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    • 2. 发明授权
    • Transceiver circuits for TDMA system with variable frequency second
local oscillator
    • 用于具有可变频率第二本地振荡器的TDMA系统的收发器电路
    • US5987309A
    • 1999-11-16
    • US668360
    • 1996-06-26
    • Hisashi AdachiHiroaki KosugiYouichi MorinagaToshio Obara
    • Hisashi AdachiHiroaki KosugiYouichi MorinagaToshio Obara
    • H03L7/18H03D7/16H04B1/40H04B1/56
    • H04B1/408H03D7/161H04B1/56
    • A transceiver circuit with a heterodyne receiver circuit is provided. Output signals of first and second local oscillator 103, 104 are mixed by a local frequency converter 105. An output signal of the converter 105 passes a filter 106 and inputs a modulator 111 of a transmitter circuit 101 as well as a first frequency converter 122 of a receiver circuit 102. The second local oscillator 104 comprises a frequency synthesizer whose output signal varies for a transmission or a receiving mode. The output signal of the second local oscillator 104 also inputs the second frequency converter 124 of the receiving mode. A reference frequency of the second local oscillator 104 is set higher than a frequency step between communication channels so that a quick switching of the frequency is performed. Thus, the transceiver circuit of this invention is suitable for a compact size and hardly generates unwanted spurious components at transmission mode.
    • 提供了一种具有外差接收电路的收发电路。 第一和第二本地振荡器103,104的输出信号由本地变频器105混合。转换器105的输出信号通过滤波器106并输入发射机电路101的调制器111以及第一变频器122 接收机电路102.第二本地振荡器104包括频率合成器,其输出信号对于发射或接收模式而变化。 第二本地振荡器104的输出信号也输入接收模式的第二频率转换器124。 第二本地振荡器104的参考频率被设置为高于通信信道之间的频率步长,使得执行频率的快速切换。 因此,本发明的收发器电路适用于紧凑的尺寸,并且在传输模式下几乎不产生不想要的杂散分量。
    • 5. 发明申请
    • Antenna selection diversity apparatus and receiving method
    • 天线选择分集装置和接收方法
    • US20060234776A1
    • 2006-10-19
    • US10544388
    • 2004-11-04
    • Yoshiharu IshiharaYasushi IwataToshio Obara
    • Yoshiharu IshiharaYasushi IwataToshio Obara
    • H04B1/02H04M1/00H04B7/02
    • H04B7/0874
    • An antenna selection diversity apparatus capable of shortening, when antennas are switched in frame units, a measuring time of antennas and shortening the time of selecting an optimal antenna from among a plurality of antennas on standby. In this apparatus, an antenna selection section (109) selects one of three antennas as an antenna in actual use for a period of a plurality of frames consecutively according to selection priority stored in an antenna information storage section (108) and gives an instruction for selecting one of two antennas on standby as an antenna to be measured once at a period of a plurality of frames to an antenna selection switch (104). When the reception level of the antenna in actual use measured by a reception level measuring section (107) falls below the reception level of the antenna to be measured a predetermined number of times consecutively, the antenna selection section (109) gives an instruction for selecting the antenna to be measured as the antenna in actual use to the antenna selection switch (104).
