SAW Filters for TV/VCR by Murata Manufacturing Co.,Ltd.

More catalogs by Murata Manufacturing Co.,Ltd. | SAW Filters for TV/VCR | 29 pages | 2006-11-24

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SAW Filters for TV/VCR is listed under these categories

Industrial Supply > Electrical & Test > Electronic Components > Passive Components > Inductors Coils & Filters

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please read caution and notice in this catalog for safety this catalog has only typical specifications therefore you are requested to approve our product specification or to transact the approval sheet for product specification before your ordering p06e3.pdf 01.10.24 contents 1 terms for surface acoustic wave filters yyyyy02 2 features yyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyy03 3 fundamentals yyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyy04 3-1 electrode pattern design 04 3-2 substrate 05 3-3 photolithography 05 3-4 sputter 06 3-5 assembly 06 3-6 electrical characteristics 07 3-6-1 amplitude characteristics 07 3-6-2 phase characteristics 07 3-6-3 insertion loss 08 3-6-4 measurement circuit 09 3-6-5 measurement method 10 1 2 3 4 5 terms for surface acoustic wave filters features fundamentals application appendix 4 application yyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyy11 4-1 connection of the surface acoustic wave filter with other blocks 11 4-1-1 input/output impedances of the respective blocks

please read caution and notice in this catalog for safety this catalog has only typical specifications therefore you are requested to approve our product specification or to transact the approval sheet for product specification before your ordering p06e3.pdf 01.10.24 3 fundamentals 3-1 electrode pattern design the basic configuration of a surface acoustic wave filter is two idts on the surface of the piezoelectric substrate the first idt connected to the signal source generates a surface acoustic wave which propagates along a substrate surface to the second idt which transforms saw energy into electrical voltage on a load connected to the idt frequency characteristics of the idts can be calculated by means of impulse model in case of normal idt which has a constant pitch and a constant overlap the idt and the corresponding impulse is shown in fig.2 below when a voltage is fed to the idt the direction of the voltage is the positive-negativepositive-negative direction at 0/2 interval

please read caution and notice in this catalog for safety this catalog has only typical specifications therefore you are requested to approve our product specification or to transact the approval sheet for product specification before your ordering p06e3.pdf 01.10.24 3 fundamentals 3-4 sputter for the purpose of getting piezoelectric thin film on glass zno must be deposited on glass substrate by sputtering a simplified sputtering apparatus is shown in fig.5 first berzia is pumped to high vacuum then low pressure argon and oxygen gas flow then a high frequency voltage is fed to zno ceramic target cathode so that the argon gas is ionized ionized argon goes to target makes the target composing element of zno sputtered out these are eventually coated onto the idt portions of the glass substrate murata has established a stable technique that can produce high performance zno thin film with high deposition rate and low variation of c axis orientation berzia glass plate shutter zno target

please read caution and notice in this catalog for safety this catalog has only typical specifications therefore you are requested to approve our product specification or to transact the approval sheet for product specification before your ordering p06e3.pdf 01.10.24 fundamentals 3 purely resistive assuming rs is equal to the absolute value of the input impedance zin of the saw filter and rl is equal to the absolute value of the output impedance zout of the saw filter the power loss becomes minimum strictly speaking the condition for minimum power loss slightly differs from the condition rs zin rl zout since zin and zout have capacitive components the power loss can be further decreased by performing the cancellation of these capacitive components by means of inductance and matching the remaining pure resistive components with rs and rl in this case the power loss is actually minimized thanks to the conjugate impedance matching as described above the power loss can be

please read caution and notice in this catalog for safety this catalog has only typical specifications therefore you are requested to approve our product specification or to transact the approval sheet for product specification before your ordering p06e3.pdf 01.10.24 4 application 4-1 connection of the surface acoustic wave filter with other blocks 4-1-1 input/output impedances of the respective blocks the most common method to compensate the high insertion loss of the saw filter is putting an amplifier in this case the connection of the four stages listed below becomes very important in order to use the saw filter perfectly 1 tuner 2 saw filter 3 amplifier for compensation of the insertion loss 4 one chip ic for color television vif stage as described before the characteristics of the saw filter especially the insertion loss and tte are influenced by impedance matching in order to connect the saw filter to the stages before and after we must cleverly consider the facts described

