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    • 8. 发明授权
    • Receiver and gain control method
    • 接收机和增益控制方法
    • US08417203B2
    • 2013-04-09
    • US12810211
    • 2008-12-16
    • Noriaki Saito
    • Noriaki Saito
    • H04B1/06
    • H03G3/3052
    • A receiver capable of performing optimum automatic gain control responsive to a peak factor of an input signal before subjected to A/D conversion is provided in a simple configuration. A peak detector 104 is placed at the later stage of a variable gain amplifier 102, two power determiners 107 and 108 different in threshold value are used, and the amplitude density is determined in three areas separated by two threshold values PDETL and PDETH, whereby it is made possible to identify the input signal having a peak factor different in modulation system and perform optimum gain control without A/D conversion of the input signal.
    • 以简单的结构提供能够响应于进行A / D转换之前的输入信号的峰值因子来执行最佳自动增益控制的接收机。 峰值检测器104被放置在可变增益放大器102的后级,使用两个阈值不同的功率确定器107和108,并且在由两个阈值PDETL和PDETH隔开的三个区域中确定振幅密度,由此 使得能够识别具有在调制系统中不同的峰值因数的输入信号,并且在没有输入信号的A / D转换的情况下执行最佳增益控制。
    • 9. 发明授权
    • Sampling mixer, filter device, and radio device
    • 采样混频器,滤波器和无线电设备
    • US08179185B2
    • 2012-05-15
    • US13115398
    • 2011-05-25
    • Yoshifumi HosokawaNoriaki SaitoKatsuaki AbeKentaro MiyanoYasuyuki Naito
    • Yoshifumi HosokawaNoriaki SaitoKatsuaki AbeKentaro MiyanoYasuyuki Naito
    • G06G7/12
    • H03D7/125H03H15/00
    • A sampling mixer includes TAs (transconductance amplifiers), an in-phase mixer section connected to the TA and the TA, an opposite-phase mixer section connected in parallel with the in-phase mixer section, and a signal generator for generating a control signal for the in-phase mixer section and the opposite-phase mixer section respectively. The IIR filter using signals that underwent a current conversion by using the different transconductances is constructed, so that the filter characteristic can be designed by a weighting of the transconductance in addition to a capacitance ratio. As a result, the wide-band filter characteristic and the band-pass filter characteristic can be obtained, and deterioration of the receiving sensitivity can be suppressed by designing the filter characteristic suitable for the radio communication system.
    • 采样混频器包括TA(跨导放大器),连接到TA和TA的同相混频器部分,与同相混频器部分并联连接的反相混频器部分和用于产生控制信号的信号发生器 分别用于同相混合器部分和反相混合器部分。 构成使用通过使用不同的跨导进行电流转换的信号的IIR滤波器,从而除了电容比之外,可以通过加权跨导来设计滤波器特性。 结果,可以获得宽带滤波器特性和带通滤波器特性,并且可以通过设计适合于无线电通信系统的滤波特性来抑制接收灵敏度的劣化。