Piezoelectric and dielectric devices for frequency control and selection - Glossary - Part 1: Piezoelectric and dielectric resonators

Gives the terms and definitions for piezoelectric and dielectric resonators representing the present state-of-the-art, which are intended for use in the standards and documents of IEC TC 49. This new edition takes into account new editions of IEC TC 49 publications.

General Information

Status
Published
Publication Date
29-Aug-2007
Current Stage
PPUB - Publication issued
Start Date
30-Aug-2007
Completion Date
30-Aug-2007
Ref Project

Buy Standard

Technical specification
IEC TS 61994-1:2007 - Piezoelectric and dielectric devices for frequency control and selection - Glossary - Part 1: Piezoelectric and dielectric resonators
English language
21 pages
sale 15% off
Preview
sale 15% off
Preview

Standards Content (sample)

IEC/TS 61994-1
Edition 2.0 2007-08
TECHNICAL
SPECIFICATION
Piezoelectric and dielectric devices for frequency control and selection –
Glossary –
Part 1: Piezoelectric and dielectric resonators
IEC/TS 61994-1:2007(E)
---------------------- Page: 1 ----------------------
THIS PUBLICATION IS COPYRIGHT PROTECTED
Copyright © 2007 IEC, Geneva, Switzerland

All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form

or by any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from

either IEC or IEC's member National Committee in the country of the requester.

If you have any questions about IEC copyright or have an enquiry about obtaining additional rights to this publication,

please contact the address below or your local IEC member National Committee for further information.

IEC Central Office
3, rue de Varembé
CH-1211 Geneva 20
Switzerland
Email: inmail@iec.ch
Web: www.iec.ch
About the IEC

The International Electrotechnical Commission (IEC) is the leading global organization that prepares and publishes

International Standards for all electrical, electronic and related technologies.
About IEC publications

The technical content of IEC publications is kept under constant review by the IEC. Please make sure that you have the

latest edition, a corrigenda or an amendment might have been published.
ƒ Catalogue of IEC publications: www.iec.ch/searchpub

The IEC on-line Catalogue enables you to search by a variety of criteria (reference number, text, technical committee,…).

It also gives information on projects, withdrawn and replaced publications.
ƒ IEC Just Published: www.iec.ch/online_news/justpub

Stay up to date on all new IEC publications. Just Published details twice a month all new publications released. Available

on-line and also by email.
ƒ Electropedia: www.electropedia.org

The world's leading online dictionary of electronic and electrical terms containing more than 20 000 terms and definitions

in English and French, with equivalent terms in additional languages. Also known as the International Electrotechnical

Vocabulary online.
ƒ Customer Service Centre: www.iec.ch/webstore/custserv

If you wish to give us your feedback on this publication or need further assistance, please visit the Customer Service

Centre FAQ or contact us:
Email: csc@iec.ch
Tel.: +41 22 919 02 11
Fax: +41 22 919 03 00
---------------------- Page: 2 ----------------------
IEC/TS 61994-1
Edition 2.0 2007-08
TECHNICAL
SPECIFICATION
Piezoelectric and dielectric devices for frequency control and selection –
Glossary –
Part 1: Piezoelectric and dielectric resonators
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
PRICE CODE
ICS 31.140; 01.040.31 ISBN 2-8318-9298-8
---------------------- Page: 3 ----------------------
– 2 – TS 61994-1 © IEC:2007(E)
CONTENTS

FOREWORD...........................................................................................................................3

1 Scope...............................................................................................................................5

2 Normative references .......................................................................................................5

3 Terms and definitions .......................................................................................................5

Figure 1 – Configuration of a dielectric resonator (TE mode type) .....................................8

01δ

Figure 2 – Equivalent circuit of a piezoelectric vibrator (one-port resonator) ...........................9

Figure 3 – Frequency characteristics of the impedance near resonance................................11

Figure 4 – Equivalent circuit for a two-port SAW resonator ...................................................12

Figure 5 – Configuration of an interdigital transducer (IDT) ...................................................13

Figure 6 – Configuration of a one port SAW resonator ..........................................................16

Figure 7 – Configuration of a two port SAW resonator...........................................................21

---------------------- Page: 4 ----------------------
TS 61994-1 © IEC:2007(E) – 3 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION
_____________
PIEZOELECTRIC AND DIELECTRIC DEVICES
FOR FREQUENCY CONTROL AND SELECTION –
GLOSSARY –
Part 1: Piezoelectric and dielectric resonators
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-operation 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 “IEC 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 preparation. 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

consensus 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 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

transparently 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 provides no marking procedure to indicate its approval and cannot be rendered responsible for any equipment

declared to be in conformity with an IEC Publication.

6) All users should ensure that they have the latest edition of this publication.

7) No liability 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 (including 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 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. 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 Standards. 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, for any other reason, there is the

future but no immediate possibility of an agreement on an International Standard.

