insertion-loss surface acoustic wave filter set is characterized in that: the broadband low-insertion-loss surface acoustic wave filter set is composed of N channels of broadband low-insertion-loss surface acoustic wave filters, wherein N is larger than or equal with 1; each broadband low-insertion-loss surface acoustic wave filter is a linear phase wave filter and has equal delay time; the Q-value of each broadband low-insertion-loss surface acoustic wave filter is same; the central frequencies of the broadband low-insertion-loss surface acoustic wave filter increase progressively through a fixed multiple; and furthermore the broadband low-insertion-loss surface acoustic wave filters are crossed at the 3dB bandwidth. The broadband low-insertion-loss surface acoustic wave filter set settles problems of high difficulty of realizing real-time processing in wavelet transformation or requirement for fixed delay time in a signal processing circuit. Each channel of wave filter has linear phase and same group delay. The broadband low-insertion-loss surface acoustic wave filter set has the following characteristics: broad band, low insertion loss, and high suitability for intermediate frequency analog signal processing in a communication system.
Description
Technical field
The present invention relates to a kind of broadband low-insertion-loss acoustic surface wave filter group that is used to realize wavelet transformation, belong to the signal of communication process field.
Background technology
Wavelet transformation is just at developing new branch of mathematics, simultaneously as a kind of signal processing method, in the practical applications field, has become scientific worker's an important mathematical tool, in many practical applications, has obtained significant effect.Fourier-transformed signal processing method with traditional is compared, because it has overcome the shortcoming of window fourier transform time-frequency resolving power difference, has the multiresolution analysis function, therefore is widely used in fields such as signal of communication processing.
Wavelet Transformation Algorithm is complicated, and general all requirements can be handled or require signal processing circuit to have fixing delay time signal in real time in practical applications, so difficulty is bigger.Existing employing SAW device is realized in the technology of wavelet transformation; Realize wavelet transformation; Delay time is different between the SAW device of each yardstick; Asynchrony phenomenon when having caused signal processing, this must carry out the delay circuit compensation through the SAW device to this yardstick could eliminate, and makes overall volume become and is difficult to practicality greatly.And prior art adopts bidrectional transducer-bidrectional transducer structure (BDT-BDT structure), and is as shown in Figure 1, makes that the insertion loss of SAW device is bigger, seriously restricted its application in communication system signal is handled.In addition, the bandwidth of a device of early stage realization wavelet transformation narrow (relative bandwidth 1.5%) also can't adapt to the application demand of big bandwidth.
Summary of the invention
The purpose of this invention is to provide a kind of SAW filter group that can realize wavelet transformation; This SAW filter group can realize that processing in real time or signal processing circuit have the needs of fixing delay time, have big broadband and low-loss characteristic simultaneously.
In order to achieve the above object; Technical scheme of the present invention has provided a kind of broadband low-insertion-loss acoustic surface wave filter group that is used to realize wavelet transformation, it is characterized in that: constitute N >=1 by N passage broadband low-insertion-loss acoustic surface wave filter; Each broadband low-insertion-loss acoustic surface wave filter is linear phase filter; They have equal delay time, and the Q value of each broadband low-insertion-loss acoustic surface wave filter is identical, and being fixedly between their centre frequency, multiple increases progressively; And each broadband low-insertion-loss acoustic surface wave filter intersects at the three dB bandwidth place; Wherein, each broadband low-insertion-loss acoustic surface wave filter comprises a piezoelectric substrate, and the acoustic surface wave propagation direction is placed with input single phase unidirectional transducer and output single phase unidirectional transducer in the piezoelectric substrate upper edge.
Preferably, for input single phase unidirectional transducer in each broadband low-insertion-loss acoustic surface wave filter and output single phase unidirectional transducer, perhaps wherein any one reflecting electrode adopts and cuts toe weighting, another not weighting of reflecting electrode; Perhaps wherein any one reflecting electrode adopts and cuts the toe weighting, and another reflecting electrode adopts withdraw-weighted; Perhaps two reflecting electrode all adopts withdraw-weighted; Perhaps wherein any one employing withdraw-weighted, another not weighting of reflecting electrode.
