1、raising standards worldwideNO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWBSI Standards PublicationSurface acoustic wave (SAW) filters of assessed qualityPart 2: Guidelines for the useBS EN 60862-2:2012National forewordThis British Standard is the UK implementation of EN 60862
2、-2:2012. It is identical to IEC 60862-2:2012. It supersedes BS EN 60862-2:2002,which is withdrawn.The UK participation in its preparation was entrusted to Technical Committee EPL/49, Piezoelectric devices for frequency control and selection.A list of organizations represented on this committee can b
3、e obtained on request to its secretary.This publication does not purport to include all the necessary provisions of a contract. Users are responsible for its correct application. The British Standards Institution 2012Published by BSI Standards Limited 2012 ISBN 978 0 580 66988 0 ICS 31.160Compliance
4、 with a British Standard cannot confer immunity from legal obligations.This British Standard was published under the authority of the Standards Policy and Strategy Committee on 31 August 2012.Amendments issued since publicationAmd. No. Date Text affectedBRITISH STANDARDBS EN 60862-2:2012EUROPEAN STA
5、NDARD EN 60862-2 NORME EUROPENNE EUROPISCHE NORM August 2012 CENELEC European Committee for Electrotechnical Standardization Comit Europen de Normalisation Electrotechnique Europisches Komitee fr Elektrotechnische Normung Management Centre: Avenue Marnix 17, B - 1000 Brussels 2012 CENELEC - All righ
6、ts of exploitation in any form and by any means reserved worldwide for CENELEC members. Ref. No. EN 60862-2:2012 E ICS 31.140 Supersedes EN 60862-2:2002English version Surface acoustic wave (SAW) filters of assessed quality - Part 2: Guidelines for the use (IEC 60862-2:2012) Filtres ondes acoustique
7、s de surface (OAS) sous assurance de la qualit - Partie 2: lignes directrices dutilisation (CEI 60862-2:2012) Oberflchenwellenfilter (OFW-Filter) mit bewerteter Qualitt - Teil 2: Leitfaden fr die Anwendung (IEC 60862-2:2012) This European Standard was approved by CENELEC on 2012-06-11. CENELEC membe
8、rs are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such national standards may be obtained on applicatio
9、n to the CEN-CENELEC Management Centre or to any CENELEC member. This European Standard exists in three official versions (English, French, German). A version in any other language made by translation under the responsibility of a CENELEC member into its own language and notified to the CEN-CENELEC
10、Management Centre has the same status as the official versions. CENELEC members are the national electrotechnical committees of Austria, Belgium, Bulgaria, Croatia, Cyprus, the Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland
11、, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, the Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United Kingdom. BS EN 60862-2:2012EN 60862-2:2012 Foreword The text of document 49/933/CDV, future edition 3 of IEC 60862-2, prep
12、ared by IEC/TC 49 “Piezoelectric, dielectric and electrostatic devices and associated materials for frequency control, selection and detection“ was submitted to the IEC-CENELEC parallel vote and approved by CENELEC as EN 60862-2:2012. The following dates are fixed: latest date by which the document
13、has to be implemented at national level by publication of an identical national standard or by endorsement (dop) 2013-03-11 latest date by which the national standards conflicting with the document have to be withdrawn (dow) 2015-06-11 This document supersedes EN 60862-2:2002. EN 60862-2:2012 includ
14、es the following significant technical changes with respect to EN 60862-2:2002: - Clause 3 “Terms and definitions” has been deleted to be included in the next edition of EN 60862-1; - the tapered IDT filter and the RSPUDT filter have been added to the clause of SAW transversal filters. Also DART, DW
15、SF and EWC have been added as variations of SPUDT; - the balanced connection has been added to the subclause of coupled resonator filters; - recent substrate materials have been described; - a subclause about packaging of SAW filters has been added. Attention is drawn to the possibility that some of
16、 the elements of this document may be the subject of patent rights. CENELEC and/or CEN shall not be held responsible for identifying any or all such patent rights. Endorsement notice The text of the International Standard IEC 60862-2:2012 was approved by CENELEC as a European Standard without any mo
17、dification. In the official version, for Bibliography, the following notes have to be added for the standards indicated: IEC 60862 Series NOTE Harmonised as EN 60862 Series (not modified). IEC 60862-1:2003 NOTE Harmonised as EN 60862-1:2003 (not modified). IEC 61019-2:2005 NOTE Harmonised as EN 6101