please read caution and notice in this catalog for safety this catalog has only typical specifications therefore you are requested to approve our product specification or to transact the approval sheet for product specification before your ordering p06e3.pdf 01.10.24 4 application 4-2 application circuit 4-2-1 preamplifier system ¡preamplifier system the system where the insertion loss compensation amplifier is placed before the saw filter is called a preamplifier system fig.16 a is an example of a preamplifier system and it can be converted into the configuration shown in fig.16 b in ac operation the value of rs shown in fig.16 b can be controlled by changing the value of r1 on the other hand rl can also be controlled by changing the value of r2 as described previously the insertion loss of the saw filter depends upon the impedance matching to make the external terminating impedance equal to the impedance of the saw filter impedance of the saw filter including the tuning coil when

please read caution and notice in this catalog for safety this catalog has only typical specifications therefore you are requested to approve our product specification or to transact the approval sheet for product specification before your ordering p06e3.pdf 01.10.24 4 application compensated for by changing gm as a result of changing the collector current resulting therefore in a constant value of 20 log gm·rs however when the value of rs is too small the collector current is limited by its maximum collector dissipation gm are not become so high consequently it is not possible to compensate the reduction of rs in using low impedance saw filters in the preamplifier system the following modifications are required ¡use of the low impedance saw filter in the preamplifier system an impedance conversion circuit is required for the use of a low impedance saw filter in the preamplifier system fig.22 shows an example of use of a low impedance saw filter in the preamplifier system a

please read caution and notice in this catalog for safety this catalog has only typical specifications therefore you are requested to approve our product specification or to transact the approval sheet for product specification before your ordering p06e3.pdf 01.10.24 application 4 4-2-3 method for the compensation of the insertion loss without amplifier the gain of the 1 chip vif ic can be increased it is possible to leave out the insertion loss compensation amplifier as shown in fig.30 from another point of view it is possible to say that the postamplifier described previously was absorbed in the vif 1 chip ic now the power loss and the voltage loss are related as follows as described in 3-6-3 power loss voltage loss log rl/4rs assuming that the power loss has a certain value const to suppress the tte the voltage loss can be made small by increasing the rl/rs ratio the output impedance of the tuner which is the signal source of the saw filter is assumed to have a fixed value of 75

please read caution and notice in this catalog for safety this catalog has only typical specifications therefore you are requested to approve our product specification or to transact the approval sheet for product specification before your ordering p06e3.pdf 01.10.24 appendix 5 approximately 500khz high level of direct breakthrough makes not only the ripples in the group delay time and amplitude but also the trap depths reduction as shown in fig.33 with deterioration in the attenuation level outside the pass band as described previously tte level can be suppressed to less than ­40db by increasing the power loss to a value larger than 18db by means of the mismatching on the other hand the level of the direct breakthrough is influenced by the printed circuit layout the causes of the direct breakthrough can be classified in 3 items ­ electrostatic causes like stray capacitance etc ­ electromagnetic inductions due to the currents passing through the printed pattern ­ due to the

please read caution and notice in this catalog for safety this catalog has only typical specifications therefore you are requested to approve our product specification or to transact the approval sheet for product specification before your ordering p06e3.pdf 01.10.24 5 appendix 5-4 reliability test surface acoustic wave filter should be used carefully not to exceed the maximum rating shown in table 3 below murata performs periodic reliability tests for the saw filter the conditions of them are shown in table 4 the data of safgn58m7vh0z00b03 are shown in fig.40 which shows that the variation is small enough compared to the limit table 5 test items vabration drop lead pull lead bend heat resistivity for melt solder soldering humidity test thermal stress test test conditions 600 3300 r.p.m amplitude p.p 1.5mm x,y,z directions 2h each 100cm 3 times 1 kg 15 seconds 0.3kg 1 return 260°c 10 seconds 230°c 5sec covered with solder more than 90 of the lead 60°c 500 hours 95 rh -55°c 30

please read caution and notice in this catalog for safety this catalog has only typical specifications therefore you are requested to approve our product specification or to transact the approval sheet for product specification before your ordering p06e3.pdf 01.10.24 note 1 export control for customers outside japan murata products should not be used or sold for use in the development production stockpiling or utilization of any conventional weapons or mass-destructive weapons nuclear weapons chemical or biological weapons or missiles or any other weapons for customers in japan for products which are controlled items subject to the foreign exchange and foreign trade law of japan the export license specified by the law is required for export 2 please contact our sales representatives or product engineers before using our products listed in this catalog for the applications listed below which require especially high reliability for the prevention of defects which might directly