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13 条记录 (耗时 0.027 秒)

    Wireless terminal device
    1.
    发明授权
    Wireless terminal device 失效
    无线终端设备

    公开(公告)号：US07054610B1

    公开(公告)日：2006-05-30

    申请号：US09694675

    申请日：2000-10-24

    申请人： Kenji Itoh ,  Hiroaki Nagano ,  Takatoshi Katsura ,  Shinjirou Fukuyama ,  Mitsuru Mochizuki ,  Yoshinori Matsunami ,  Mitsuhiro Shimozawa ,  Fumio Ishizu ,  Ryoji Hayashi

    发明人： Kenji Itoh ,  Hiroaki Nagano ,  Takatoshi Katsura ,  Shinjirou Fukuyama ,  Mitsuru Mochizuki ,  Yoshinori Matsunami ,  Mitsuhiro Shimozawa ,  Fumio Ishizu ,  Ryoji Hayashi

    IPC分类号： H04B1/30

    CPC分类号： H03D7/1408 ,  H04B1/30

    摘要： In a cellular telephone provided with a receiving circuit of a direct conversion type, a passive low-pass filter is arranged between a mixer for an I-channel and a base band circuit for removing interference waves of or above a channel next to a channel neighboring to the I-channel, and another passive low-pass filter is arranged between a mixer for a Q-channel and the base band circuit for removing interference waves of or above a channel next to a channel neighboring to the Q-channel. Since the low-pass filters for removing the interference waves of or above the channel next to the neighboring channel are of a differential type, the circuit scale can be small, and the power consumption is small. Since the interference waves are removed by the passive low-pass filters and the active low-pass filters, only the desired channel can be reliably received.

    摘要翻译： 在设置有直接转换型接收电路的蜂窝电话中，无源低通滤波器被布置在用于I信道的混频器和用于去除邻近信道旁边的信道上的干扰波的基带电路之间 并且另一个无源低通滤波器被布置在用于Q信道的混频器和用于去除邻近于Q信道的信道旁边的信道上的干扰波的基带电路之间。 由于用于除去邻近通道旁边的通道或其上方的干扰波的低通滤波器是差分型，所以电路规模可以小，功耗小。 由于无源低通滤波器和有源低通滤波器去除了干扰波，所以只能可靠地接收期望的信道。

    Wireless terminal device
    3.
    发明授权
    Wireless terminal device 失效
    无线终端设备

    公开(公告)号：US06721543B1

    公开(公告)日：2004-04-13

    申请号：US09694671

    申请日：2000-10-24

    申请人： Takatoshi Katsura ,  Kenji Itoh ,  Shinjirou Fukuyama ,  Mitsuru Mochizuki ,  Hiroaki Nagano ,  Yoshinori Matsunami

    发明人： Takatoshi Katsura ,  Kenji Itoh ,  Shinjirou Fukuyama ,  Mitsuru Mochizuki ,  Hiroaki Nagano ,  Yoshinori Matsunami

    IPC分类号： H04Q700

    CPC分类号： H04B1/52 ,  H04B1/48

    摘要： A wireless terminal device includes a transmitting circuit, an isolator, a band pass filter, a switch, a transmitting antenna, a receiving circuit, a band pass filter, a switch, a receiving antenna, a high-pass filter, a low-pass filter and an input/output port. A transmission wave of a frequency is conveyed from the transmitting circuit to the input/output port via the isolator, the band pass filter and the low pass filter, and further to a vehicle antenna. Here, the transmission wave in the direction towards the receiving circuit is blocked by the high-pass filter. On the other hand, a reception wave of a frequency is conveyed from the vehicle antenna to the input/output port, and to the receiving circuit via the high-pass filter and the band pass filter. Here, the reception wave in the direction towards the transmitting circuit is blocked by the low-pass filter. Thus, transmission and reception can simultaneously be performed via a single input/output port, so that the wireless terminal device of the invention is compatible with a general wireless terminal device which performs simultaneous transmission/reception by one transmitting/receiving share antenna.

    摘要翻译： 无线终端装置包括发送电路，隔离器，带通滤波器，开关，发送天线，接收电路，带通滤波器，开关，接收天线，高通滤波器，低通滤波器 滤波器和输入/输出端口。 频率的传输波通过隔离器，带通滤波器和低通滤波器从发射电路传送到输入/输出端口，并且进一步传输到车辆天线。 这里，朝向接收电路的方向的发送波被高通滤波器阻挡。 另一方面，频率的接收波从车载天线传送到输入/输出端口，并经由高通滤波器和带通滤波器传送到接收电路。 这里，朝向发送电路的方向的接收波被低通滤波器阻挡。 因此，可以通过单个输入/输出端口同时进行发送和接收，使得本发明的无线终端设备与通过一个发送/接收共享天线同时发送/接收的一般无线终端设备兼容。

    Wireless terminal device
    6.
    发明授权
    Wireless terminal device 失效
    无线终端设备

    公开(公告)号：US06683925B1

    公开(公告)日：2004-01-27

    申请号：US09694678

    申请日：2000-10-24

    申请人： Takatoshi Katsura ,  Kenji Itoh ,  Shinjirou Fukuyama ,  Mitsuru Mochizuki ,  Hiroaki Nagano ,  Yoshinori Matsunami ,  Fumio Ishizu ,  Ryoji Hayashi

    发明人： Takatoshi Katsura ,  Kenji Itoh ,  Shinjirou Fukuyama ,  Mitsuru Mochizuki ,  Hiroaki Nagano ,  Yoshinori Matsunami ,  Fumio Ishizu ,  Ryoji Hayashi

    IPC分类号： H04L2708

    CPC分类号： H03G3/001

    摘要： A level of a base band signal at an input side of a variable gain amplification circuit is detected by a logarithmic amplifier having a wide input voltage range at a start of an operation, a control unit then performs a coarse feedforward control on a gain of the variable gain amplifier based on the detected level and finds a level of an output of an A/D converter by a mean square deriving circuit and inputs the resulting signal to the control unit. Then the control unit performs a fine feedback control on the variable gain amplifier based on the detected level.

    摘要翻译： 在可变增益放大电路的输入侧的基带信号的电平由操作开始时具有宽的输入电压范围的对数放大器检测，然后控制单元对该增益进行粗略的前馈控制 基于检测电平的可变增益放大器，并通过均方推导电路找到A / D转换器的输出电平，并将所得到的信号输入到控制单元。 然后，控制单元基于检测到的电平对可变增益放大器执行精细反馈控制。