1、raising standards worldwideNO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWBSI Standards PublicationPiezoelectric, dielectric and electrostatic devices and associated materials for frequency control, selection and detection Glossary Part 2: Piezoelectric and dielectric filtersD
2、D IEC/TS 61994-2:2011National forewordThis Draft for Development is the UK implementation of IEC/TS 61994-2:2011.The UK participation in its preparation was entrusted to Technical CommitteeEPL/49, Piezoelectric devices for frequency control and selection.A list of organizations represented on this c
3、ommittee can be obtained onrequest to its secretary.This publication does not purport to include all the necessary provisions of acontract. Users are responsible for its correct application. BSI 2011ISBN 978 0 580 67222 4ICS 01.040.31; 31.140Compliance with a British Standard cannot confer immunity
4、fromlegal obligations.This Draft for Development was published under the authority of theStandards Policy and Strategy Committee on 31 July 2011.Amendments issued since publicationAmd. No. Date Text affectedDRAFT FOR DEVELOPMENTDD IEC/TS 61994-2:2011IEC/TS 61994-2 Edition 2.0 2011-06 TECHNICAL SPECI
5、FICATION SPCIFICATION TECHNIQUE Piezoelectric, dielectric and electrostatic devices and associated materials for frequency control, selection and detection Glossary Part 2: Piezoelectric and dielectric filters Dispositifs pizolectriques, dilectriques et lectrostatiques et matriaux associs pour la co
6、mmande, le choix et la dtection de la frquence Glossaire Partie 2: Filtres pizolectriques et dilectriques INTERNATIONAL ELECTROTECHNICAL COMMISSION COMMISSION ELECTROTECHNIQUE INTERNATIONALE R ICS 31.140; 01.040.31 PRICE CODE CODE PRIX ISBN 978-2-88912-535-7 Registered trademark of the International
7、 Electrotechnical Commission Marque dpose de la Commission Electrotechnique Internationale DD IEC/TS 61994-2:2011 2 TS 61994-2 IEC:2011 CONTENTS FOREWORD . 3 1 Scope . 5 2 Normative references . 5 3 Terms and definitions . 5 Figure 1 Apodized IDT . 6 Figure 2 Configuration of an interdigital transdu
8、cer for dispersive filter 7 Figure 3 Interdigited interdigital transducer (IIDT) 9 Figure 4 Frequency response of Insertion attenuation of a filter . 10 Figure 5 Configuration of a ladder filter 10 Figure 6 Configuration of a lattice filter 11 Figure 7 Multiphase transducer (unidirectional transduce
9、r) 12 Figure 8 Configuration of a resonator filter . 15 Figure 9 Transversal filter 18 DD IEC/TS 61994-2:2011TS 61994-2 IEC:2011 3 INTERNATIONAL ELECTROTECHNICAL COMMISSION _ PIEZOELECTRIC, DIELECTRIC AND ELECTROSTATIC DEVICES AND ASSOCIATED MATERIALS FOR FREQUENCY CONTROL, SELECTION AND DETECTION G
10、LOSSARY Part 2: Piezoelectric and dielectric filters FOREWORD 1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising all national electrotechnical committees (IEC National Committees). The object of IEC is to promote international co-operati
11、on on all questions concerning standardization in the electrical and electronic fields. To this end and in addition to other activities, IEC publishes International Standards, Technical Specifications, Technical Reports, Publicly Available Specifications (PAS) and Guides (hereafter referred to as “I
12、EC Publication(s)”). Their preparation is entrusted to technical committees; any IEC National Committee interested in the subject dealt with may participate in this preparatory work. International, governmental and non-governmental organizations liaising with the IEC also participate in this prepara
13、tion. IEC collaborates closely with the International Organization for Standardization (ISO) in accordance with conditions determined by agreement between the two organizations. 2) The formal decisions or agreements of IEC on technical matters express, as nearly as possible, an international consens
14、us of opinion on the relevant subjects since each technical committee has representation from all interested IEC National Committees. 3) IEC Publications have the form of recommendations for international use and are accepted by IEC National Committees in that sense. While all reasonable efforts are
15、 made to ensure that the technical content of IEC Publications is accurate, IEC cannot be held responsible for the way in which they are used or for any misinterpretation by any end user. 4) In order to promote international uniformity, IEC National Committees undertake to apply IEC Publications tra
16、nsparently to the maximum extent possible in their national and regional publications. Any divergence between any IEC Publication and the corresponding national or regional publication shall be clearly indicated in the latter. 5) IEC itself does not provide any attestation of conformity. Independent
