公开(公告)号：US06288619B1

公开(公告)日：2001-09-11

申请号：US09578465

申请日：2000-05-25

申请人： Yukinori Hirai ,  Yasuyuki Honma

发明人： Yukinori Hirai ,  Yasuyuki Honma

IPC分类号： H03C300

CPC分类号： H04L27/206 ,  H03C3/40 ,  H04L25/06

摘要： In a bias circuit for use in a quadrature modular, the bias circuit comprises a bias stabilizing resister having a resistance value which is substantially equal to as impedance value of an output impedance of a low pass filter through which an input signal is supplied to the bais circuit. The bias stabilizing resistor is disposed between first and second nodes for producing a noninverted signal and an inverted signal, respectively. The input signal is supplied to the first node through an input capacitor. A ground potential is supplied to the second node through a ground capacitor. The bias circuit comprises a first resistor between a power supply terminal and the first node, a second resistor between a power supply terminal and the first node, a third resistor between the first node a ground terminal, and a forth resistor between the second node and the ground terminal.

摘要翻译： 在用于正交模块的偏置电路中，偏置电路包括偏置稳定电阻器，其具有基本上等于低通滤波器的输出阻抗的阻抗值的电阻值，通过该阻抗值将输入信号提供给bais 电路。 偏置稳定电阻器设置在第一和第二节点之间，用于分别产生非反相信号和反相信号。 输入信号通过输入电容器提供给第一个节点。 接地电位通过接地电容器提供给第二节点。 偏置电路包括电源端子和第一节点之间的第一电阻器，电源端子和第一节点之间的第二电阻器，第一节点与接地端子之间的第三电阻器，以及第二节点与第二节点之间的第四电阻器 地面终端。

公开(公告)号：US06549760B1

公开(公告)日：2003-04-15

申请号：US09295861

申请日：1999-04-21

申请人： Yasuyuki Honma ,  Yukinori Hirai

发明人： Yasuyuki Honma ,  Yukinori Hirai

IPC分类号： H03C702

CPC分类号： H04B7/0808

摘要： A communications device for communicating by selecting a predetermined antenna from a plurality of antennae has a first and a second switch, each switch comprising one moving contact and two fixed contacts. The moving contact of the first switch is connected to a first antenna, the first fixed contact of the first switch is connected to a transmitter circuit, the second fixed contact of the first switch is connected to the first fixed contact of the second switch, the moving contact of the second switch is connected to a receiver circuit, and the second fixed contact of the second switch is connected to a second antenna. By switching as appropriate between antennae the attenuation of transmission and reception signals caused by the switches can be reduced.

摘要翻译： 用于通过从多个天线中选择预定天线进行通信的通信设备具有第一和第二开关，每个开关包括一个移动触点和两个固定触点。 第一开关的移动触点连接到第一天线，第一开关的第一固定触点连接到发送器电路，第一开关的第二固定触点连接到第二开关的第一固定触点， 第二开关的移动触点连接到接收器电路，并且第二开关的第二固定触点连接到第二天线。 通过适当地在天线之间进行切换，可以减少由开关引起的发送和接收信号的衰减。