EP0212418A2 - Dispositif de convolution à ondes acoustiques - Google Patents

Dispositif de convolution à ondes acoustiques Download PDF

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Publication number
EP0212418A2
EP0212418A2 EP86110765A EP86110765A EP0212418A2 EP 0212418 A2 EP0212418 A2 EP 0212418A2 EP 86110765 A EP86110765 A EP 86110765A EP 86110765 A EP86110765 A EP 86110765A EP 0212418 A2 EP0212418 A2 EP 0212418A2
Authority
EP
European Patent Office
Prior art keywords
interdigital
input
converters
input signal
converter
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.)
Withdrawn
Application number
EP86110765A
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German (de)
English (en)
Other versions
EP0212418A3 (fr
Inventor
Hans-Peter Dr. Grassl
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Siemens AG
Siemens Corp
Original Assignee
Siemens AG
Siemens Corp
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Siemens AG, Siemens Corp filed Critical Siemens AG
Publication of EP0212418A2 publication Critical patent/EP0212418A2/fr
Publication of EP0212418A3 publication Critical patent/EP0212418A3/fr
Withdrawn legal-status Critical Current

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    • G—PHYSICS
    • G06—COMPUTING OR CALCULATING; COUNTING
    • G06G—ANALOGUE COMPUTERS
    • G06G7/00—Devices in which the computing operation is performed by varying electric or magnetic quantities
    • G06G7/12—Arrangements for performing computing operations, e.g. operational amplifiers specially adapted therefor
    • G06G7/19—Arrangements for performing computing operations, e.g. operational amplifiers specially adapted therefor for forming integrals of products, e.g. Fourier integrals, Laplace integrals or correlation integrals; for analysis or synthesis of functions using orthogonal functions
    • G06G7/195—Arrangements for performing computing operations, e.g. operational amplifiers specially adapted therefor for forming integrals of products, e.g. Fourier integrals, Laplace integrals or correlation integrals; for analysis or synthesis of functions using orthogonal functions using electro- acoustic elements

