FREQUENCY SYNTHESIZER

PROBLEM TO BE SOLVED: To reduce the spurious of a frequency synthesizer, to widen the band of output frequency and to speed up frequency switching by using a direct digital synthesizer. SOLUTION: When an output 2 from the direct digital synthesizer(DDS) 1 is included within a frequency range capable...

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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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Zusammenfassung:	PROBLEM TO BE SOLVED: To reduce the spurious of a frequency synthesizer, to widen the band of output frequency and to speed up frequency switching by using a direct digital synthesizer. SOLUTION: When an output 2 from the direct digital synthesizer(DDS) 1 is included within a frequency range capable of reducing the generation of spurious, a switch 14 inputs the output 2 to a phase synchronizing loop 10 as a reference signal, and in the case of controlling the output 2 to a frequency range capable of increasing the spurious, the switch 14 seiects an output from a mixer 12 for mixing the output 2 in the frequency range for reducing the spurious and a signal with prescribed frequency outputted from an oscillator 13 and outputs the selected signal as a reference signal.