IEC 60368-1:2000/AMD1:2004

IEC 60368-1 ®
Edition 4.0 2004-08
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
AMENDMENT 1
AMENDEMENT 1
Piezoelectric filters of assessed quality –
Part 1: Generic specification
Filtres piézoélectriques sous assurance de la qualité –
Partie 1: Spécification générique

IEC 60368-1:2000/A1:2004
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IEC 60368-1 ®
Edition 4.0 2004-08
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
AMENDMENT 1
AMENDEMENT 1
Piezoelectric filters of assessed quality –

Part 1: Generic specification
Filtres piézoélectriques sous assurance de la qualité –

Partie 1: Spécification générique

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
PRICE CODE
INTERNATIONALE
CODE PRIX H
ICS 31.140 ISBN 978-2-83220-706-2

– 2 – 60368-1 Amend. 1  IEC:2004
FOREWORD
This amendment has been prepared by IEC technical committee 49: Piezoelectric and dielectric
devices for frequency control and selection.
This bilingual version (2013-05) corresponds to the monolingual English version, published in
2004-08.
The text of this amendment is based on the following documents:
FDIS Report on voting
49/682/FDIS 49/688/RVD
Full information on the voting for the approval of this amendment can be found in the report on
voting indicated in the above table.
The French version of this amendment has not been voted upon.
The committee has decided that the contents of this amendment and the base 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• withdrawn,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.
_____________
Page 9
Delete the following two items in the list of parts:
Part 5: Sectional specification – Qualification approval (IEC 60368-5, under consideration)
Part 5-1: Blank detail specification – Qualification approval (IEC 60368-5-1, under consider-
ation)
60368-1 Amend. 1  IEC:2004 – 3 –
Page 17
Replace Figures 1, 2 and 3 by the following Figures 1, 2 and 3:

IEC  1124/04
Figure 1 – Symbol of monolithic filter

IEC  1125/04
Figure 2 – Symbol of tandem monolithic filter

– 4 – 60368-1 Amend. 1  IEC:2004

IEC  1126/04
Figure 3 – Symbol of monolithic multiple pole resonator
Page 21
Add, after definition 2.2.27, the following new definition:
2.2.28
group delay
the time equal to the first derivative of the phase shift, in radians, with respect to the angular
frequency
Renumber existing definitions 2.2.28 to 2.2.40 as 2.2.29 to 2.2.41.

Page 29
Add, after definition 2.2.40 (old), the following new definitions and renumber the existing
definitions 2.2.41 to 2.2.45 as 2.2.45 to 2.2.49:
2.2.42 intermodulation product(s)
undesired signals resulting from the combination of independent input signals within the filter.
For two signals of frequencies f and f , the intermodulation product(s) have frequencies of the
1 2
form
(M f ± N f ) or (M f ± N f )
1 2 2 1
where M, N = 1, 2, 3, .
Intermodulation product(s) of signals f , f outside the pass-band are called out-of-band
1 2
intermodulation, intermodulation product(s) of signals f , f inside the pass-band are called
1 2
in-band intermodulation.
2.2.43 intermodulation ratio
the difference, expressed in decibels, between the signal output of reference in the pass-band
and the level of the intermodulation product(s)

60368-1 Amend. 1  IEC:2004 – 5 –
2.2.44 intercept point
the (virtual) output level (in dBm), where the signal output of reference in the pass-band and the
intermodulation product(s) would become the same, on the assumption that the level of the input
signals increase
Page 37
3.6.3 Qualification approval
Replace the text as follows:
Qualification approval is appropriate for components manufactured to a standard design and
established production process and conforming to a published detail specification.
The programme of tests defined in the detail specification for the appropriate assessment and
severity level applies directly to the piezoelectric filter to be qualified, as prescribed in 3.8.

Page 49
4.5.5 Envelope delay time
Replace the title and text of this subclause by the following:
4.5.5 Group delay
The filter shall be connected to the test circuit as shown in Figure 8 and with the specified
terminating impedance as given in the detail specification except that the measuring equipment
shall set the group delay mode to the measure the group delay directly.
The group delay may be determined by calculation by measuring the phase shift, using the
procedure given in 4.5.3, at two different frequencies expressed as:
ω±∆ω / 2
where
ω= 2πf
The group delay can then be calculated from the following formula:
t =∆Φ ∆ω
g
where
t is group delay;
g
∆Φ is the difference between the two phase shift measurements;

∆ω is the frequency difference in radians per second.

