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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Bibliographische Detailangaben
1. Verfasser:	KANEKAWA YOSUKE
Format:	Patent
Sprache:	eng
Schlagworte:	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
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Beschreibung
Zusammenfassung:	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.