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    • 10. 发明授权
    • Circuit for correcting pass band flatness
    • 用于校正通带平坦度的电路
    • US06678511B2
    • 2004-01-13
    • US09781434
    • 2001-02-13
    • Hee Yong HwangSang Won Yoon
    • Hee Yong HwangSang Won Yoon
    • H04B126
    • H03H7/0115H03H7/1775
    • A pass band flatness correction circuit for improving flatness of a ripple occurring within a pass band in a band pass filter and a mobile telecommunication repeater system is provided. The pass band flatness correction circuit includes a complementary band pass filter having a pass band transfer characteristic producing a counter-ripple of a reverse shape to a ripple in a pass band of a main band pass filter, for flattening a total of pass band transfer characteristics of a filtering system, an amplifier circuit for enhancing an increase in a filter insertion loss, and an attenuator circuit for enhancing a reflection loss characteristic of the whole circuit. The flatness and a stop band attenuation characteristic of the band pass filter whose pass band flatness is distorted and a repeater system employing the band pass filter is enhanced, to thereby improve performance and speech quality of a mobile telecommunication service.
    • 提供了一种用于提高带通滤波器和移动通信中继器系统中的通带内产生纹波的平坦度的通带平坦度校正电路。 通带平坦度校正电路包括具有通带传输特性的互补带通滤波器,其产生与主带通滤波器的通带中的纹波相反的反向纹波,用于使总带宽传输特性平坦化 滤波器系统,用于增强滤波器插入损耗增加的放大器电路,以及用于增强整个电路的反射损耗特性的衰减器电路。 通带失真的带通滤波器的平坦度和阻带衰减特性得到增强,并且提高了使用带通滤波器的中继器系统,从而提高了移动电信业务的性能和语音质量。