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    • 4. 发明申请
    • Communication device
    • 通讯设备
    • US20060165199A1
    • 2006-07-27
    • US10532354
    • 2003-06-03
    • Makoto TakemotoDaichi ImamuraHiroaki Sudo
    • Makoto TakemotoDaichi ImamuraHiroaki Sudo
    • H04L1/02H04L27/08
    • H04B7/0865
    • It is an object of the invention to provide a communication apparatus that can perform gain control without deteriorating an S/N ratio of signals after diversity processing. A communication apparatus according to the invention includes: a comparison unit (11) that compares gain set values calculated and outputted by AGC control units (10a) and (10b) of respective branches; and conversion units (1004a) and (1004b) that generate gain adjustment signals corresponding to the respective branches from the gain set values obtained by the comparison unit (11). The communication apparatus performs gain control for variable gain amplifiers (5a) and (5b) of the respective branches according to the gain adjustment signals from the conversion units (1004a) and (1004b).
    • 本发明的一个目的是提供一种可以进行增益控制而不降低分集处理之后的信号的S / N比的通信装置。 根据本发明的通信装置包括:比较单元(11),其比较由各个分支的AGC控制单元(10a)和(10b)计算和输出的增益设定值; 以及从由比较单元(11)获得的增益设定值生成与各个分支对应的增益调整信号的转换单元(1004a)和(1004b)。 通信装置根据来自转换单元(1004a)和(1004b)的增益调整信号,对各个分支的可变增益放大器(5a)和(5b)进行增益控制。
    • 10. 发明授权
    • Frequency conversion circuit and mixing circuit including the same
    • 变频电路和混频电路包括相同
    • US5448197A
    • 1995-09-05
    • US191527
    • 1994-02-04
    • Morikazu SagawaKazuaki TakahashiKouei MisaizuMakoto Takemoto
    • Morikazu SagawaKazuaki TakahashiKouei MisaizuMakoto Takemoto
    • H03D7/12H04B1/26H04B1/28H03B19/00
    • H03D7/125
    • A frequency conversion circuit for mixing first and second frequency signals to supply an output frequency signal comprises: first and second FETs having first and second gates for receiving the first and second frequency signals respectively; and a third FET having a third gate ac-grounded, the first to third FETs being connected in series such that a current flowing through the current circuit between the source and drain is controlled by the first to third gates, the third FET being provided between the first and second FETs. The third FET may also be provided between connection an end of the series connector and the second FET in accordance with frequency differences between the first and second frequency signals and between the second frequency signal and the output frequency signal. A triple gate FET can be used in place of these three FETs connected in series. A quad gate FET can be used also. A mixing circuit including the frequency conversion circuit mentioned above is also disclosed.
    • 一种用于混合第一和第二频率信号以提供输出频率信号的频率转换电路包括:具有分别用于接收第一和第二频率信号的第一和第二门的第一和第二FET; 以及具有第三栅极交流接地的第三FET,所述第一至第三FET串联连接,使得流过所述源极和漏极之间的电流电路的电流由所述第一至第三栅极控制,所述第三FET设置在 第一和第二FET。 第三FET也可以根据第一和第二频率信号之间以及第二频率信号和输出频率信号之间的频率差在串联连接器的端部和第二FET之间的连接之间提供。 可以使用三栅极FET来代替串联连接的这三个FET。 也可以使用四极FET。 还公开了包括上述变频电路的混合电路。