1、 IEC 60862-2 Edition 3.0 2012-05 INTERNATIONAL STANDARD NORME INTERNATIONALE Surface acoustic wave (SAW) filters of assessed quality Part 2: Guidelines for the use Filtres ondes acoustiques de surface (OAS) sous assurance de la qualit Partie 2: Lignes directrices dutilisation IEC 60862-2:2012 colour
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16、ANDARD NORME INTERNATIONALE Surface acoustic wave (SAW) filters of assessed quality Part 2: Guidelines for the use Filtres ondes acoustiques de surface (OAS) sous assurance de la qualit Partie 2: Lignes directrices dutilisation INTERNATIONAL ELECTROTECHNICAL COMMISSION COMMISSION ELECTROTECHNIQUE IN
17、TERNATIONALE XB ICS 31.140 PRICE CODE CODE PRIX ISBN 978-2-88912-074-1 Registered trademark of the International Electrotechnical Commission Marque dpose de la Commission Electrotechnique Internationale Warning! Make sure that you obtained this publication from an authorized distributor. Attention!
18、Veuillez vous assurer que vous avez obtenu cette publication via un distributeur agr. colour inside 2 60862-2 IEC:2012 CONTENTS FOREWORD . 5 INTRODUCTION . 7 1 Scope . 8 2 Normative references . 8 3 Technical considerations 8 4 Fundamentals of SAW transversal filters 9 4.1 Frequency response charact
19、eristics 9 4.2 Weighting methods 10 4.3 Filter configurations 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 r
20、esonator filters . 30 5.1 Classification of SAW resonator 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 couple
21、d type . 36 5.3.3 Longitudinally coupled type . 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
22、guidelines . 46 6.1 Substrate materials and 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
23、condition 57 7.4 Miscellaneous . 57 7.4.1 Soldering conditions 57 7.4.2 Static electricity . 57 8 Ordering procedure 58 60862-2 IEC:2012 3 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 fi
24、lters . 11 Figure 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 f 0is the centre frequency and N is the number of finger pairs of
25、 the IDT . 12 Figure 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
26、a SAW IF 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
27、 SAW filter 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
28、 transducers . 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 configur
29、ation . 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 fil
30、ter 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 Equivalent circuit
31、 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 4 60862-2 IEC:2012 Figure 36 SAW energy distribution and equivalent circu
32、it 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 characteristics of a longitudinally coupled resonat
33、or 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 resonator filter . 43 Figure 43 Typical chara
34、cteristics 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 losses for various substrates 48 Figure 47 Relationship
35、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 signal: f = 1/(2t) for the TTE, and f = 1/t for the feed-th
36、rough, 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 Properties of typical single-crystal substrate materials 50 Table 2 Pr
37、operties of typical thin-film substrate materials 50 Table 3 Properties of typical ceramic substrate materials . 50 60862-2 IEC:2012 5 INTERNATIONAL ELECTROTECHNICAL COMMISSION _ SURFACE ACOUSTIC WAVE (SAW) FILTERS OF ASSESSED QUALITY Part 2: Guidelines for the use FOREWORD 1) The International Elec
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47、this IEC Publication or any other IEC Publications. 8) Attention is drawn to the Normative references cited in this publication. Use of the referenced publications is indispensable for the correct application of this publication. 9) Attention is drawn to the possibility that some of the elements of
48、this IEC Publication may be the subject of patent rights. IEC shall not be held responsible for identifying any or all such patent rights. International Standard IEC 60862-2 has been prepared by IEC technical committee 49: Piezoelectric, dielectric and electrostatic devices and associated materials
49、for frequency control, selection and detection. This third edition cancels and replaces the second edition published in 2002 and constitutes a technical revision. This edition includes the following significant technical changes with respect to the previous edition: Clause 3-“Terms and definitions“ has been deleted to be included in the next edition of
