CN102571031B - 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
- Publication number
- CN102571031B CN102571031B CN201210019832.9A CN201210019832A CN102571031B CN 102571031 B CN102571031 B CN 102571031B CN 201210019832 A CN201210019832 A CN 201210019832A CN 102571031 B CN102571031 B CN 102571031B
- Authority
- CN
- China
- Prior art keywords
- wave filter
- broadband low
- surface wave
- acoustic surface
- loss
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Landscapes
- Surface Acoustic Wave Elements And Circuit Networks Thereof (AREA)
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 for realizing wavelet transformation, belonging to 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 engineer applied field, has become the mathematical tool that of scientific worker is important, in many engineer applied, has achieved significant effect.Compare with traditional Fourier-transformed signal processing method, owing to which overcoming the shortcoming of window fourier transform time-frequency resolving power difference, there is multiresolution analysis function, be therefore widely used in the fields such as signal of communication process.
Wavelet Transformation Algorithm is complicated, and in engineer applied, general all requirements can process in real time signal or require that signal processing circuit has fixing delay time, and therefore difficulty is larger.Existing employing SAW (Surface Acoustic Wave) device realizes in the technology of wavelet transformation, realize wavelet transformation, between the SAW (Surface Acoustic Wave) device of each yardstick, delay time is different, cause asynchrony phenomenon during signal transacting, this must compensate and could eliminate by carrying out delay circuit to the SAW (Surface Acoustic Wave) device of this yardstick, overall volume is become and is difficult to practicality greatly.And prior art adopts bidrectional transducer-bidrectional transducer structure (BDT-BDT structure), as shown in Figure 1, the insertion loss making SAW (Surface Acoustic Wave) device is comparatively large, seriously constrains its application in communication system signal process.In addition, the early stage bandwidth of a device realizing wavelet transformation narrow (relative bandwidth 1.5%), also cannot adapt to the application demand of large bandwidth.
Summary of the invention
The object of this invention is to provide a kind of Surface Acoustic Wave Filter group that can realize wavelet transformation, this Surface Acoustic Wave Filter group can realize process or signal processing circuit in real time and have the needs of fixing delay time, has large broadband and low-loss feature simultaneously.
In order to achieve the above object, technical scheme of the present invention there is provided a kind of broadband low-insertion-loss acoustic surface wave filter group for realizing wavelet transformation, it is characterized in that: be made up of N channel broadband low-insertion-loss acoustic surface wave filter, N >=1, each broadband low-insertion-loss acoustic surface wave filter is linear phase filter, they have equal delay time, the Q value of each broadband low-insertion-loss acoustic surface wave filter is identical, increase progressively in fixing multiple between their centre frequency, and each broadband low-insertion-loss acoustic surface wave filter intersects at three dB bandwidth place, wherein, each broadband low-insertion-loss acoustic surface wave filter comprises a piezoelectric substrate, piezoelectric substrate is placed with input single-phase unilateral transducer and output single-phase unilateral transducer along acoustic surface wave propagation direction.
Preferably, for the input single-phase unilateral transducer in the low-insertion-loss acoustic surface wave filter of each broadband and output single-phase unilateral transducer, or the reflecting electrode of any one wherein adopts apodization weighting, another reflecting electrode not weighting; Or the reflecting electrode of any one wherein adopts apodization weighting, another reflecting electrode adopts withdraw-weighted; Or the reflecting electrode of two all adopts withdraw-weighted; Or the employing withdraw-weighted of any one wherein, another reflecting electrode not weighting.
Preferably, the piezoelectric substrate that the broadband low-insertion-loss acoustic surface wave filter of each passage described is corresponding different.
Preferably, described different piezoelectric substrate adopts identical piezoelectric to make.
The present invention propose to adopt Surface Acoustic Wave Filter group realize wavelet transformation make full use of that the volume of SAW (Surface Acoustic Wave) device is little, highly sensitive, reproducible, stability is high, passive and can with the advantage such as digital technology is compatible, can realize processing in real time signal or signal processing circuit has the needs of fixing delay time.
