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 1 terms for surface acoustic wave filters ¡surface acoustic wave saw an acoustic wave propagating along a surface of an elastic substrate whose amplitude decays exponentially with substrate depth ¡surface acoustic wave filter saw filter a filter characterized by a surface acoustic wave which is generated by idt and propagates along a substrate surface to a receiving idt ¡saw coupling coefficient saw electromechanical coupling coefficient defined by ks2 2|v/v which means the efficiency to transform electrical energy into acoustic energy or vice versa ¡idt interdigital transducer a comb structure consisting of interleaved metal electrodes whose function is to transform electrical energy into acoustic energy or vice versa b
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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 fundamentals 3 3-2 substrate zno and single crystal are usually used as substrate materials for the surface acoustic wave filters substrates specifically available for the surface acoustic wave filter for color television sets should satisfy the following conditions 1 the surface acoustic wave electromechanical coupling coefficient ks is large 2 the effective dielectric constant is proper 3 propagation velocity has a small temperature coefficient 4 propagation loss of the surface wave is small 5 stable against heat and little change by aging 6 cost of producing the substrate is low 7 the material constants in/between substrates have little dispersion the characteristics 1 through 4 refer to the electric properties of the s
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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 fundamentals 3 3-6 electrical characteristics 3-6-1 amplitude characteristics fig.7 shows the characteristics of the surface acoustic wave filter for the television vif circuit being remarkably different from conventional lc filters the saw filter has a response of many peaks and bottoms outside the pass band it is necessary to add the items of spurious attenuation of upper side and lower side 0 10 20 attenuation db 30 40 50 60 70 52 54 56 58 60 1800 1600 1400 1200 1000 800 600 400 62 group delay time nsec 3-6-2 phase characteristics in the case of surface acoustic wave filters the output signal has a delay with regard to the input signal corresponding to the time of propagation from input idt to output idt of the surface
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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 3 fundamentals 3-6-5 measurement method ¡measurement by means of network analyzer amplitude and phase group delay time characteristics can be measured directly by means of the rf network analyzer network analyzer for this use is made by several makers surface acoustic wave filter for video if of television sets has many specified points murata adopted the synthesizer type programmable network analyzer which measures quickly and accurately judges of go or no go for the specifications automatically ¡measurements in the time domain the measurement system used to verify the spurious levels of the tte etc is shown in fig.10 typical pulse responses are shown in fig.11 pulse rise time should be optimally long because ears may
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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 4 application and if it is a large value the output impedance of the transistor itself will be upper limit thus it is of the order of 100 to 1 k is useful 4 one chip ic for vif the input impedance of the one chip ic for television vif is of the order of 1k to 3k osc 2 osc 2 15 1000 56 47 if out 39 +b 1000 1000 10 2200 if out 22 +b 1000 a 4-1-2 connection of the tuner and the vif stage when using the saw filter the importance of its relation with the impedances of the stages located after and before the saw filter was already described in addition the connection between the tuner and the next stages requires special attention as shown in fig.13 there are many types of if output circuits of the tuner the most commonly used
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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 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 suc
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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 application 4 4-2-2 postamplifier system ¡postamplifier system the system using the amplifier for compensation of the insertion loss after the saw filter is called postamplifier system fig.24 shows an example of postamplifier system if the postamplifier is composed of an emitter grounded bipolar transistor the input impedance will have a value of the order of 50 to 100 usually the output impedance of the tuner has a nominal value of 75 the external terminating impedances of the postamplifier system can not be changed so easily as the preamplifier system when both input and output of the high impedance saw filter are terminated by 75 the mismatching rate is too much resulting in large insertion loss it is necessary to modif
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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 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
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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 5 appendix 5-3 impedance of the surface acoustic wave filter so far the discussions related to the impedance of the saw filter refer to the equivalent circuit of fig.12 with the value of the resistor and the capacitor considered as constant value however the values of both capacitor and resistor present a frequency dependence for example fig.35 and 36 present the frequency characteristics of rpi cpi and rpo and cpo of safgn58m7vh0z00b03 the input side rpi cpi and the output side rpo cpo present different frequency characteristics due to the difference of the idt while output the idt is of normal electrode of the constant overlap and constant pitch the input idt is of the apodized weighted one the measurement result of the
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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 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 min ¤+
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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 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 ca
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