18、9-2:2005 (not modified). BS EN 60862-2:201260862-2 IEC:2012 CONTENTS INTRODUCTION . 7 1 Scope . . 8 2 Normative references . 8 3 Technical considerations 8 4 Fundamentals of SAW transversal filters . 9 4.1 Frequency response characteristics . . 9 4.2 Weighting methods . 10 4.3 Filter configurations
19、and their general characteristics . 13 4.3.1 General . 13 4.3.2 Bidirectional IDT filters . 14 4.3.3 Unidirectional IDT (UDT) filters 15 4.3.4 Tapered IDT filters . 22 4.3.5 Reflector filters . 23 4.3.6 RSPUDT filters . 27 5 Fundamentals of SAW resonator filters 30 5.1 Classification of SAW resonato
20、r filters . 30 5.2 Ladder and lattice filters . . 30 5.2.1 Basic structure . 30 5.2.2 Principle of operation . . 31 5.2.3 Characteristics of ladder and lattice filters . . 32 5.3 Coupled resonator filters . 35 5.3.1 General . 35 5.3.2 Transversely coupled type . 36 5.3.3 Longitudinally coupled type
21、. 36 5.3.4 Other characteristics of coupled resonator filters . 36 5.3.5 Balanced connection . . 41 5.4 Interdigitated interdigital transducer (lIDT) resonator filters . 45 5.4.1 Configuration 45 5.4.2 Principle 45 5.4.3 Characteristics . 45 6 Application guidelines . 46 6.1 Substrate materials and
22、their characteristics . 46 6.2 Application to electronics circuits 50 6.3 Availability and limitations . 52 6.4 Input levels . 53 6.5 Packaging of SAW filters . 54 7 Practical remarks. 56 7.1 General . . 56 7.2 Feed-through signals 56 7.3 Impedance matching condition . 57 7.4 Miscellaneous . 57 7.4.
23、1 Soldering conditions 57 7.4.2 Static electricity . 57 8 Ordering procedure . . 58 BS EN 60862-2:201260862-2 IEC:2012 Bibliography . 61 Figure 1 Frequency response of a SAW filter . 10 Figure 2 Applicable range of frequency and relative bandwidth of the SAW filter and the other filters . 11 Figure
24、3 Schematic diagram showing signal flow through a transversal filter 11 Figure 4 Basic configuration of a SAW transversal filter . 12 Figure 5 Frequency response of the SAW transversal filter shown in Figure 4, where f0is the centre frequency and N is the number of finger pairs of the IDT . . 12 Fig
25、ure 6 Apodization weighting obtained by apodizing fingers . 13 Figure 7 Withdrawal weighting obtained by selective withdrawal of the fingers . 13 Figure 8 Series weighting obtained by the dog-leg structure . 13 Figure 9 Split-finger configuration . . 14 Figure 10 Typical characteristics of a SAW IF
26、filter for radio transmission equipment (nominal frequency of 70,0 MHz) . 17 Figure 11 Typical characteristics of a frequency asymmetrical SAW filter (nominal frequency of 58,75 MHz for TV-IF use) . 17 Figure 12 SAW three-IDT filter 18 Figure 13 Typical frequency response of a 900 MHz range SAW filt
27、er for communication (mobile telephone use) . . 18 Figure 14 Schematic of the IIDT (multi-IDT) filter . 19 Figure 15 Multi-phase unidirectional transducer . . 19 Figure 16 Single-phase unidirectional transducers 20 Figure 17 Frequency characteristics of a filter using multi-phase unidirectional tran
28、sducers 21 Figure 18 Frequency characteristics of a filter using single-phase unidirectional transducers .21 Figure 19 Tapered IDT filter . . 22 Figure 20 Frequency response of a 140 MHz tapered IDT filter . . 22 Figure 21 Various reflector filter configurations 24 Figure 22 Z-path filter configurat
29、ion . 25 Figure 23 Dual-track reflector filter configuration . 25 Figure 24 SPUDT-based dual-track filter . 26 Figure 25 Frequency characteristics of Z-path filter . 26 Figure 26 Frequency characteristics of dual-track reflector filter. 27 Figure 27 Frequency characteristics of SPUDT-based reflector
30、 filter . 27 Figure 28 A part of DART electrode in RSPUDT filter . 28 Figure 29 Distribution of internal reflection and detection inside RSPUDT filter . 28 Figure 30 Frequency and time responses of a 456 MHz RSPUDT filter . 29 Figure 31 Structure of ladder and lattice filters . 32 Figure 32 Equivale
31、nt circuit of basic section of ladder and lattice filter . . 33 Figure 33 Pattern layout of ladder filter . 33 Figure 34 Basic concept of ladder and lattice filter 34 Figure 35 Typical characteristics of a 1,5 GHz range ladder filter . 35 BS EN 60862-2:201260862-2 IEC:2012 Figure 36 SAW energy distr
32、ibution and equivalent circuit of transversely coupled resonator filter . . 37 Figure 37 Typical characteristics of a transversely coupled resonator filter . . 38 Figure 38 Basic configuration and SAW energy distribution of longitudinally coupled resonator filter . . 39 Figure 39 Typical characteris
33、tics of a longitudinally coupled resonator filter . 40 Figure 40 Configuration of balanced type transversely coupled resonator filter . 41 Figure 41 Frequency characteristics of balanced type transversely coupled resonator filter . . 42 Figure 42 Configuration of balanced type longitudinally coupled
