2.1GHz Direct-Conversion GaAs Quadature Modurator IC for W-CDMA Base Station

2.1GHz Direct-Conversion GaAs Quadature Modurator IC for W-CDMA Base Station

Base station equipment in a W-CDMA system was claimed communication quality depending on RF block dynamic range. It is possible that Direct-conversion modulator enhances the system dynamic range by eliminating the intermediate frequency (IF) block. Base-band signals are directly quadrature-modulated...

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Veröffentlicht in:Denki Gakkai ronbunshi. C, Erekutoronikusu, joho kogaku, shisutemu Information and Systems, 2001/03/01, Vol.121(3), pp.574-579
Hauptverfasser: Itoh, Junji, Osako, Shinichi, Nishitsuji, Mitutu, Kunihisa, Taketo, Ishikawa, Osamu
Format: Artikel
Sprache:eng
Schlagworte:
Direct-conversion quadature modulation
Double-balance-mixer
QPSK
W-CDMA
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Beschreibung
Zusammenfassung:Base station equipment in a W-CDMA system was claimed communication quality depending on RF block dynamic range. It is possible that Direct-conversion modulator enhances the system dynamic range by eliminating the intermediate frequency (IF) block. Base-band signals are directly quadrature-modulated at radio frequency(RF), and the dynamic range depends on RF characteristic of quadrature modulator. We have developed the type of modulator to obtain modulating accuracy and low adjacent-channel power ratio (ACPR).
ISSN:0385-4221
1348-8155
DOI:10.1541/ieejeiss1987.121.3_574