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专利名称：Wide-band baseband 90 phase shifting
circuit and FSK radio receiver having thesame
发明人：Ohba, Motoi,Hasegawa, Makoto,Makimoto,
Mitsuo
申请号：EP901162.1申请日：19900824公开号：EP0417528A3公开日：19940209
专利附图：
摘要：An FSK radio receiver of direct conversion type, which derives baseband in-phase
and phase quadrature signals from a received FSK RF signal in respective mixers byapplying local oscillator signals to the mixers differing in phase by 90, in which wide-bandbaseband 90 phase shifting circuits formed of only digital logic elements (11, 14), (13, 12)phase shift the in-phase and phase quadrature signals to enable a demodulated digitaldata signal to be obtained by subsequent digital processing. In that processing, signalshaving a frequency that is double that of the in-phase and phase quadrature signals arederived and used to derive the demodulated data signal, ensuring high accuracy ofdetection and lowering the accuracy required for the local oscillator frequency.
申请人：MATSUSHITA ELECTRIC INDUSTRIAL CO., LTD.
地址：1006, Oaza Kadoma Kadoma-shi, Osaka-fu, 571 JP
国籍：JP
代理机构：Pellmann, Hans-Bernd, Dipl.-Ing.
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