Definitions

  • the present invention relates to a convolver arrangement with acoustic waves traveling in a substrate surface.
  • Convolver acoustic waves are known for example from Proc. IEEE, Ultrasoncis Symposium (1974), pp. 224-227 u. (1981), pp. 181-185.
  • the acoustic waves used in connection with such electrical arrangements are those that run in a substrate close to the surface or in the surface.
  • Such acoustic waves are known as Rayleigh waves, lead stone waves, love waves, SSBW waves, SABW waves and the like, which are referred to in the following in general terms as surface waves (although essentially only the first two types of surface waves in the narrower range Senses are).
  • a surface wave convolver is an electrical device for very high frequencies, especially from the MHz range. Such a convolver is used for processing e.g. Binary Orthogonal Keying (BOK) signals are used.
  • BOK Binary Orthogonal Keying
  • a convolver is an assembly arranged on one surface of a substrate, for example lithium niobate provision of several structures. These include an interdigital structure as an input converter for the input signal to be processed. This also includes an interdigital converter as an input converter for a reference signal. These two input transducers are arranged opposite one another in the direction or in the axis of the path of the acoustic waves. Between them is the integration electrode, which is usually a strip arranged on the substrate surface. The width of the integration electrode measured transversely to the axis of the path of the wave propagation is generally considerably smaller than the width or finger length of the input digital converter measured in parallel thereto.
  • a beam compression structure is inserted between these structures to adapt the apertures.
  • the electrical output of such a convolver is a connection connected to the integration electrode.
  • Such a convolver delivers a convolution signal of these two input signals from an input signal and a reference signal.
  • interference effects occur which are based on undesired additional functions of individual or several structures of the arrangement.
  • reflections of the acoustic waves on the transducer fingers are known as an interference effect.
  • An effective measure against these reflections is the design of those interdigital transducers, which can cause disturbing reflections, as split finger structures.
  • a self-folding signal can occur as an interference signal, ie a folding signal is formed from the acoustic wave of the signal which is intended to run in one direction of the convolver and the reflected wave of this input signal which undesirably runs in the opposite direction at the input converter for the reference signal.
  • the respective distances between the end of the integration electrode and the beginning of the input converter for the reference signal can be made different in size by this value lambda / 2 (or odd multiples of lambda / 2).
  • An equivalent measure is to provide such a difference in distance on the input side for the input signal.
  • Another equivalent measure is to design the two interdigital transducers, which form a pair of input transducers, for the input signal or for the reference signal in their interdigital structure in such a way that they each generate such an acoustic wave, that is, send out waves together between which there is a 180 ° phase shift. Measures of this type ensure that the waves impinging on a pair of transducers always generate signals in this pair, the sum of which is zero. This prevents regeneration, ie re-emission of waves, which would occur due to a voltage induced at the terminating resistor which terminates the interconnection of a pair of transducers.
  • matching networks are required to supply the input signal and the reference signal. It is clearly advantageous if identical matching networks, namely the simplest possible, can be used for the input signal and for the reference signal.
  • the simplest matching network is an inductor. This is problem-free both for a simple convolver and for a convolver as described above with two convolver structures for compensation of the self-folding signal. Either only a single input converter is provided at each end, or there are two input converters connected in parallel, which form a pair of converters. It should be noted that such a parallel connection can also be implemented structurally, i.e.
  • a single (essentially twice as wide) interdigital converter can be used, which is the input converter for the two convolver structures (the convolver with self-folding compensation).
  • an interposed multistrip coupler inserts such a coupling between the input transducer and the two convolver structures, which compensate for the self-folding signal.
  • Corresponding adaptation networks are required for signals, which in the narrower sense are not part of the surface wave convolver. However, it is necessary that the relevant converter of the convolver is adapted to the adaptation network, or that the respective adaptation network is adapted to the relevant convolver input converter. This leads to corresponding diversity.
  • the object of the present invention is to provide measures for the convolution of an input signal (E) with two reference signals (A and B) which do not require any significant additional effort compared to known arrangements (with only one reference signal).
  • the invention should also be suitable for arrangements with compensation as self-folding.
  • the invention is based on the idea of providing only such input converters for the convolver arrangement with two reference signals and one input signal, or of being able to use the advantageous specification for the creation of the overall design for their convolvers that all input converters of the arrangement have basically the same design.
  • “basically” the same design is to be understood that all input converters used in a convolver in question need not be completely identical, but differ only in subtleties.
  • the term “subtleties” is not to be regarded as subordinate in all respects. This delicacy of the difference is in fact electrically decisive in the invention. With regard to the technological implementation or manufacture of the converter in question, however, this delicacy does not represent anything of the kind shows what could require special additional technology or computer effort.
  • a basic idea belonging to the invention is to base the design with regard to the input transducers, specifically both the transducer for the input signal and that for the reference signals, on the split finger principle.
  • the input converters for the reference signals are actually split-finger interdigital converters in the conventional sense.
  • the input transducers for the input signal would also be split-finger transducers if their floating fingers as well as the respectively adjacent interdigital fingers were electrically connected in one or the other comb structure. Unless you follow the path of first producing all input converters uniformly and subsequently every second finger e.g.
  • these two transducer configurations which differ from one another only with regard to the floating fingers, can advantageously be produced with two templates, namely a template for the reference signal converter and a template for the input signal converter.
  • both templates based on the same design, ie the filter design only needs to be made once for both templates.
