1、 IEC 62575-2 Edition 1.0 2012-07 INTERNATIONAL STANDARD NORME INTERNATIONALE Radio frequency (RF) bulk acoustic wave (BAW) filters of assessed quality Part 2: Guidelines for the use Filtres radiofrquences (RF) ondes acoustiques de volume (OAV) sous assurance de la qualit Partie 2: Lignes directrices
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16、 1.0 2012-07 INTERNATIONAL STANDARD NORME INTERNATIONALE Radio frequency (RF) bulk acoustic wave (BAW) filters of assessed quality Part 2: Guidelines for the use Filtres radiofrquences (RF) ondes acoustiques de volume (OAV) sous assurance de la qualit Partie 2: Lignes directrices demploi INTERNATION
17、AL ELECTROTECHNICAL COMMISSION COMMISSION ELECTROTECHNIQUE INTERNATIONALE T ICS 31.140 PRICE CODE CODE PRIX ISBN 978-2-83220-248-7 Registered trademark of the International Electrotechnical Commission Marque dpose de la Commission Electrotechnique Internationale Warning! Make sure that you obtained
18、this publication from an authorized distributor. Attention! Veuillez vous assurer que vous avez obtenu cette publication via un distributeur agr. colourinside 2 62575-2 IEC:2012 CONTENTS FOREWORD . 3 INTRODUCTION . 5 1 Scope . 6 2 Normative references . 6 3 Technical considerations 6 4 Fundamentals
19、of RF BAW filters . 7 4.1 General . 7 4.2 Fundamentals of RF BAW resonators 8 4.3 RF resonator structures . 13 4.4 Ladder filters . 15 4.4.1 Basic structure 15 4.4.2 Principle of operation . 16 4.4.3 Characteristics of ladder filters 17 5 Application guide 18 5.1 Application to electronics circuits.
20、 18 5.2 Availability and limitations . 18 5.3 Input levels 18 6 Practical remarks 18 6.1 General . 18 6.2 Feed-through signals . 19 6.3 Load and source impedance conditions . 19 7 Miscellaneous 19 7.1 Soldering conditions 19 7.2 Static electricity . 19 8 Ordering procedure 19 Bibliography 22 Figure
21、1 Frequency response of a RF BAW filter 7 Figure 2 Applicable range of frequency and relative bandwidth of the RF BAW filter and the other filters . 8 Figure 3 Basic BAW resonator structure. 9 Figure 4 BVD model . 9 Figure 5 Typical impedance characteristics 10 Figure 6 Typical impedance characteris
22、tics of RF BAW devices . 12 Figure 7 Modified BVD model. 13 Figure 8 FBAR structures . 14 Figure 9 SMR structure 15 Figure 10 Structure of ladder filter . 15 Figure 11 Equivalent circuit of basic section of ladder filter 16 Figure 12 Basic concept of ladder filter 16 Figure 13 Typical characteristic
23、s of a 1,9 GHz range ladder filter . 17 62575-2 IEC:2012 3 INTERNATIONAL ELECTROTECHNICAL COMMISSION _ RADIO FREQUENCY (RF) BULK ACOUSTIC WAVE (BAW) FILTERS OF ASSESSED QUALITY Part 2: Guidelines for the use FOREWORD 1) The International Electrotechnical Commission (IEC) is a worldwide organization
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33、ntion 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 this IEC Publication may be the subject of patent rights. I
34、EC shall not be held responsible for identifying any or all such patent rights. International Standard IEC 62575-2 has been prepared by IEC technical committee 49: Piezoelectric, dielectric and electrostatic devices and associated materials for frequency control, selection and detection. The text of
35、 this standard is based on the following documents: FDIS Report on voting 49/994/FDIS 49/999/RVD Full information on the voting for the approval of this standard can be found in the report on voting indicated in the above table. This publication has been drafted in accordance with the ISO/IEC Direct
36、ives, Part 2. 4 62575-2 IEC:2012 A list of all the parts in the IEC 62575 series, published under the general title Radio frequency (RF) Bulk acoustic wave (BAW) filters of assessed quality, can be found on the IEC website. The committee has decided that the contents of this publication will remain
37、unchanged until the stability date indicated on the IEC web site under “http:/webstore.iec.ch“ in the data related to the specific publication. At this date, the publication will be reconfirmed, withdrawn, replaced by a revised edition, or amended. IMPORTANT The colour inside logo on the cover page
38、of this publication indicates that it contains colours which are considered to be useful for the correct understanding of its contents. Users should therefore print this document using a colour printer. 62575-2 IEC:2012 5 INTRODUCTION RF BAW filters are now widely used in mobile communications. Whil
39、e the RF BAW filters have various specifications, many of them can be classified within a few fundamental categories. Standard specifications, given in IEC 62575, and national specifications or detail specifi-cations issued by manufacturers, define the available combinations of nominal frequency, pa
40、ss bandwidth, ripple, shape factor, terminating impedance, etc. These specifications are compiled to include a wide range of RF BAW filters with standardized performances. It cannot be over-emphasized that the user should, wherever possible, select his RF BAW filters from these specifications, when
41、available, even if it may lead to making small modifications to his circuit to enable standard filters to be used. This applies particularly to the selection of the nominal frequency. This standard has been compiled in response to a generally expressed desire on the part of both users and manufactur
42、ers for guidance on the use of RF BAW filters, so that the filters may be used to their best advantage. To this end, general and fundamental characteristics have been explained in this part of IEC 62575. It is not the aim of this standard to explain theory, nor to attempt to cover all the eventualit
43、ies which may arise in 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 an RF BAW filter for a new application. Such a procedure will be the users insurance against unsatisfactory pe
44、rformance. 6 62575-2 IEC:2012 RADIO FREQUENCY (RF) BULK ACOUSTIC WAVE (BAW) FILTERS OF ASSESSED QUALITY Part 2: Guidelines for the use 1 Scope This part of IEC 62575 gives practical guidance on the use of RF BAW filters which are used in telecommunications, measuring equipment, radar systems and con
45、sumer products. General information, standard values and test conditions will be provided in a future IEC standard1. This part of IEC 62575 includes various kinds of filter configurations, of which the operating frequency range is from approximately 500 MHz to 10 GHz and the relative bandwidth is ab
46、out 1 % to 5 % of the centre 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 edition of the
47、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 specification. The selection of tuning networks and RF BAW filters to meet that specification should be a matter of a
48、greement between user and manufacturer. Filter characteristics are usually expressed in terms of insertion attenuation as a function of frequency, as shown in Figure 1. A standard method for measuring insertion attenuation is described in IEC 60862-1:2003, 5.5.2. Insertion attenuation characteristic
49、s are further specified by nominal frequency, minimum insertion attenuation or maximum insertion attenuation, pass-band ripple and shape factor. The specification is to be satisfied between the lowest and highest temperatures of the specified operating temperature range and before and after environmental tests. _ 1This standard (under consideration) is expected to bear the reference number IEC 62575-1. 62575-2