The invention provides the surface acoustic wave wavelet transform filter group that a kind of broadband (relative bandwidth is greater than 3%), filter with low insertion loss (being less than 12dB), higher stopband that can be applicable to communication system suppresses (being greater than 45dB).Owing to have employed above technical scheme, the present invention is compared with the existing technology realizing wavelet transformation, have the following advantages and good effect: the invention solves with Surface Acoustic Wave Filter group realize wavelet transformation exist be difficult to realize processing or require that signal processing circuit has the problem of fixing delay time in real time, the filter of each passage is linear phase and identical group delay, and there is broadband, low insertion loss, be adapted to the feature of communication system analog intermediate frequency signal process.
Accompanying drawing explanation
Fig. 1 realizes the BDT-BDT structural representation that wavelet transformation adopts for employing SAW (Surface Acoustic Wave) device of the prior art;
Fig. 2 is for realizing the broadband low-insertion-loss acoustic surface wave filter group structural representation of wavelet transformation in the specific embodiment of the present invention;
Fig. 3 is the filter construction schematic diagram of a passage in Fig. 2, and adopt SPUDT-SPUDT structure, and left side interdigital transducer is withdraw-weighted, the right interdigital transducer is apodization weighting;
Fig. 4 is the filter construction schematic diagram of a passage in Fig. 2, adopt SPUDT-SPUDT structure, and the right and left interdigital transducer is withdraw-weighted;
Fig. 5 is the filter construction schematic diagram of a passage in Fig. 2, adopt SPUDT-SPUDT structure, and left side interdigital transducer is apodization weighting, the right interdigital transducer not weighting;
Fig. 6 is the filter construction schematic diagram of a passage in Fig. 2, adopt SPUDT-SPUDT structure, and left side interdigital transducer is withdraw-weighted, the right interdigital transducer not weighting.
Embodiment
For making the present invention become apparent, hereby with a preferred embodiment, and accompanying drawing is coordinated to be described in detail below.
As shown in Figure 2, a kind of broadband low-insertion-loss acoustic surface wave filter group for realizing wavelet transformation disclosed in the 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, exports as multichannel wavelet transform signal, and namely the output of each passage is exactly the signal of a road after the wavelet transformation of this yardstick.The broadband low-insertion-loss acoustic surface wave filter of each passage is produced on respective piezoelectric substrate, and adopts single phase unidirectional transducer (hereinafter referred to as SPUDT) structure to reduce insertion loss.The filter of each passage designs and produces respectively on multiple substrate, make the filter package of each passage in respective shell, then they are combined, form an entirety, it is a kind of multiple-piece bank of filters, even if when so in use having a certain path deterioration, other passage still can normally work.
The broadband low-insertion-loss acoustic surface wave filter of each passage has following feature: 1) be linear phase, and in bank of filters, the group delay of each filter is identical, is adapted to the process of communication system analog intermediate frequency signal.2) time delay is etc., thus the synchronous process that can realize analog signal and parallel processing, asynchronous when eliminating each passage processing signals.3) each filter is permanent Q value filter, and namely 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 increases progressively in fixing multiple, and each filter intersects at three dB bandwidth place, the 3dB frequency band of bank of filters is continuous, therefore can realize the process to a certain wide-band analog intermediate frequency signal, and the analog signal of frequency range to be processed will be needed undetected to this.
The invention provides the surface acoustic wave wavelet transform filter group that a kind of broadband (relative bandwidth is greater than 3%), filter with low insertion loss (being less than 12dB), higher stopband that can be applicable to communication system suppresses (being greater than 45dB).The invention solves with Surface Acoustic Wave Filter group realize wavelet transformation exist be difficult to realize processing or require that signal processing circuit has the problem of fixing delay time in real time, the filter of each passage is linear phase and identical group delay, and there is broadband, low insertion loss, be adapted to the feature of communication system analog intermediate frequency signal process.
Each single pass broadband low-insertion-loss acoustic surface wave filter in Fig. 2 realizes the wavelet transformation under a certain particular dimensions, here for one of them channel filter, now the relative bandwidth of the wavelet transform filter of this passage is 3%, when centre frequency 65MHz, three dB bandwidth is 1.95MHz.Filter passband ripple smooth (being less than 0.5dB), nonlinear phase skew little (being less than 10 degree), the group delay in passband little (550ns).Insertion Loss drop between passage is little (being 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 (referred to as SPUDT-SPUDT structure), comprises input single-phase unilateral transducer and output single-phase unilateral transducer.Two transducers can select an apodization weighting, another not weighting; Or an apodization weighting, another withdraw-weighted; Or both withdraw-weighteds; Or a withdraw-weighted, another not weighting.As shown in Figures 2 to 5, different implementation structures is given.