17、 certification bodies provide conformity assessment services and, in some areas, access to IEC marks of conformity. IEC is not responsible for any services carried out by independent certification bodies. 6) All users should ensure that they have the latest edition of this publication. 7) No liabili
18、ty shall attach to IEC or its directors, employees, servants or agents including individual experts and members of its technical committees and IEC National Committees for any personal injury, property damage or other damage of any nature whatsoever, whether direct or indirect, or for costs (includi
19、ng legal fees) and expenses arising out of the publication, use of, or reliance upon, 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 th
20、is publication. 9) Attention is drawn to the possibility that some of the elements of this IEC Publication may be the subject of patent rights. IEC shall not be held responsible for identifying any or all such patent rights. The main task of IEC technical committees is to prepare International Stand
21、ards. In exceptional circumstances, a technical committee may propose the publication of a technical specification when the required support cannot be obtained for the publication of an International Standard, despite repeated efforts, or the subject is still under technical development or where, fo
22、r any other reason, there is the future but no immediate possibility of an agreement on an International Standard. Technical specifications are subject to review within three years of publication to decide whether they can be transformed into International Standards. DD IEC/TS 61994-2:2011 4 TS 6199
23、4-2 IEC:2011 IEC 61994-2, which is a technical specification, has been prepared by IEC technical committee 49: Piezoelectric, dielectric and electrostatic devices and associated materials for frequency control, selection and detection. This second edition of IEC 61994-2 cancels and replaces the firs
24、t edition published in 2000 This edition constitutes a technical revision. The main changes with respect to the previous edition are listed below: definitions updated, terminology given in orderly sequence, new terminologies are added, drawings inserted for easier understanding. The text of this tec
25、hnical specification is based on the following documents: Enquiry draft Report on voting 49/922/DTS 49/931/RVC Full information on the voting for the approval of this technical specification can be found in the report on voting indicated in the above table. This publication has been drafted in accor
26、dance with the IS0/lEC Directives, Part 2. A list of all parts of IEC 61994 series under the general title1: Piezoelectric, dielectric and electrostatic devices and associated materials for frequency control, selection and detection Glossary, can be found on the IEC website. NOTE Future standards in
27、 this series will carry the new general title as cited above. Titles of existing standards in this series will be updated at the time of next edition. The committee has decided that the contents of this publication will remain unchanged until the stability date indicated on the IEC web site under “h
28、ttp:/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. _ 1The general title is changed from Piezoelectric and dielectric devices for frequency control and selection Glossary: to t
29、his title based on the change of the title of TC49 in 2009. DD IEC/TS 61994-2:2011TS 61994-2 IEC:2011 5 PIEZOELECTRIC, DIELECTRIC AND ELECTROSTATIC DEVICES AND ASSOCIATED MATERIALS FOR FREQUENCY CONTROL, SELECTION AND DETECTION GLOSSARY Part 2: Piezoelectric and dielectric filters 1 Scope This part
30、of IEC 61994 is a technical specification that gives the terms and definitions for piezoelectric and dielectric filters representing the present state of the art, which are intended for use in the standards and documents of IEC technical committee 49. 2 Normative references The following referenced
31、documents are indispensable for the application of this document. For dated references, only the edition cited applied. For undated references, the latest edition of the referenced document (including any amendments) applies. IEC 60050(561):1991, International Electrotechnical Vocabulary (IEV) Chapt
32、er 561: Piezoelectric devices for frequency control and selection IEC 60368-1:2000, Piezoelectric filters of assessed quality Part 1: Generic specification IEC 60368-2-2:1996, Piezoelectric filters Part 2: Guide to the use of piezoelectric filters Section 2: Piezoelectric ceramic filters IEC 60862-1
33、:2003, Surface acoustic wave (SAW) filters of assessed quality Part 1: Generic specification IEC 60862-2:2002, Surface acoustic wave (SAW) filters of assessed quality Part 2: Guidance on use IEC 61261-1:1994, Piezoelectric ceramic filters for use in electronic equipment A specification in the IEC qu