IEC 61994-1, which is a technical specification, has been prepared by IEC technical committee

49: Piezoelectric and dielectric devices for frequency control and selection.

This second edition of IEC 61994-1 cancels and replaces the first edition published in 2003.

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;
---------------------- Page: 5 ----------------------
– 4 – TS 61994-1 © IEC:2007(E)
– drawings inserted for easier understanding.
The text of this technical specification is based on the following documents:
Enquiry draft Report on voting
49/761/DTS 49/766/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 accordance with the IS0/lEC Directives, Part 2.

IEC 61994 consists of the following parts under the general title: Piezoelectric and dielectric

devices for frequency control and selection – Glossary:
- Part 1: Piezoelectric and dielectric resonators
- Part 2: Piezoelectric and dielectric filters
- Part 3: Piezoelectric oscillators
- Part 4-1: Piezoelectric materials – Synthetic quartz crystal
- Part 4-2: Piezoelectric and dielectric materials – Piezoelectric ceramics
- Part 4-3: Materials for dielectric devices
- Part 4-4: Materials – Materials for Surface Acoustic Wave (SAW) devices

The committee has decided that the contents of this publication will remain unchanged until the

maintenance result 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
• transformed into an international standard;
• reconfirmed;
• withdrawn;
• replaced by a revised edition, or
• amended.
A bilingual version of this publication may be issued at a later date.
___________
To be published.
---------------------- Page: 6 ----------------------
TS 61994-1 © IEC:2007(E) – 5 –
PIEZOELECTRIC AND DIELECTRIC DEVICES
FOR FREQUENCY CONTROL AND SELECTION –
GLOSSARY –
Part 1: Piezoelectric and dielectric resonators
1 Scope

This technical specification gives the terms and definitions for piezoelectric and dielectric

resonators 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 documents are indispensable for the application of this document. For

dated references, only the edition cited applies. For undated references, the latest edition of the

referenced document (including any amendments) applies.

IEC 60050(561):1991, International Electrotechnical Vocabulary (IEV) – Chapter 561:

Piezoelectric devices for frequency control and selection
Amendment 1 (1995)

IEC 60122-1:2002, Quarts crystal units of assessed quality – Part-1: Generic specification

IEC 60642:1979, Piezoelectric ceramic resonators and resonator units for frequency control and

selection – Chapter I: Standard values and conditions – Chapter II: Measuring and test

conditions

IEC 61019-1:2004, Surface acoustic wave (SAW) resonators – Part 1: Generic specification

IEC 61338-1:2004, Waveguide type dielectric resonators – Part 1: Generic specification

3 Terms and definitions
3.1
adjustment tolerance

the maximum permissible deviation of the working frequency of a piezoelectric resonator from

the nominal frequency at the reference temperature under specified conditions
[IEV 561-02-16 modified]
3.2
ageing tolerance

the maximum permissible deviation of the working frequency of a piezoelectric resonator from its

initial frequency which is observed with the passage of time under specified conditions

[IEV 561-02-17 modified]
3.3
ageing – long-term parameter variation

relationship which exists between any parameter (for example resonance frequency) and time

[IEC 61019-1, 4.2.9]
3.4
apodisation (spurious suppression for SAW devices)

weighting method produced by the change in finger overlap over the length of the IDT to

suppress the transverse spurious modes
---------------------- Page: 7 ----------------------
– 6 – TS 61994-1 © IEC:2007(E)
[IEV 561-06-18 modified]
3.5
anti-resonance frequency

the higher of two frequencies of a piezoelectric resonator vibrating alone, under specified

conditions, at which the electrical impedance of the resonator is resistive
[IEV 561-02-10]
3.6
bus bar

common electrode region of an IDT which connects individual fingers together and also

connects the IDT to an external circuit (see Figure 5)
[IEV 561-06-15 modified]
3.7
capacitance ratio
r =

where C and C represent the shunt capacitance and the motional capacitance respectively

0 1
in the equivalent circuit (see Figure 2)
the capacitance ratio indicates one of the merits of the resonator
[IEC 61019-1, 4.2.10.9 modified]
3.8
centre frequency of a two-port SAW resonator

arithmetic mean of two frequencies at which the attenuation relative to the minimum insertion

attenuation reaches a specified value
[IEC 61019-1, 4.2.11.9]
3.9
clamped capacitance (of a piezoelectric resonator)

the capacitance of a piezoelectric resonator measured at a frequency well above any

pronounced resonance

NOTE In practice, the value of the capacitance is often indirectly determined, because a direct measurement is

affected by the presence of factors such as lead inductance.
[IEV 561-02-35]
3.10
coaxial dielectric resonator

dielectric resonator characterized by a TEM mode field distribution with a coaxial waveguide