The group delay shall be within the limits as stated in the detail specification.

– 6 – 60368-1 Amend. 1  IEC:2004
4.5.6 Envelope delay time as a function of temperature
Replace the title and text of this subclause by the following:
4.5.6 Group delay as a function of temperature
To determine the group delay as a function of temperature, the procedure described in 4.5.5
shall be used, except that the measurements shall be taken over the specified temperature
range and the rated level of drive as specified in the detail specification.
The group delay shall be within the limits as stated in the detail specification.

Page 53
4.5.9 Intermodulation distortion
Replace the title and text of this subclause by the following:
4.5.9 Intermodulation
The filter shall be connected to the test circuit as shown in Figure 10, with the terminating
impedance and at the level of drive as specified in the specification.

Signal combining
L ; f
1 1
network
Generator
Spectrum
analyzer
Filter
R Z
s
L ; f
2 2
X X
s under L
R
Z
L
test
Generator
2 Input Input
matching matching
network network
Test fixture
IEC  1127/04
Figure 10 – Test circuit for the intermodulation measurement
The two signal generators shall be capable of covering the frequency range and providing
sufficient power level to provide the correct power at the filter after passing through the matching
network. They shall also provide an output with extremely high single-noise ratio and lower
higher harmonic content.
The spectrum analyzer shall have a reference attenuation of greater than P + 10 dB at f and f
1 2
when tuned to the relevant intermodulation product(s):
where
P is the specified level of intermodulation ratio;
f is the nominal frequency of the filter under test;
f is the frequency of signal generator 1 ( f = f + Δf or f = f – Δf );
1 1 0 1 0
60368-1 Amend. 1  IEC:2004 – 7 –
f is the frequency of signal generator 2 ( f = f + 2Δf or f = f – 2Δf ).
2 2 0 2 0
The marks of “+” or “–” are taken as the combination of the same mark. The value of Δf is
specified in the detail specification.
However, precautions shall be taken to ensure that the spectrum analyzer provides sufficient
guard against intrinsic intermodulation product(s) of the same order as those being measured.
Two identical unmodulated signals of levels L and L with frequencies f and f , as specified in
1 2 1 2
the detail specifications, shall be set on the two signal generators and simultaneously applied to
the filter under test.
The spectrum analyzer shall be adjusted to display the two-tone test signal and the inter-
modulation product(s) to be measured (Figure 11).

Signal output of reference
Intermodulation product
Noise floor
f f f
0 1 2 (Frequency)
∆f
2∆f
IEC  1128/04
Figure 11 – Measurement of out-of-band intermodulation
The intermodulation ratio is the difference in decibels between the signal output of reference
(the signal of f which appears in an output, when the signal of f of the same level as L and L
0 0 1 2
is input into a filter) and the intermodulation product(s).
The third order intercept point (IP3) is got according to the following method.
As shown in Figure 12, the straight line of an inclination 1 is drawn from the intersection of the
specified input level and the signal output of reference. Then, the straight line of an inclination 3 is
drawn from the intersection of the specified input level and intermodulation product. The
intersection of these two straight lines is the third order intercept point (IP3). The input level of this
point is called input intercept point and is used for the specification of piezoelectric filter.
NOTE It is important to check that the equipment is producing acceptable low levels of intermodulation product(s) by
repeating the test with the filter removed.
Signal level  dBm
Intermodulation ratio
– 8 – 60368-1 Amend. 1  IEC:2004

Intercept point
Signal output of reference
Intermodulation product
Noise floor
Input intercept point
Specified input level
IEC  1129/04
Input level  dBm
Figure 12 – Input/output signal level of intermodulation (general)

___________
Output level  dBm
Intermodulation ratio
– 10 – 60368-1 Amend. 1  CEI:2004
AVANT-PROPOS
Le présent amendement a été établi par le comité d’études 49 de la CEI: Dispositifs
piézoélectriques et diélectriques pour la commande et le choix de la fréquence.
La présente version bilingue (2013-05) correspond à la version anglaise monolingue publiée en
2004-08.
Le texte anglais de cet amendement est issu des document
...