    • 一种天线选择分集装置,其能够在天线以帧为单位进行切换时缩短天线的测量时​​间,并且缩短从待机状态的多个天线中选择最佳天线的时间。 在该装置中,天线选择部(109)根据存储在天线信息存储部(108)中的选择优先级,连续选择多个帧的周期的实际使用中的三个天线中的一个天线,并给出指令 选择待机状态下的两个天线中的一个天线作为在多个帧的周期被测量一次的天线到天线选择开关(104)。 当由接收电平测量部分(107)测量的实际使用的天线的接收电平连续地下降到预定次数以下的待测天线的接收电平时,天线选择部(109)给出选择指令 要测量的天线作为实际使用的天线到天线选择开关(104)。
    • 6. 发明授权
    • Radio communication device that meets a plurality of frequency bands
    • 满足多个频带的无线通信装置
    • US07079817B2
    • 2006-07-18
    • US10526952
    • 2004-01-30
    • Toshio ObaraTakashi MiuraHidenori Matsumoto
    • Toshio ObaraTakashi MiuraHidenori Matsumoto
    • H04B1/38
    • H04B1/50
    • It is an object of the present invention to switch bands with a simple structure in which frequency bands can be individually switched respectively in a transmission and a reception and only a receiving part can be switched to another frequency band without disconnecting an upward line during communication.The device of the invention includes an antenna (1) capable of transmitting and receiving radio waves of first and second frequency bands, a wave separator (2), antenna sharing devices (3A, 3B) respectively provided so as to correspond to the frequency bands, transmitting circuits (4A, 4B), transmitting PLL synthesizers (5A, 5B), receiving circuits (6A, 6B) and receiving PLL synthesizers (7A, 7B). A control part 102 controls, through a common three-line serial bus, the transmitting PLL synthesizers (5A, 5B), the receiving PLL synthesizers (7A, 7B), a transmitting band switching signal generating circuit (8) and a receiving band switching signal generating circuit (9) to individually switch the frequency bands respectively in the transmission and the reception.
    • 本发明的目的是以简单的结构切换频带,其中频带可以在传输和接收中分别单独切换,并且只有接收部分可以切换到另一个频带,而不会在通信期间断开上行线路。 本发明的装置包括能够发送和接收第一和第二频带的无线电波的天线(1),分波器(2),天线共享装置(3A,3B),分别设置为对应于 频带,发送电路(4A,4B),发送PLL合成器(5A,5B),接收电路(6A,6B)和接收PLL合成器(7A,7B)。 控制部分102通过公共三线串行总线控制发送PLL合成器(5A,5B),接收PLL合成器(7A,7B),发送频带切换信号发生电路(8)和 接收频带切换信号发生电路(9),用于分别在发送和接收中切换频带。
    • 8. 发明授权
    • Transmission electric power control device and control method
    • 传动电力控制装置及控制方法
    • US06526266B1
    • 2003-02-25
    • US09208120
    • 1998-12-09
    • Toshio Obara
    • Toshio Obara
    • H04Q720
    • H03G3/3042
    • A transmission electric power control device includes: a coupler 12, detector 13, electric power amplifier 14, error detection means 15, target value generation means 16, gain variable means 17, control calculation means 18, control calculation parameter generation means 19, modulator 20, control variable addition means 21, transmission electric power control means 22, and transmission electric power designation means 23. In this case, the automatic transmission electric power control feedback loop includes: the coupler 12, detector 13, error detection means 15, control calculation means 18, control calculation parameter generation means 19, transmission electric power designation means 23, control variable addition means 21 and gain variable means 17. When the control calculation parameter in the automatic transmission electric power control feedback loop is made variable according to the transmission electric power designation information and also when the convergence offset value of the loop response characteristic is made variable, it is possible to conduct an electric power control of a high dynamic range, high linearity and high accuracy even if the electric power source control of the electric amplifier is conducted for each transmission electric power and the gate bias control is conducted.
    • 传输电力控制装置包括:耦合器12,检测器13,电功率放大器14,误差检测装置15,目标值产生装置16,增益可变装置17,控制计算装置18,控制计算参数产生装置19,调制器20 控制变量加法单元21,变速器电力控制单元22以及变速器电力指定单元23.在这种情况下,自动变速器电力控制反馈回路包括:耦合器12,检测器13,误差检测单元15,控制运算 装置18,控制计算参数产生装置19,传输电力指定装置23,控制可变加法装置21和增益​​可变装置17.当根据传输电气使自动变速器电力控制反馈回路中的控制计算参数可变时 功率指定信息以及收敛偏移值时 环路响应特性变化,即使对于每个发送电力和栅极偏置进行电动放大器的电力源控制,也可以进行高动态范围,高线性度和高精度的电力控制 进行控制。