34、ality assessment system for electronic components (IECQ) Part 1: Generic specification Qualification approval IEC 61337-1:2004, Filters using waveguide type dielectric resonators Part 1: Generic specification 3 Terms and definitions For the purposes of this document, the following terms and definiti
35、ons given in IEC 60050-561 as well as the followings apply. 3.1 apodisation (of an interdigital transducer) IDT weighting produced by the change of finger overlap over the length of the IDT NOTE An apodization of IDT is shown in Figure 1. DD IEC/TS 61994-2:2011 6 TS 61994-2 IEC:2011 IEC 60862-2: 200
36、2, 3.1.18 IEC 1199/11 Figure 1 Apodized IDT 3.2 available power maximum power obtainable from a given source by suitable adjustment of the load impedance IEC 60862-1:2003, 2.2.2.35 3.3 band-pass filter filter having a single pass band between two specified stop bands 3.4 band-stop filter filter havi
37、ng a single stop band between two specified pass band 3.5 centre frequency arithmetic mean of the cut-off frequencies IEC 60862-1: 2003, 2.2.2.2 3.6 comb filter filter having two or more pass-bands between three or more stop-bands IEC 60862-2 :2002, 3.3.5 3.7 coupling factor for dielectric filters,
38、k degree of coupling between two resonators. The coupling between dielectric resonators is mainly made either magnetically or electrically. According to each case, the equivalent circuit of coupling is expressed by inductive or capacitive coupling, respectively. The coupling factor by inductive or c
39、apacitive coupling is defined by the following equations respectively: k = M /21LL k = Cm/ 21CC where L1, C1and L2, C2are the resonance circuit elements; M is the mutual inductance; Cmis the coupling capacitance; k is the coupling factor. DD IEC/TS 61994-2:2011TS 61994-2 IEC:2011 7 In the case of a
40、symmetric circuit of coupling, the coupling factor can be obtained from two resonance frequencies calculated or measured for the coupled resonators: k = ( f02 fe2 ) / (f02+ fe2) where feis the resonance frequency in the case of even mode excitation (open-circuited symmetric plane); f0is the resonanc
41、e frequency in the case of odd mode excitation (short-circuited symmetric plane). The coupling factor of a band-stop filter is the degree of coupling between the resonator and the transmission line. The coupling factor k is defined as the ratio of the external power loss (Pe) of the resonator system
42、 to the internal power loss (Pu) of the resonator and can be expressed by a function of quality factor as follows: k = Pe/Pu= Qu/Qe= Qu/QL 1 where Quis the unloaded quality factor of resonator; Qeis the external quality factor of resonator; QLis the loaded quality factor of resonator. IEC 61337-1: 2
43、004, 2.2.6, modified 3.8 cut-off frequency frequency of the pass band at which the relative attenuation of a piezoelectric filter reaches a specified value NOTE See Figure 4. 3.9 dispersive filter filter designed so as to have group delay which is a function of frequency, usually by varying the fing
44、er periodicity NOTE An interdigital transducer for a dispersive filter is shown in Figure 2. IEC 60862-2: 2002, 3.3.4 l2l1l1 l2IEC 1200/11 Figure 2 Configuration of an interdigital transducer for dispersive filter 3.10 distortion of envelope delay time (in an electrical network) unwanted variation o
45、f the envelope delay time of a signal in an electrical network as a function of frequency DD IEC/TS 61994-2:2011 8 TS 61994-2 IEC:2011 3.11 envelope delay time time of propagation of a certain characteristic of a signal envelope between two points, for a certain frequency 3.12 feedthrough signals (s
46、ignals of electromagnetic interference) unwanted signals from the input appearing at the filter output due to stray capacitances and other electromagnetic couplings IEC 60862-1: 2003, 2.2.1.29 3.13 feedthrough signal suppression relative attenuation which implies the suppression of directly coupled
47、signals by the electromagnetic and electrostatic coupling between the input and output electrodes IEC 60862-1: 2003, 2.2.2.27 3.14 fractional bandwidth (of a band-pass filter) ratio of the pass bandwidth to the mid-band frequency in the case of band-pass filter IEC 61337-1: 2004, 2.2.14, modified 3.
48、15 fractional bandwidth (of a band-stop filter) ratio of the stop bandwidth to the mid-band frequency in the case of band-stop filter IEC 61337-1: 2004, 2.2.14, modified 3.16 frequency asymmetrical filter filter having a specified asymmetrical pass-band or stop-band characteristic in relation to the
49、 reference frequency IEC 60862-1: 2003, 2.2.3.3 3.17 frequency symmetrical filter filter having a symmetrical frequency characteristic in relation to the reference frequency IEC 60862-1: 2003, 2.2.3.2 3.18 group delay time equal to the first derivative of the phase shift, in radians, between these points with respect to the angular frequency IEC 60862-1: 2003, 2.2.2.18 3.19 grou
