Fm detecting circuit having a piezoelectric filter
阅读：260发布：2023-03-29
专利汇可以提供Fm detecting circuit having a piezoelectric filter专利检索，专利查询，专利分析的服务。并且An FM detecting circuit comprises a band pass filter composed of at least one piezoelectric resonator having three electrodes or a plurality of piezoelectric resonators having two electrodes and a transistor. The output voltage of the transistor is increased or decreased in proportion to the difference between the phases of the input and output voltages of the band pass filter, whereby the phase detection of the input voltage can be achieved.，下面是Fm detecting circuit having a piezoelectric filter专利的具体信息内容。
1. A circuit for detecting frequency modulated signals comprising: a band pass filter, having an input for receiving said frequency modulated signals and an output, composed of at least one piezoelectric resonator circuit having an input electrode connected to said input an output electrode connected to said output, and a reference potential electrode connected to a reference potential, and further having piezoelectric plate means disposed between said reference potential electrode and said input and output electrodes; and means, connected to said input and to said output, for providing a signal proportional to the phase difference between signals delivered to said input and output of said band pass filter respectively, said means comprising a transistor circuit having at least one transistor, said at least one transistor having a first electrode connected to said input and a second electrode connected to said output, whereby said transistor circuit produces a detected output representative of the variation of the frequency of the signal delivered to the input of said band pass filter.
2. A circuit according to claim 1, wherein said transistor circuit comprises a single transistor, the base electrode of which is connected to the output of said band pass filter and the emitter electrode of which is connected to the input of said band pass filter.
3. A circuit according to claim 1, wherein said transistor circuit comprises a single transistor, the emitter electrode of which is connected to the output of said band pass filter and the base electrode of which is connected to the input of said band pass filter.
4. A circuit according to claim 1, wherein said transistor circuit comprises a transistor differential amplifier having a pair of inputs and a differential output, one of said pair of inputs being connected to said input of said band pass filter and the other of said pair of inputs being connected to the output of said band pass filter.
5. A circuit according to claim 1, wherein said transistor circuit comprises a pair of transistors connected in series, one of the electrodes of each transistor in said pair being connected to the respective input and output of said band pass filter.
6. A circuit according to claim 1, wherein said piezoelectric resonator circuit comprises a plurality of interconnected piezoelectric resonators, each having two electrodes and a piezoelectric plate disposed between each of said two electrodes, while one electrode of each of said resonators is connected to a common junction and the other electrodes comprise said input, output and reference potential electrodes, respectively.
7. A circuit according to claim 6, wherein said plurality of interconnected resonators comprises a pair of resonators connected in series to form said filter, one resonator of said pair of resonators having one of its electrodes connected to said input and one electrode of the other resonator of said pair of resonators being connected to said output, and wherein said transistor circuit comprises a single transistor, the base electrode of which is connected to the base of said band pass filter and the emitter electrode of which is connected to the input of said band pass filter.
8. A circuit according to claim 6, wherein said plurality of interconnected resonators comprises a pair of resonators connected in series to form said filter, one resonator of said pair of resonators having one of its electrodes connected to said input and one electrode of the other resonator of said pair of resonators connected to said output and wherein said transistor circuit comprises a single transistor, the emitter electrode of which is connected to the output of said band pass filter and the base electrode of which is connected to the input of said band pass filter.
9. A circuit according to claim 4, wherein said piezoelectric resonator circuit comprises a plurality of interconnected piezoelectric resonators each having two electrodes and a piezoelectric plate disposed between each of said two electrodes, while one electrode of each of said resonators is connected to a common junction and the other electrodes comprise said input, output and reference potential electrodes, respectively.
10. A circuit according to claim 5, wherein said piezoelectric resonator circuit comprises a plurality of interconnected piezoelectric resonators each having two electrodes, and a piezoelectric plate disposed between each of said two electrodes, while one electrode of each of said resonators is connected to a common junction and the other electrodes comprise said input, output and reference potential electrodes respectively.
11. A circuit according to claim 1, wherein the output of said transistor circuit is connected to the collector of said transistor.
12. A circuit according to claim 5, wherein said pair of series connected transistors are connected to the respective inputs and outputs of said band pass filter at the bases thereof, and wherein the output of said series connected pair of transistors is taken from the collector of one of said transistors.
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