  • a template is either to be understood as a mask or it is the respective program that is to be entered into the automatically operating exposure device for the photolithographic production of the finger structures in both cases.
  • Figure 1 shows a first embodiment of a convolver arrangement 1 relevant to the invention, namely with two input signal converters 3, 4 and two reference signal converters 5, 6.
  • 7 and 8 each denote an integration electrode, which is known to be strip-shaped metallization coatings on the surface of the Substrate body 2 are.
  • 11 denotes jet compressors which are known per se and are adapted to be used for the individual case. These can be area-related occupancies and / or stripe structures.
  • 9 and 10 denote the two output connections of the convolver, namely the outputs for the folding signal I and for the folding signal II.
  • 14 denotes an input signal adaptation network with an input 114 for the input signal.
  • 15 each denotes a reference signal adaptation network, namely for the reference signal A at the input 115 and for the reference signal B at the input 116.
  • the two input signal converters 3 and 4 are connected in parallel.
  • One comb structure each The transducers 3 and 4 are connected to one another and to the output 214 of the input signal adaptation network 14.
  • the two other comb structures of the transducers 3 and 4 are connected to a reference potential or to ground.
  • a comb structure is in turn connected to one another and to the reference potential or to ground.
  • the other two comb structures of the converter 5 and the converter 6 are connected to the respective output 215 and 216 of the reference signal adaptation networks 15.
  • the converter 5 (or 6) shown in FIG. 2 is a split finger interdigital converter, consisting of the two comb structures 51 and 52, and in which the split finger pairs 53, 54 (as shown) interlock. With 55 and 56 associated busbars are designated.
  • the transducer 5 has a predetermined impedance Z w, which corresponds to the design.
  • This impedance Z w and the output impedance of the matching networks 15 and 16 at the outputs 215 and 216 are matched to one another as usual.
  • the two comb structures 51 and 52 have a capacitive resistance.
  • a converter 3a according to FIG. 3 (or 3b according to FIG. 4) is used for the converters 3 and 4.
  • the converter 5 of Figure 2 and the converter 3a (or 3b) have basically the same design.
  • the geometric width and the aperture of the transducers 3a and 5 are the same.
  • the distribution of the fingers 53 and 54 or 53 and 54a is also the same within the respective path T of the individual transducer, this path T being the strip of the transducer within which acoustic waves are excited due to the signal feed of the transducer or its interlocking digital structures 51 and 52 or 51a and 52a occurs.
  • the width of the path T makes up approximately 95 to 99% of the distance a available between the busbars 55 and 56 in the interior of the converter.
  • the essential geometric or structural difference of the transducer of FIG. 3 on the one hand compared to the transducer of FIG. 2 on the other hand is that the fingers 54a are floating, i.e. floating, compared to the fingers 54. are not connected to any of the potentials mentioned above.
  • the fingers 53 and 54 are split fingers and they usually have a width b of lambda / 8.
  • the intermediate distance c between the split fingers 53, 54 has the same dimension.
  • These distances are entered in Figure 2. They are also entered accordingly in FIG. 3, although the respective finger 54a is a floating finger.
  • This floating finger in the transducer of FIG. 3 would not in itself be necessary for the piezoelectric generation of the surface wave. However, its presence serves uniformity. In particular, the presence of floating fingers 54a causes reflection in the transducer 3 is also suppressed, as is known to be the case for a split finger arrangement of the converter according to FIG. 2.
  • a converter of FIG. 3 has at least approximately an impedance 2 between its connections shown. Z w .
  • a converter 3a of FIG. 3 is provided as input signal converter 3 and 4 in the convolver of FIG. 1.
  • the parallel connection of two transducers 3a shows that the total input impedance for the input signal E is again Z w .
  • an adaptation network 15 must also be used on the input signal side.
  • three identical networks 15 can be used for the convolver according to the invention, although a converter structure of a principally uniform design can be used for the (input signal and reference signal) interdigital converters.
  • 1 provides the two convolution signals I and II from the input signal E and the reference signals R1 and R2, and yet the convolver 1 has interdigital converters, which are to be understood as coinciding in the sense of the invention.
  • the interdigital structure shown in FIG. 3, provided as an embodiment 3a for the input signal converters 3 and 4, has the individual ones, apart from the fingers 53 connected to the respective busbar 55, 56 floating finger 54a.
  • the alternative to the embodiment according to FIG. 3, improved embodiment according to FIG. 4, is based on the same principle on which the invention is based.
  • the converter designated by 3b in FIG. In embodiment 3b, however, the additional connecting bridges 254 are provided which electrically connect adjacent floating fingers 54a to one another.
  • Embodiments of such a transducer 3b can be such that all connecting fingers 54a of the transducer are electrically connected to one another by means of these connecting bridges.
  • the effect pursued within the scope of the invention can also be achieved at least largely by connecting only two adjacent fingers 54a to each other, namely that only the connecting bridges 254 shown with solid lines are present, for example. (The connecting bridges 254 shown in dashed lines are omitted for this embodiment).
  • An alternative embodiment would be to connect three or more adjacent floating fingers 54a with such connecting bridges 254, for example, or to connect a different number of adjacent floating fingers 54a to each other in a converter 3b.
  • the omissions designated 154 in FIG. 3 are naturally to be made somewhat larger, i.e. the width T 'is somewhat reduced compared to the dimension a, namely to make room for the connecting bridges 254.
  • this is not a problem within the scope of the invention.
  • FIG. 5 shows a further development of a convolver arrangement of FIG. 1.
  • FIG. 5 it is a convolver arrangement with four individual convolvers (instead of two convolvers of FIG. 1).
  • the convolver arrangement according to FIG. 5 serves to have at least largely no signal component based on self-folding in the output of the folding signals I and II.
  • the reference signal is fed into the two converters 5, 1 and 5, 2 or 2 connected in parallel 6, 1 and 6, 2 for the reference signals A and B in phase opposition.
  • the construction can be chosen so that the ent speaking opposite phase feed into the integration electrodes 8, 1 and 8, 2 or 7, 1 and 7, 2 takes place.
  • the result according to the invention is again achieved, namely that the input impedance for the input signal E in the convolver arrangement has the same input impedance as for the reference signals A and B. Also in the embodiment 5, the same matching network 115 can be used for the three signals E, A and B.