Preferably, the corresponding different piezoelectric substrate of broadband low-insertion-loss acoustic surface wave filter of said each passage.
Preferably, said different piezoelectric substrate adopts identical piezoelectric to make.
The present invention proposes to adopt that the SAW filter group realizes that wavelet transformation makes full use of that the volume of SAW device is little, highly sensitive, good reproducibility, stability is high, passive and can with advantage such as digital technology compatibility, can realize signal is handled or signal processing circuit has the needs of fixing delay time in real time.
The invention provides a kind of broadband (relative bandwidth is greater than 3%) that can be applicable to communication system, low Insertion Loss (less than 12dB), higher stopband and suppress the surface acoustic wave wavelet transform filter group of (greater than 45dB).Owing to adopted above technical scheme; The present invention and the existing compared with techniques that realizes wavelet transformation; Have the following advantages and good effect: the invention solves with SAW filter group being difficult to of realizing that wavelet transformation exists and realize handling in real time or require signal processing circuit to have the problem of fixing delay time; The filter of each passage is linear phase and identical group delay, and has broadband, low insertion loss, is adapted to the characteristics that the communication system analog intermediate frequency signal is handled.
Description of drawings
Fig. 1 realizes the BDT-BDT structural representation that wavelet transformation adopted for employing SAW device of the prior art;
Fig. 2 is for being used to realize the broadband low-insertion-loss acoustic surface wave filter group structural representation of wavelet transformation in the embodiment of the present invention;
Fig. 3 is the filter construction sketch map of a passage among Fig. 2, adopts the SPUDT-SPUDT structure, and left side interdigital transducer is withdraw-weighted, and the right interdigital transducer is for cutting the toe weighting;
Fig. 4 is the filter construction sketch map of a passage among Fig. 2, adopt the SPUDT-SPUDT structure, and the right and left interdigital transducer is withdraw-weighted;
Fig. 5 is the filter construction sketch map of a passage among Fig. 2, adopt the SPUDT-SPUDT structure, and left side interdigital transducer is for cutting the toe weighting, the right not weighting of interdigital transducer;
Fig. 6 is the filter construction sketch map of a passage among Fig. 2, adopts the SPUDT-SPUDT structure, and left side interdigital transducer is withdraw-weighted, the right not weighting of interdigital transducer.
Embodiment
For making the present invention more obviously understandable, now with a preferred embodiment, and conjunction with figs. elaborates as follows.
As shown in Figure 2, the disclosed a kind of broadband low-insertion-loss acoustic surface wave filter group that is used to realize wavelet transformation of present embodiment is made up of multichannel broadband low-insertion-loss acoustic surface wave filter.The outside of bank of filters is input as analog intermediate frequency signal, is output as multichannel wavelet transform signal, i.e. the output of each passage is exactly one tunnel wavelet transformation signal afterwards through this yardstick.The broadband low-insertion-loss acoustic surface wave filter of each passage is produced on the piezoelectric substrate separately, and adopts single phase unidirectional transducer (hereinafter to be referred as SPUDT) structure to insert loss to reduce.The filter of each passage designs and produces respectively on a plurality of substrates; Make the filter package of each passage in shell separately; Combining them then, constitute an integral body, is a kind of multiple-piece bank of filters; Even when so in use having a certain passage to damage, other passage still can operate as normal.