In broadband low-insertion-loss acoustic surface wave filter as shown in Figure 3, the reflecting electrode of input single-phase unilateral transducer adopts withdraw-weighted, and the reflecting electrode of output single-phase unilateral transducer adopts apodization weighting, and has adopted false fingering row to fill.Finger number is subject to the limitation of this figure size, just draws the signal of local.And in the design of reality, 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 unilateral transducer and output single-phase unilateral transducer all adopts withdraw-weighted, and has adopted false fingering row to fill.Finger number is subject to the limitation of this figure size, just draws the signal of local.And in the design of reality, 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 unilateral transducer adopts apodization weighting, the reflecting electrode not weighting of output single-phase unilateral transducer, and has adopted false fingering row to fill.Finger number is subject to the limitation of this figure size, just draws the signal of local.And in the design of reality, 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 unilateral transducer adopts withdraw-weighted, the reflecting electrode not weighting of output single-phase unilateral transducer, and has adopted false fingering row to fill.Finger number is subject to the limitation of this figure size, just draws the signal of local.And in the design of reality, the finger number of input transducer and output transducer will be a lot.
Claims (4)
1. one kind for realizing the broadband low-insertion-loss acoustic surface wave filter group of wavelet transformation, it is characterized in that: be made up of N channel broadband low-insertion-loss acoustic surface wave filter, N >=1, each broadband low-insertion-loss acoustic surface wave filter is linear phase filter, the outside of bank of filters is input as analog intermediate frequency signal, export as multichannel wavelet transform signal, namely the output of each passage is exactly the signal of a road after the wavelet transformation of particular dimensions, each broadband low-insertion-loss acoustic surface wave filter has equal delay time, the Q value of each broadband low-insertion-loss acoustic surface wave filter is identical, increase progressively in fixing multiple between the centre frequency of each broadband low-insertion-loss acoustic surface wave filter, and each broadband low-insertion-loss acoustic surface wave filter intersects at three dB bandwidth place, wherein, each broadband low-insertion-loss acoustic surface wave filter comprises a piezoelectric substrate, piezoelectric substrate is placed with input single-phase unilateral transducer and output single-phase unilateral transducer along acoustic surface wave propagation direction.
2. a kind of broadband low-insertion-loss acoustic surface wave filter group for realizing wavelet transformation as claimed in claim 1, it is characterized in that: for the input single-phase unilateral transducer in the low-insertion-loss acoustic surface wave filter of each broadband and output single-phase unilateral transducer, or the reflecting electrode of any one wherein adopts apodization weighting, another reflecting electrode not weighting; Or the reflecting electrode of any one wherein adopts apodization weighting, another reflecting electrode adopts withdraw-weighted; Or the reflecting electrode of two all adopts withdraw-weighted; Or the employing withdraw-weighted of any one wherein, another reflecting electrode not weighting.
3. a kind of broadband low-insertion-loss acoustic surface wave filter group for realizing wavelet transformation as claimed in claim 1, is characterized in that: the piezoelectric substrate that the broadband low-insertion-loss acoustic surface wave filter of each passage described is corresponding different.
