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    • 2. 发明授权
    • Costas loop carrier wave reproducing circuit
    • COSTAS环路载波波形再现电路
    • US5086241A
    • 1992-02-04
    • US727944
    • 1991-07-10
    • Isao Nakayama
    • Isao Nakayama
    • H04L27/00H04L27/227
    • H04L27/2273H04L2027/0061H04L2027/0091
    • A Costas loop carrier wave reproducing circuit includes a first differential amplifier circuit, a second differential amplifier circuit, a multiplying circuit, a first square circuit, a second circuit, and a double-balanced differential amplifier circuit. The first differential amplifier circuit obtains an inphase output from an inphase demodulated signal obtained by performing synchronous detection of a component inphase with a four-phase modulated wave. The second differential amplifier circuit obtains an orthogonal output from an orthogonal demodulated signal obtained by performing synchronous detection of an orthogonal component of the four-phase modulated wave. The multiplying circuit multiplies outputs from the first and second differential amplifier circuits. The first square circuit obtains a square output of an output from the first differential amplifier circuit. The second square circuit obtains a square output of an output from the second differential amplifier circuit. The double-balanced differential amplifier circuit obtains an output difference between the first and second square circuits and outputting a product of the output difference and an output from the multiplying circuit as a PLL control signal.