FREQUENCY SYNTHESIZER
PROBLEM TO BE SOLVED: To solve a problem of a conventional direct digital synthesizer(DDS) that is excellent as a stable variable frequency oscillating source but has caused spurious radiation in very many frequencies when the DDS is used for a reference signal source to configure a frequency synthe...
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| creator | KANEKAWA YOSUKE |
| description | PROBLEM TO BE SOLVED: To solve a problem of a conventional direct digital synthesizer(DDS) that is excellent as a stable variable frequency oscillating source but has caused spurious radiation in very many frequencies when the DDS is used for a reference signal source to configure a frequency synthesizer. SOLUTION: An output of the direct digital synthesizer(DDS) 1 passes through a narrow band variable frequency filter 12 before the output is given to a phase synchronous loop 10. In the case of changing the frequency of the DDS 1 to change an output frequency of a frequency synthesizer 80, a center frequency of the narrow band variable frequency filter 12 is changed in matching it. The narrow band variable frequency filter 12 eliminates spurious radiation from the DDS 1 to reduce spurious radiation included in the output of the frequency synthesizer 80. |
| format | Patent |
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SOLUTION: An output of the direct digital synthesizer(DDS) 1 passes through a narrow band variable frequency filter 12 before the output is given to a phase synchronous loop 10. In the case of changing the frequency of the DDS 1 to change an output frequency of a frequency synthesizer 80, a center frequency of the narrow band variable frequency filter 12 is changed in matching it. 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SOLUTION: An output of the direct digital synthesizer(DDS) 1 passes through a narrow band variable frequency filter 12 before the output is given to a phase synchronous loop 10. In the case of changing the frequency of the DDS 1 to change an output frequency of a frequency synthesizer 80, a center frequency of the narrow band variable frequency filter 12 is changed in matching it. 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SOLUTION: An output of the direct digital synthesizer(DDS) 1 passes through a narrow band variable frequency filter 12 before the output is given to a phase synchronous loop 10. In the case of changing the frequency of the DDS 1 to change an output frequency of a frequency synthesizer 80, a center frequency of the narrow band variable frequency filter 12 is changed in matching it. The narrow band variable frequency filter 12 eliminates spurious radiation from the DDS 1 to reduce spurious radiation included in the output of the frequency synthesizer 80.</abstract><edition>7</edition><oa>free_for_read</oa></addata></record> |
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| language | eng |
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| subjects | AUTOMATIC CONTROL, STARTING, SYNCHRONISATION, OR STABILISATIONOF GENERATORS OF ELECTRONIC OSCILLATIONS OR PULSES BASIC ELECTRONIC CIRCUITRY ELECTRICITY GENERATION OF NOISE BY SUCH CIRCUITS GENERATION OF OSCILLATIONS, DIRECTLY OR BY FREQUENCY-CHANGING,BY CIRCUITS EMPLOYING ACTIVE ELEMENTS WHICH OPERATE IN ANON-SWITCHING MANNER |
| title | FREQUENCY SYNTHESIZER |
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