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专利名称：Quadrature demodulator
发明人：Sadatoshi Oishi,Nobuo Murofushi,Masakazu
Kato
申请号：US11881876申请日：20070730公开号：US07619466B2公开日：20091117
专利附图：
摘要：A quadrature demodulator includes a reception section which receives a signaltransmitted by an RFID tag and containing a specific pattern and data following thespecific pattern and multiplies the reception signal by a local signal to generate an I-
signal, while multiplying the reception signal by the local signal shifted in phase by 90degrees to generate a Q-signal, a first demodulating circuit which squares the I- and Q-signals and adding the resulting I- and Q-signals together to generate data on the basisof the addition result, a second demodulating circuit which detects the specific pattern inthe I- and Q-signals to decode the data following one of the detected specific patterns,and a control section which selects one of the first and second demodulating circuits inaccordance with a gain determined by the result of the addition between the values ofthe squared I- and Q-signals.
申请人：Sadatoshi Oishi,Nobuo Murofushi,Masakazu Kato
地址：Fuji JP,Susono JP,Numazu JP
国籍：JP,JP,JP
代理机构：Harness, Dickey & Pierce, P.L.C.
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