34、 resonator filter . . 43 Figure 43 Typical characteristics of a balanced type longitudinally coupled resonator filter . . 45 Figure 44 Schematic of IIDT resonator filter . 46 Figure 45 Frequency characteristics of a 820 MHz range IIDT resonator filter 46 Figure 46 Minimum theoretical conversion loss
35、es for various substrates . 48 Figure 47 Relationship between relative bandwidth and insertion attenuation for various SAW filters, with the practical SAW filters bandwidth for their typical applications . 52 Figure 48 Ripples in the characteristics of a SAW filter caused by TTE or feed-through sign
36、al: f = 1/(2t) for the TTE, and f = 1/t for the feed-through, where t is the delay of the SAW main signal . . 53 Figure 49 Example of SAW metal package . 54 Figure 50 Example of SAW ceramic package . 55 Figure 51 Example of SAW resin package . 55 Figure 52 Example of SAW CSP . . 56 Table 1 Propertie
37、s of typical single-crystal substrate materials . . 50 Table 2 Properties of typical thin-film substrate materials . 50 Table 3 Properties of typical ceramic substrate materials . 50 BS EN 60862-2:201260862-2 IEC:2012 7 INTRODUCTION This standard has been compiled in response to a generally expresse
38、d desire on the part of both users and manufacturers for guidance on the use of SAW filters, so that the filters may be used to their best advantage. To this end, general and fundamental characteristics have been explained here. The features of these SAW filters are their small size, light weight, a
39、djustment-free, high stability and high reliability. SAW filters add new features and applications to the field of crystal filters and ceramic filters. At the beginning, SAW filters meant transversal filters which have two interdigital transducers (IDT). Although SAW transversal filters have a relat
40、ively higher minimum insertion attenuation, they have excellent amplitude and phase characteristics. Extensive studies have been made to reduce minimum insertion attenuation, such as resonator filter configurations, unidirectional interdigital transducers (UDT), interdigitated interdigital transduce
41、rs (IIDT). Nowadays, various kinds of SAW filters with low insertion attenuation are widely used in various applications and SAW filters are available in the gigahertz range. BS EN 60862-2:2012 8 60862-2 IEC:2012 SURFACE ACOUSTIC WAVE (SAW) FILTERS OF ASSESSED QUALITY Part 2: Guidelines for the use
42、1 Scope This part of IEC 60862 gives practical guidance on the use of SAW filters which are used in telecommunications, measuring equipment, radar systems and consumer products. IEC 60862-1 should be referred to for general information, standard values and test conditions. SAW filters are now widely
43、 used in a variety of applications such as TV, satellite communications, optical fibre communications, mobile communications and so on. While these SAW filters have various specifications, many of them can be classified within a few fundamental categories. This part of IEC 60862 includes various kin
44、ds of filter configuration, of which the operating frequency range is from approximately 10 MHz to 3 GHz and the relative bandwidth is about 0,02 % to 50 % of the centre frequency. It is not the aim of this standard to explain theory, nor to attempt to cover all the eventualities which may arise in
45、practical circumstances. This standard draws attention to some of the more fundamental questions, which should be considered by the user before he places an order for a SAW filter for a new application. Such a procedure will be the users insurance against unsatisfactory performance. Standard specifi
46、cations, given in IEC 60862 series, and national specifications or detail specifications issued by manufacturers, define the available combinations of nominal frequency, pass bandwidth, ripple, shape factor, terminating impedance, etc. These specifications are compiled to include a wide range of SAW
47、 filters with standardized performances. It cannot be over-emphasized that the user should, wherever possible, select his SAW filters from these specifications, when available, even if it may lead to making small modifications to his circuit to enable standard filters to be used. This applies partic
48、ularly to the selection of the nominal frequency. 2 Normative references The following documents, in whole or in part, are normatively referenced in this document and are indispensable for its application. For dated references, only the edition cited applies. For undated references, the latest editi
49、on of the referenced document (including any amendments) applies. None. 3 Technical considerations It is of prime interest to a user that the filter characteristics should satisfy a particular speci-fication. The selection of tuning networks and SAW filters to meet that specification should be a matter of agreement between the user and the manufacturer. BS EN 60862-2:201260862-2 IEC:2012 9 Filter characteristics are