4. a kind of broadband low-insertion-loss acoustic surface wave filter group for realizing wavelet transformation as claimed in claim 3, is characterized in that: described different piezoelectric substrate adopts identical piezoelectric to make.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210019832.9A CN102571031B (en) | 2012-01-21 | 2012-01-21 | Broadband low-insertion-loss surface acoustic wave filter set for realizing wavelet transformation |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210019832.9A CN102571031B (en) | 2012-01-21 | 2012-01-21 | Broadband low-insertion-loss surface acoustic wave filter set for realizing wavelet transformation |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102571031A CN102571031A (en) | 2012-07-11 |
| CN102571031B true CN102571031B (en) | 2015-05-06 |
Family
ID=46415619
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201210019832.9A Expired - Fee Related CN102571031B (en) | 2012-01-21 | 2012-01-21 | Broadband low-insertion-loss surface acoustic wave filter set for realizing wavelet transformation |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN102571031B (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2016095214A1 (en) | 2014-12-19 | 2016-06-23 | 华为技术有限公司 | Delay compensation apparatus |
| CN113659955B (en) * | 2021-08-20 | 2024-01-09 | 南通大学 | Surface acoustic wave amplifier capable of realizing wavelet reconstruction function |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7760960B2 (en) * | 2006-09-15 | 2010-07-20 | Freescale Semiconductor, Inc. | Localized content adaptive filter for low power scalable image processing |
-
2012
- 2012-01-21 CN CN201210019832.9A patent/CN102571031B/en not_active Expired - Fee Related
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
|---|
| Study of small size wavelet transform processor and wavelet inverse-transform processor using SAW devices;Wenke Lu等;《Measurement》;20110630;第44卷(第5期);第994-999页 * |
| 双通道滤波器组与小波变换;贾维敏等;《核电子学与探测技术》;20040531;第24卷(第3期);第249-252页 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN102571031A (en) | 2012-07-11 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN103973324B (en) | A kind of wideband digital receiver and real time spectrum processing method thereof | |
| CN109716336A (en) | The layering cascade of acoustic wave filter device two-dimensional finite element method simulation | |
| CN109831184B (en) | Band-pass filtering method, system, storage medium and terminal equipment | |
| CN105279350B (en) | The design method of approximate Perfect Reconstruction Vertical Nonuniform Cosine modulated filter group | |
| CN102165709A (en) | Signal processing method, signal processing device, and signal processing program | |
| CN102571031B (en) | Broadband low-insertion-loss surface acoustic wave filter set for realizing wavelet transformation | |
| CN112350691A (en) | Geomagnetic weak signal detection algorithm based on multi-stage filtering extraction and two-stage WOLA structure | |
| CN106059530A (en) | Half-band filter structure with frequency response weakly correlated with coefficient quantization digit | |
| Savioja et al. | Improved discrete-time modeling of multi-dimensional wave propagation using the interpolated digital waveguide mesh | |
| kumar Soni et al. | A design of IFIR prototype filter for Cosine Modulated Filterbank and Transmultiplexer | |
| CN102571025B (en) | A kind of wavelet transformation device for small low-insertion-loss single-scaling surface acoustic wave | |
| CN107294512A (en) | A kind of non-homogeneous wave filter group filtering method based on tree | |
| CN103647523B (en) | A kind of method reducing narrow transition band FIR low-pass filter implementation complexity | |
| CN103580644A (en) | Multichannel surface acoustic wave filter | |
| CN108427032B (en) | Frequency spectrum decomposition method and frequency-time inversion method | |
| CN105719255A (en) | Variable bandwidth linear phase filter method based on Laplacian pyramid structure | |
| Wei et al. | Frequency-response masking filters based on serial masking schemes | |
| CN104579239B (en) | A kind of filter method of filtering system | |
| Ogale et al. | Cosine Modulated Non-Uniform Filter Banks. | |
| CN203608172U (en) | Multichannel surface acoustic wave filter | |
| CN101473535A (en) | Method for processing a digital input signal in a digital domain and digital filter circuit for processing a digital input signal | |
| US9306606B2 (en) | Nonlinear filtering using polyphase filter banks | |
| Lehto et al. | Synthesis of wideband linear-phase FIR filters with a piecewise-polynomial-sinusoidal impulse response | |
| CN103166673B (en) | Ultra broadband ICS wireless discharging-directly station | |
| CN101854154B (en) | Design method of digital direct current trapper |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| ASS | Succession or assignment of patent right |
Owner name: NANTONG UNIVERSITY Effective date: 20130104 |
|
| C41 | Transfer of patent application or patent right or utility model | ||
| TA01 | Transfer of patent application right |
Effective date of registration: 20130104 Address after: 201620 Shanghai, North Renmin Road, Songjiang District, No. 2999 Applicant after: Donghua University Applicant after: Nantong University Address before: 201620 Shanghai, North Renmin Road, Songjiang District, No. 2999 Applicant before: Donghua University |
|
| C53 | Correction of patent of invention or patent application | ||
| CB02 | Change of applicant information |
Address after: 226019 Jiangsu city of Nantong province sik Road No. 9 Applicant after: Nantong University Applicant after: Donghua University Address before: 201620 Shanghai, North Renmin Road, Songjiang District, No. 2999 Applicant before: Donghua University Applicant before: Nantong University |
|
| COR | Change of bibliographic data |
Free format text: CORRECT: APPLICANT; FROM: DONGHUA UNIVERSITY TO: NANTONG UNIVERSITY |
|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20150506 Termination date: 20170121 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |