Surface wave filter for tv if stage
阅读：214发布：2021-07-20
专利汇可以提供Surface wave filter for tv if stage专利检索，专利查询，专利分析的服务。并且Increased selectivity is accomplished by arranging the input and output transducers of an acousto-electric surface-wave filter in series on a common piezo-electric substrate. Undesired signal feed-through due to inherent coupling between the input and output transducers is substantially attenuated by symmetrically arranging two output transducers on opposite sides of the input transducer such that the output transducers are mirror images of one another about the midline of the central input transducer, with one side of the input transducer common and grounded to the opposite sides of the output transducer. When processed by a differential amplifier, the symmetry of the grounds and outputs with respect to the input allows the capacitively and/or inductively coupled signals to be canceled while the signal due to the surface acoustic wave is enhanced. An increase in the selectivity of the filter by reducing the sidelobe amplitude is accomplished by setting the number of finger pairs of the input transducer equal to three halves times the number of finger pairs in the output transducer.，下面是Surface wave filter for tv if stage专利的具体信息内容。
1. A solid state filter comprising: a. an acoustic surface wave propagating medium; b. an input transducer having upper and lower interleaved combs of electrodes, the number, size and spacing of said electrodes being selected for predetermined trap frequencies, and responsive to an applied signal for launching bi-directional surface waves in said medium; and c. two output transducers each having upper and lower interleaved combs of electrodes, the number size and spacing of said electrodes being selected for predetermined trap frequencies, said output transducers symmetrically arranged about said input transducer coupled to a second and third portion of said medium and responsive to said bi-directional acoustic surface wave launched therein for produciNg two output signals which are 180* out of phase, said lower comb of said input transducer is electrically connected to ground potential and to both of said upper combs of said output transducers, and said output transducers have the same number of electrodes and said input transducer has three halves times the number of electrodes of either output transducer.
2. The filter of claim 1 wherein said medium is lithium niobate.
3. The filter of claim 1 wherein said medium is a YZ cut of lithium niobate.
4. The filter of claim 3 wherein the ends of said medium are cut at an angle substantially equal to arctan 0.5 to reduce reflections from the ends.
5. The filter of claim 4 wherein the angle cut ends are covered with an acoustic attenuating material.
6. A solid state intermediate frequency filter for television receivers comprising: a. an acoustic surface wave propagating medium; b. an input transducer having upper and lower interleaved combs of electrodes, the number, size and spacing of said electrodes being selected for predetermined trap frequencies, said input transducer coupled to a first portion of said medium and responsive to an applied signal for launching bi-directional surface waves in said medium, said lower comb of said input transducer electrically connected to ground potential; c. two output transducers each having upper and lower interleaved combs of electrodes, the number, size and spacing of said electrodes being selected for predetermined trap frequencies, each of said output transducers being mirror images of each other about the midline of said input transducer, both of said upper combs of said output transducers electrically connected to said lower comb of said input transducer, said output transducers coupled to a second and third portion of said medium and responsive to said bi-directional acoustic surface wave launched therein producing a parasitic signal and two output signals, said output signals being 180* out of phase; and d. a differential amplifier electrically connected to said output transducers for enhancing said output signals and cancelling said parasitic signal.
7. The filter of claim 6 wherein said output transducers have the same number of electrodes and said input transducer has three halves times the number of electrodes of either output transducer.
8. The filter of claim 7 wherein the ends of said medium is cut at an angle substantially equal to arctan 0.5 to reduce reflections from the ends.
9. The filter of claim 6 wherein the number of electrodes in each of said output transducers is 24 and the number of electrodes in said input transducer is 16.
10. The filter of claim 6 wherein the number of electrodes in each of said output transducers is 30 and the number of electrodes in said input transducer is 20.
11. A solid state intermediate frequency filter for television receivers comprising: a. a first acoustic surface wave medium; b. a first input transducer having upper and lower interleaved combs of electrodes, the number, size and spacing of said electrodes being selected for predetermined trap frequencies, said first input transducer coupled to a first portion of said first medium and responsive to an applied signal for launching bi-directional surface waves in said first medium, said lower comb of said first input transducer electrically connected to ground potential; c. a first and second output transducer each having upper and lower interleaved combs of electrodes, the number, size and spacing of said electrodes being selected for predetermined trap frequencies, each of said output transducers being mirror images of each other about the midline of said first input transducer, both of said upper combs of said output transducers electrically connected to said lower comb of said first input transducer, said first and second output transducers coupled to a second and third portion of said first medium and responsive to said bi-directional acoustic surface wave launched therein producing a parasitic signal and two output signals, said output signals being 180* out of phase; d. a first differential amplifier electrically connected to said first and second output transducers for enhancing said output signals and cancelling said parasitic signal; e. a second acoustic surface wave propagating medium; f. a second input transducer having upper and lower interleaved combs of electrodes, the size, number and spacing of said electrodes being selected for predetermined trap frequencies, said second input transducer coupled to a first portion of said second medium and electrically connected to said first differential amplifier for launching a bi-directional surface wave in said second medium, said lower comb of said second input transducer electrically connected to ground potential; g. a third and fourth output transducers, each having upper and lower interleaved combs of electrodes, the number, size and spacing of said electrodes being selected for predetermined trap frequencies, each of said third and fourth transducers being mirror images of each other about the midline of said second input transducer, both of said upper combs of said third and fourth output transducers electrically connected to said lower comb of said second input transducer, said third and fourth output transducers coupled to a second and third portion of said second medium and responsive to said bi-directional acoustic surface wave launched therein producing a parasitic signal and two output signals, said output signals being 180* out of phase; and h. a second differential amplifier electrically connected to said output transducers for enhancing said output signals and cancelling said parasitic signal of said third and fourth output transducer.
12. The filter of claim 11 wherein the number of electrodes in said first and second output transducer is 24, the number of electrodes in said first input transducer is 16, the number of electrodes in said third and fourth output transducer is 30 and the number of electrodes in said second input transducer is 20.
13. A surface wave device having a substrate for propagating acoustic waves, an input transducer positioned on said substrate and having first and second interweaved combs of electrodes formed of electrically conductive material, and first and second output transducers positioned on said substrate on opposite sides of said input transducer and each having first and second interweaved combs of electrodes formed of said electrically conductive material, said input transducer having an opposite orientation from the first and second output transducers, the improvement comprising first and second conductors of said electrically conductive material formed on said substrate and connected from said first combs of electrodes of said input transducer to said first combs of electrodes of said first and second output transducers, respectively, said first and second conductors extending along the surface of said substrate and through regions which are between said first and second output transducers and said input transducer, respectively, and providing a common electrical connection between said first combs of electrodes of said input and output transducers.
14. The device of claim 13 wherein the center of said input transducer has a bottom comb grounded which is commected by said conductors to the top combs of said output transducers, said conductors being symmetrically disposed with respect to the input transducer.
15. The device of claim 13 wherein said first conductor is connected between said input transducer and to an end of one of said electrodes of said first output transducer, said electrode being the one which is closest to said input transducer.
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