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    • 5. 发明授权
    • Quadrature modulation demodulation circuit
    • 正交调制解调电路
    • US08174310B2
    • 2012-05-08
    • US12861818
    • 2010-08-23
    • Shingo SakamotoKotaro Murakami
    • Shingo SakamotoKotaro Murakami
    • H03C1/00H03C3/00H03D1/00H03D3/00
    • H04L27/3863
    • A quadrature demodulation circuit includes: first to fourth mixers to receive a modulation signal; a phase shifter to supply to the first and third mixers a first local frequency signal, to supply to the second mixer a second local frequency signal having a designated phase difference relative to the first local frequency signal, and to supply to the fourth mixer a third local frequency signal that is an inverse in phase to the second local frequency signal; a first adder to add a signal output from the first mixer and a signal output from the second mixer and to output a first demodulation signal; and a second adder to add a signal output from the third mixer and a signal output from the fourth mixer and to output a second demodulation signal.
    • 正交解调电路包括:第一至第四混频器,用于接收调制信号; 向所述第一和第三混频器提供第一本地频率信号的移相器,向所述第二混频器提供具有相对于所述第一本地频率信号的指定相位差的第二本地频率信号,以及向所述第四混频器提供第三本地频率信号, 与第二本地频率信号相位相反的本地频率信号; 第一加法器,用于将从第一混频器输出的信号和从第二混频器输出的信号相加,并输出第一解调信号; 以及第二加法器,用于将从第三混频器输出的信号和从第四混频器输出的信号相加,并输出第二解调信号。
    • 7. 发明申请
    • QUADRATURE MODULATION DEMODULATION CIRCUIT
    • 二次调制解调电路
    • US20110043277A1
    • 2011-02-24
    • US12861818
    • 2010-08-23
    • Shingo SakamotoKotaro Murakami
    • Shingo SakamotoKotaro Murakami
    • H04L27/38
    • H04L27/3863
    • A quadrature demodulation circuit includes: first to fourth mixers to receive a modulation signal; a phase shifter to supply to the first and third mixers a first local frequency signal, to supply to the second mixer a second local frequency signal having a designated phase difference relative to the first local frequency signal, and to supply to the fourth mixer a third local frequency signal that is an inverse in phase to the second local frequency signal; a first adder to add a signal output from the first mixer and a signal output from the second mixer and to output a first demodulation signal; and a second adder to add a signal output from the third mixer and a signal output from the fourth mixer and to output a second demodulation signal.
    • 正交解调电路包括:第一至第四混频器,用于接收调制信号; 向所述第一和第三混频器提供第一本地频率信号的移相器,向所述第二混频器提供具有相对于所述第一本地频率信号的指定相位差的第二本地频率信号,以及向所述第四混频器提供第三本地频率信号, 与第二本地频率信号相位相反的本地频率信号; 第一加法器,用于将从第一混频器输出的信号和从第二混频器输出的信号相加,并输出第一解调信号; 以及第二加法器,用于将从第三混频器输出的信号和从第四混频器输出的信号相加,并输出第二解调信号。