The broadband low-insertion-loss acoustic surface wave filter of each passage has following characteristic: 1) be linear phase, and the group delay of each filter is identical in the bank of filters, is adapted to the communication system analog intermediate frequency signal and handles.2) time-delay such as be, thereby can realize Synchronous Processing and parallel processing, asynchronous when having eliminated each passage processing signals analog signal.3) each filter is permanent Q value filtering device, and promptly the relative bandwidth of each filter is identical, but the centre frequency of each filter is different, so the 3dB absolute bandwidth of each filter is different.4) centre frequency is fixedly that multiple increases progressively, and each filter intersects at the three dB bandwidth place, and the 3dB frequency band of bank of filters is continuous, thus can realize processing to a certain wideband section analog intermediate frequency signal, and can be to the analog signal omission of this frequency range that need handle.
The invention provides a kind of broadband (relative bandwidth is greater than 3%) that can be applicable to communication system, low Insertion Loss (less than 12dB), higher stopband and suppress the surface acoustic wave wavelet transform filter group of (greater than 45dB).The invention solves with SAW filter group being difficult to of realizing that wavelet transformation exists and realize handling in real time or require signal processing circuit to have the problem of fixing delay time; The filter of each passage is linear phase and identical group delay; And have broadband, low insertion loss, be adapted to the characteristics that the communication system analog intermediate frequency signal is handled.
The single pass broadband of among Fig. 2 each low-insertion-loss acoustic surface wave filter is realized the wavelet transformation under a certain particular dimensions; Here be example with one of them single channel filter; The relative bandwidth of the wavelet transform filter of this passage is 3% at this moment; When centre frequency 65MHz, three dB bandwidth is 1.95MHz.Filter passband ripple smooth (less than 0.5dB), nonlinear phase skew little (less than 10 degree), the group delay little (550ns) in the passband.Insertion Loss drop between the passage little (less than 0.25dB).In the present embodiment, each broadband low-insertion-loss acoustic surface wave filter can adopt single phase unidirectional transducer-single phase unidirectional transducer structure (abbreviating the SPUDT-SPUDT structure as), comprises input single phase unidirectional transducer and output single phase unidirectional transducer.Two transducers can select one to cut toe weighting, another not weighting; Or one cut the toe weighting, another withdraw-weighted; Or two withdraw-weighteds all; Or a withdraw-weighted, another not weighting.To shown in Figure 5, provided different implementation structures like Fig. 2.
In broadband low-insertion-loss acoustic surface wave filter as shown in Figure 3, the reflecting electrode of input single phase unidirectional transducer adopts withdraw-weighted, and the reflecting electrode of output single phase unidirectional transducer adopts cuts the toe weighting, and has adopted false fingering row to fill.The finger number receives the limitation of this figure size, the local signal of just drawing.And in practical design, the finger number of input transducer and output transducer will be a lot.
In broadband low-insertion-loss acoustic surface wave filter as shown in Figure 4, the reflecting electrode of input single phase unidirectional transducer and output single phase unidirectional transducer all adopts withdraw-weighted, and has adopted false fingering row to fill.The finger number receives the limitation of this figure size, the local signal of just drawing.And in practical design, the finger number of input transducer and output transducer will be a lot.
In broadband low-insertion-loss acoustic surface wave filter as shown in Figure 5, the reflecting electrode of input single phase unidirectional transducer adopts cuts the toe weighting, the not weighting of reflecting electrode of output single phase unidirectional transducer, and adopted false fingering row to fill.The finger number receives the limitation of this figure size, the local signal of just drawing.And in practical design, the finger number of input transducer and output transducer will be a lot.
In broadband low-insertion-loss acoustic surface wave filter as shown in Figure 6, the reflecting electrode of input single phase unidirectional transducer adopts withdraw-weighted, the not weighting of reflecting electrode of output single phase unidirectional transducer, and adopted false fingering row to fill.The finger number receives the limitation of this figure size, the local signal of just drawing.And in practical design, the finger number of input transducer and output transducer will be a lot.