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  • Physics & Mathematics (AREA)
  • Mathematical Physics (AREA)
  • Engineering & Computer Science (AREA)
  • Theoretical Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Software Systems (AREA)
  • Computer Hardware Design (AREA)
  • General Physics & Mathematics (AREA)
  • Surface Acoustic Wave Elements And Circuit Networks Thereof (AREA)
EP86110765A 1985-08-21 1986-08-04 Dispositif de convolution à ondes acoustiques Withdrawn EP0212418A3 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3529902 1985-08-21
DE19853529902 DE3529902A1 (de) 1985-08-21 1985-08-21 Convolver-anordnung mit akustischen wellen

Publications (2)

Publication Number Publication Date
EP0212418A2 true EP0212418A2 (fr) 1987-03-04
EP0212418A3 EP0212418A3 (fr) 1990-01-17

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EP86110765A Withdrawn EP0212418A3 (fr) 1985-08-21 1986-08-04 Dispositif de convolution à ondes acoustiques

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US (1) US4799184A (fr)
EP (1) EP0212418A3 (fr)
JP (1) JPS6247207A (fr)
DE (1) DE3529902A1 (fr)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3729014A1 (de) * 1987-08-31 1989-03-09 Siemens Ag Oberflaechenwellenbauteil mit unterdrueckung unerwuenschter akustischer wellen
US4965480A (en) * 1988-01-12 1990-10-23 Canon Kabushiki Kaisha Surface acoustic wave convolver with two output electrodes of different lengths
JP2704196B2 (ja) * 1988-09-07 1998-01-26 国際電信電話 株式会社 ユニークワード検出器
US4952833A (en) * 1989-03-22 1990-08-28 Westinghouse Electric Corp. High density surface acoustic waveguide channelizer
JPH06188675A (ja) * 1992-12-18 1994-07-08 Canon Inc 弾性表面波コンボルバ
JPH11340774A (ja) * 1998-05-26 1999-12-10 Murata Mfg Co Ltd 弾性表面波フィルタ

Family Cites Families (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4575696A (en) * 1970-09-02 1986-03-11 Texas Instruments Incorporated Method for using interdigital surface wave transducer to generate unidirectionally propagating surface wave
US3816753A (en) * 1971-10-18 1974-06-11 Univ Leland Stanford Junior Parametric acoustic surface wave apparatus
US3770949A (en) * 1972-04-21 1973-11-06 Us Navy Acoustic surface wave correlators and convolvers
US3931509A (en) * 1974-03-11 1976-01-06 The Board Of Trustees Of Leland Stanford Jr. University Apparatus for obtaining the convolution and/or correlation of signals utilizing acoustic waves
US3935439A (en) * 1974-07-12 1976-01-27 Texas Instruments Incorporated Variable tap weight convolution filter
US4224683A (en) * 1978-08-25 1980-09-23 Rockwell International Corporation Multiple-channel acousto-electric convolver
US4207546A (en) * 1978-12-07 1980-06-10 United Technologies Corporation Phase and amplitude programmable internal mixing SAW signal processor
DE3267639D1 (en) * 1981-02-04 1986-01-09 Matsushita Electric Industrial Co Ltd Surface acoustic wave device
EP0104314A3 (fr) * 1982-09-07 1985-09-11 Siemens-Albis Aktiengesellschaft Filtre à ondes acoustiques de surface
DE3330034A1 (de) * 1983-08-19 1985-03-07 Siemens AG, 1000 Berlin und 8000 München Oberflaechenwellen-convolveranordnung
JPS62115A (ja) * 1985-02-25 1987-01-06 Oki Electric Ind Co Ltd 弾性表面波フイルタ
DE3520889C1 (de) * 1985-06-11 1990-03-08 SKF Textilmaschinen-Komponenten GmbH, 7000 Stuttgart Elektrische Antriebsvorrichtung, insbesondere für Textilmaschinen

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Publication number Publication date
JPS6247207A (ja) 1987-02-28
DE3529902A1 (de) 1987-02-26
EP0212418A3 (fr) 1990-01-17
US4799184A (en) 1989-01-17

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