structure of finite length
[IEC 61338-1, 2.2.19]
---------------------- Page: 8 ----------------------
TS 61994-1 © IEC:2007(E) – 7 –
3.11
coplanar resonator

dielectric resonator characterised by a TEM mode field distribution. The structure is a

coplanar-line waveguide of finite length
[IEC 61338-1, 2.2.4]
3.12
coupling coefficient of SAW materials
the SAW electromechanical coupling coefficient is defined as follows:
k = 2

where Δv/v is the relative velocity change produced by short-circuiting the surface potential from

the open-circuit condition
[IEC 60862-2, 3.1.8; IEC 61019-1, 4.1.12]
3.13
crystal element

piezoelectric substrate cut to a given geometric shape, size and orientation with respect to the

crystallographic axes of the crystal
[IEC 60122-1, 2.2.1]
3.14
crystal resonator

the mounted crystal element that vibrates when an alternating electric field is applied between

the electrodes
[IEC 60122-1, 2.2.3 modified]
3.15
crystal unit
a crystal resonator mounted in an enclosure
[IEC 60122-1, 2.2.7]
3.16
d.c. breakdown voltage
the lowest d.c. voltage which causes the destruction of the resonator
[IEC 61019-1, 4.2.8]
3.17
dielectric material
material which predominantly exhibits dielectric properties
[IEC 61338-1, 2.2.1]
3.18
dielectric resonator
(ε ) and the structure of which is a
resonator using dielectrics with a high dielectric constant
dielectric waveguide of finite length as shown in Figure 1
[IEC 61338-1, 2.2.10]
---------------------- Page: 9 ----------------------
– 8 – TS 61994-1 © IEC:2007(E)
X ε X
Dielectric
resonator
Shielding
conductor
Support
IEC 1697/07
Figure 1 – Configuration of a dielectric resonator (TE mode type)
01δ
3.19
dielectric support

element supporting a dielectric resonator. The support is generally used for TE mode

01δ
resonators and has a low dielectric constant (see Figure 1)
[IEC 61338-1, 2.2.11]
3.20
drive level dependency
DLD

the permissible deviation of resonance frequency due to variation of the level of drive. The effect

of changes in drive level conditions upon the resonance resistance of the crystal unit

[IEC 60122-1, 2.2.37 modified]
3.21
electrode (of piezoelectric resonator)

an electrically conductive plate in proximity to or film in contact with a face of a crystal or ceramic

element by means of which a polarizing or driving field is applied to the element

[IEC 60122-1, 2.2.2 modified]
3.22
electromechanical coupling factor (of piezoelectric resonator)

a certain combination of elastic, dielectric and piezoelectric constants which appears naturally in

the expression of impedance of a resonator. A different factor arises in each particular family of

mode of vibration. The factor is closely related to the relative frequency spacing and is a

convenient measure of piezoelectric transduction.

Alternatively, the coupling factor may be interpreted as the square root of the ratio of the

electrical or mechanical work which can be accomplished to the total energy stored from a

mechanical or electrical power source for a particular set of boundary conditions

[IEC 60642, 3.2.14 modified]
3.23
enclosure

an enclosure of specific outline dimensions and material with a defined method of sealing

protecting the resonator and providing means of electrical connections to the circuit

---------------------- Page: 10 ----------------------
TS 61994-1 © IEC:2007(E) – 9 –
[IEV 561-01-12 modified, IEC 60122-1, 2.2.5 modified, IEC 60642, 3.1.5 modified]
3.24
equivalent circuit (of piezoelectric resonators)

the electrical circuit which has the same characteristics as a piezoelectric resonator in the

immediate neighbourhood of resonance

NOTE For example, one port piezoelectric resonator consists of series element L , C , R in parallel with C , as

1 1 1 0

shown in Figure 2 where L1, C1, R1 represent the motional inductance, capacitance and resistance respectively and C0

the shunt capacitance. The circuit of Figure 2 has the same impedance as a piezoelectric resonator in the

neighbourhood of resonance.
[IEV 561-02-07 modified]
L R
1 C 1
IEC 1698/07
Key
L motional inductance C shunt capacitance (static capacitance)
1 0
C motional capacitance Z = R + jX impedance of the circuit
1 e e
R motional resistance
Figure 2 – Equivalent circuit of a piezoelectric vibrator (one-port resonator)
3.25
external quality factor

quality factor due to the energy loss in the external circuit, excluding the energy dissipated in the

resonator
[IEC 61338-1, 2.2.27]
3.26
figure of merit
M =Q /r
where
Q is the quality factor,
r is the capacitance ratio.
the value indicates the activity of the resonator
[IEC 60122-1, IEC 61019-1, 4.2.10.10 modified]
---------------------
...

Questions, Comments and Discussion

Ask us and Technical Secretary will try to provide an answer. You can facilitate discussion about the standard in here.