Claims (4)
1. broadband low-insertion-loss acoustic surface wave filter group that is used to realize wavelet transformation; It is characterized in that: constitute by N passage broadband low-insertion-loss acoustic surface wave filter; N >=1, each broadband low-insertion-loss acoustic surface wave filter is linear phase filter, and they have equal delay time; The Q value of each broadband low-insertion-loss acoustic surface wave filter is identical; Be fixedly between their centre frequency that multiple increases progressively, and each broadband low-insertion-loss acoustic surface wave filter intersects at the three dB bandwidth place, wherein; Each broadband low-insertion-loss acoustic surface wave filter comprises a piezoelectric substrate, and the acoustic surface wave propagation direction is placed with input single phase unidirectional transducer and output single phase unidirectional transducer in the piezoelectric substrate upper edge.
2. a kind of broadband low-insertion-loss acoustic surface wave filter group that is used to realize wavelet transformation as claimed in claim 1; It is characterized in that: for input single phase unidirectional transducer in each broadband low-insertion-loss acoustic surface wave filter and output single phase unidirectional transducer; Perhaps wherein any one reflecting electrode adopts and cuts toe weighting, another not weighting of reflecting electrode; Perhaps wherein any one reflecting electrode adopts and cuts the toe weighting, and another reflecting electrode adopts withdraw-weighted; Perhaps two reflecting electrode all adopts withdraw-weighted; Perhaps wherein any one employing withdraw-weighted, another not weighting of reflecting electrode.
3. a kind of broadband low-insertion-loss acoustic surface wave filter group that is used to realize wavelet transformation as claimed in claim 1 is characterized in that: the corresponding different piezoelectric substrate of broadband low-insertion-loss acoustic surface wave filter of said each passage.
4. a kind of broadband low-insertion-loss acoustic surface wave filter group that is used to realize wavelet transformation as claimed in claim 2 is characterized in that: said different piezoelectric substrate adopts identical piezoelectric to make.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106464258A (en) * | 2014-12-19 | 2017-02-22 | 华为技术有限公司 | Delay compensation apparatus |
| CN113659955A (en) * | 2021-08-20 | 2021-11-16 | 南通大学 | Surface acoustic wave amplifier capable of realizing wavelet reconstruction function |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20080069469A1 (en) * | 2006-09-15 | 2008-03-20 | Freescale Semiconductor Inc. | Localized content adaptive filter for low power scalable image processing |
| CN101212210A (en) * | 2006-12-31 | 2008-07-02 | 中国科学院声学研究所 | Switchable surface acoustic wave filter bank with two channel bandwidths |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20080069469A1 (en) * | 2006-09-15 | 2008-03-20 | Freescale Semiconductor Inc. | Localized content adaptive filter for low power scalable image processing |
| CN101212210A (en) * | 2006-12-31 | 2008-07-02 | 中国科学院声学研究所 | Switchable surface acoustic wave filter bank with two channel bandwidths |
Non-Patent Citations (2)
| Title |
|---|
| WENKE LU等: "Study of small size wavelet transform processor and wavelet inverse-transform processor using SAW devices", 《MEASUREMENT》 * |
| 贾维敏等: "双通道滤波器组与小波变换", 《核电子学与探测技术》 * |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106464258A (en) * | 2014-12-19 | 2017-02-22 | 华为技术有限公司 | Delay compensation apparatus |
| CN106464258B (en) * | 2014-12-19 | 2019-06-18 | 华为技术有限公司 | A kind of compensation of delay device |
| US10333492B2 (en) | 2014-12-19 | 2019-06-25 | Huawei Technologies Co., Ltd. | Delay compensation apparatus |
| CN113659955A (en) * | 2021-08-20 | 2021-11-16 | 南通大学 | Surface acoustic wave amplifier capable of realizing wavelet reconstruction function |
| WO2023020306A1 (en) * | 2021-08-20 | 2023-02-23 | 南通大学 | Surface acoustic wave amplifier capable of achieving wavelet reconstruction function |
| CN113659955B (en) * | 2021-08-20 | 2024-01-09 | 南通大学 | Surface acoustic wave amplifier capable of realizing wavelet reconstruction function |
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