DIGITAL SIGNAL MODULATOR

DIGITAL SIGNAL MODULATOR

PROBLEM TO BE SOLVED: To provide the digital signal modulator that realizes low spurious output. SOLUTION: The digital signal modulator is provided with an input terminal 1 that receives digital data, an I/Q signal generating circuit 2, a low pass filter 3, a local oscillation circuit 4, a quadratur...

Ausführliche Beschreibung

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Bibliographische Detailangaben
Hauptverfasser: KITAMURA KOICHI, KANI NOBUHIRO, KITAMURA HIDEYA
Format: Patent
Sprache:eng
Schlagworte:
ELECTRIC COMMUNICATION TECHNIQUE
ELECTRICITY
TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHICCOMMUNICATION
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Beschreibung
Zusammenfassung:PROBLEM TO BE SOLVED: To provide the digital signal modulator that realizes low spurious output. SOLUTION: The digital signal modulator is provided with an input terminal 1 that receives digital data, an I/Q signal generating circuit 2, a low pass filter 3, a local oscillation circuit 4, a quadrature digital modulation circuit 5, a power amplifier circuit 8, band pass filters and an output terminal 13. The band pass filter is selected from a band pass filter 10 or 12 whose pass band differs based on an oscillation frequency outputted from the local oscillation circuit 4. Thus, low spurious output is realized.