IEC 61019-2:2005

INTERNATIONAL IEC
STANDARD 61019-2
Second edition
2005-05
Surface acoustic wave (SAW) resonators –
Part 2:
Guide to the use
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INTERNATIONAL IEC
STANDARD 61019-2
Second edition
2005-05
Surface acoustic wave (SAW) resonators –
Part 2:
Guide to the use
 IEC 2005  Copyright - all rights reserved
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– 2 – 61019-2  IEC:2005(E)
CONTENTS
FOREWORD.3
INTRODUCTION.5

1 Scope.6
2 Normative references .6
3 Technical considerations .6
4 Fundamentals of SAW resonators.7
4.1 Basic structure .7
4.2 Principle of operation .7
5 SAW resonator characteristics.8
5.1 Reflector characteristics .8
5.2 SAW resonator characteristics.10
5.3 Spurious modes .14
5.4 Substrate materials and their characteristics .15
5.5 Available characteristics.17
6 Application guide.19
6.1 Oscillator circuits and oscillation condition .19
6.2 Practical remarks for oscillator applications.21
7 Checklist of SAW resonator parameters for drawing up specifications .22

Bibliography.25

61019-2  IEC:2005(E) – 3 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
SURFACE ACOUSTIC WAVE (SAW) RESONATORS –

Part 2: Guide to the use
FOREWORD
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International Standard IEC 61019-2 has been prepared by IEC technical committee 49:
Piezoelectric and dielectric devices for frequency control and selection.
This second edition cancels and replaces the first edition published in 1995. This edition
constitutes a technical revision.
The main changes with respect to the previous editon are listed below:
• at the end of 5.1, the edge reflector has been added. Its reference literature has been
inserted in the bibliography;
• in Table 1, the propagation properties of LiNbO (64° Y) have been added;
• in Table 3, the clause and subclause numbers have been corrected in order to be
consistent with IEC 61019-1 (2004) which has replaced IEC 61019-1-1 (1990) and IEC
61019-1-2 (1993).
– 4 – 61019-2  IEC:2005(E)
The text of this standard is based on the following documents:
FDIS Report on voting
49/714/FDIS 49/723/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.
IEC 61019 consists of the following parts, under the general title Surface acoustic wave
(SAW) resonators
Part 1: Generic information
Part 2: Guide to the use
Part 3: Standard outlines and lead connections
This publication has been drafted in accordance with the ISO/IEC Directives, Part 2.
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
• reconfirmed;
• withdrawn;
• replaced by a revised edition, or
• amended.
A bilingual version of this publication may be issued at a later date.

61019-2  IEC:2005(E) – 5 –
INTRODUCTION
This part of IEC 61019 gives practical guidance to the use of SAW resonators which are used
in telecommunications, radio equipments and consumer products. IEC 61019-1 can be referred
to for general information, standard values and test conditions.
The features of these SAW resonators are small size, light weight, adjustment-free and high
stability. In addition, the operating frequency of SAW resonators extends to the VHF and UHF
ranges.
This part has been compiled in response to a generally expressed desire on the part of both
users and manufacturers for a guide to the use of SAW resonators, so that the resonators
may be used to their best advantage. To this end, general and fundamental characteristics
have been explained in this guide.

– 6 – 61019-2  IEC:2005(E)
SURFACE ACOUSTIC WAVE (SAW) RESONATORS –

Part 2: Guide to the use
1 Scope
SAW resonators are now widely used in a variety of applications: VCR RF-converters, CATV
local oscillators, measuring equipment, remote control and so on. While SAW resonators are
also applied to narrow bandwidth filters, the scope of this part of IEC 61019 is limited to SAW
resonators for oscillator applications
It is not the aim of this guide to explain theory, nor to attempt to cover all the eventualities
which may arise in practical circumstances. This guide draws attention to some of the more
fundamental questions, which should be considered by the user before he places an order for
a SAW resonator for a new application. Such a procedure will be the user's insurance against
unsatisfactory performance.
Standard specifications, such as those of the IEC of which this guide forms a part, and
national specifications or detail specifications issued by manufacturers, will define the
available combinations of resonance frequency, quality factor, motional resistance, parallel
capacitance, etc. These specifications are compiled to include a wide range of SAW
resonators with standardized performances. It cannot be over-emphasized that the user
should, wherever possible, select his SAW resonators from these specifications, when
available, even if it may lead to making small modifications to his circuit to enable the use of
standard resonators. This applies particularly to the selection of the nominal frequency.
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 61019-1:2004, Surface acoustic wave (SAW) resonators – Part 1: Generic specification
IEC 61019-3:1991, Surface acoustic wave (SAW) resonators – Part 3: Standard outlines and
lead connections
3 Technical considerations
It is of prime interest to a user that the resonator characteristics should satisfy particular
specifications. The selection of oscillating circuits and SAW resonators to meet such
specifications should be a matter of agreement between user and manufacturer.
Resonator characteristics are usually expressed in terms of resonance frequency, motional
resistance, quality factor and parallel capacitance (for the one-port type) and centre
frequency, insertion attenuation, loaded and unloaded quality factor, input capacitance and
output capacitance (for the two-port type). A standard method for measuring resonator
characteristics is described in 8.5 and 8.6 of IEC 61019-1. The specifications are to be
satisfied between the lowest and highest temperatures of the specified operating temperature
range and before and after environmental tests.

61019-2  IEC:2005(E) – 7 –
4 Fundamentals of SAW resonators
4.1 Basic structure
SAW resonators consist of interdigital transducers (IDT) and of grating reflectors, which are
placed on the surface of a piezoelectric substrate. In most cases, the grating reflectors are
made of thin metal (such as Al, Au) film while, in some cases, they are constructed with
periodic grooves. The die is bonded by an adhesive agent into a sealed enclosure, and the
IDT is electrically connected to the terminals with bonding wires. There are two SAW
resonator configurations. One is a one-p
...