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    • 45. 发明授权
    • Automatic gain control method and device
    • 自动增益控制方法及装置
    • US06847261B2
    • 2005-01-25
    • US10822365
    • 2004-04-12
    • Yasushi IwataYasufumi Ichikawa
    • Yasushi IwataYasufumi Ichikawa
    • H03G5/16H03G3/20H03G3/30H04B1/18
    • H03G3/3078H03G3/30H03G3/3052
    • A constant output signal can be achieved by controlling a gain variable amplifier 2 based on a level of an output signal which is derived by variably amplifying a receiving signal S1 (input signal). An AGC output signal S11 is detected by a detector circuit 3, then a detected voltage signal S7 is converted into a digital signal by an A/D converter 4 to output it to a CPU 5. Then, the CPU 5 generates a control signal S8 based on the detected voltage signal S7, then an A/D converter 6 converts the control signal S8 into the analogue signal, and then the signal is sent out to the gain variable amplifier 2 to execute gain control. At this time, an RSSI detector portion 9 detects an RSSI signal S10 corresponding to a transmitting signal level from the receiving signal S1, and then the CPU 5 sends out the control signal S8 stored at the time of preceding execution of the gain control when the RSSI signal S10 is reduced below a predetermined threshold value S12. In the weak received electric field strength, the control voltage for the gain variable amplifier is prevented reduction, and the proper automatic gain control can be made possible to thus achieve the good receiving characteristics.
    • 可以通过基于通过可变地放大接收信号S1(输入信号)导出的输出信号的电平来控制增益可变放大器2来实现恒定输出信号。 由检测器电路3检测AGC输出信号S11,然后通过A / D转换器4将检测到的电压信号S7转换成数字信号,将其输出到CPU 5.然后,CPU 5产生控制信号S8 基于检测到的电压信号S7,则A / D转换器6将控制信号S8转换为模拟信号,然后将该信号发送到增益可变放大器2以执行增益控制。 此时,RSSI检测部9从接收信号S1检测与发送信号电平对应的RSSI信号S10,然后CPU 5发出在执行增益控制时存储的控制信号S8 RSSI信号S10被减小到低于预定阈值S12。 在弱的接收电场强度下,防止减小增益可变放大器的控制电压,并且可以实现适当的自动增益控制,从而实现良好的接收特性。
    • 46. 发明授权
    • Automatic gain control method and apparatus, and radio communications apparatus having automatic gain control function
    • 自动增益控制方法和装置,以及具有自动增益控制功能的无线通信装置
    • US06708025B2
    • 2004-03-16
    • US09788214
    • 2001-02-16
    • Yasushi IwataYasufumi Ichikawa
    • Yasushi IwataYasufumi Ichikawa
    • H04B106
    • H03G3/30
    • At the power-on, a determination section (9) outputs a switch control signal (m) to a selector switch (7) to select the output of a sweep signal generator (6) which generates a voltage sweep signal (h) that increases from the minimum value to the maximum value of the gain control voltage range (p) at the same time, then provides the voltage sweep signal (h) to the variable gain amplifier (1), and calculates the difference (f) between the level detection value of an output signal (c) and a convergence value (e) and detects a sweep voltage value (j) obtained when (f)=0 and stores the sweep voltage value (j) into memory. After the sweep operation, the sweep voltage value (j) stored in memory is provided as a gain control signal (b) to the variable gain amplifier (1). Then the primary automatic gain control via the closed loop control system is started.
    • 在通电时,确定部分(9)将开关控制信号(m)输出到选择器开关(7),以选择产生增加的电压扫描信号(h)的扫描信号发生器(6)的输出 从增益控制电压范围(p)的最小值到最大值同时向可变增益放大器(1)提供电压扫描信号(h),并计算电平 输出信号(c)的检测值和收敛值(e),并且检测当(f)= 0时获得的扫描电压值(j)并将扫描电压值(j)存储到存储器中。 在扫描操作之后,将存储在存储器中的扫描电压值(j)作为增益控制信号(b)提供给可变增益放大器(1)。 然后开始通过闭环控制系统的主要自动增益控制。
    • 47. 发明授权
    • Piezoelectric substrate supporting structure for piezoelectric
transformer and piezoelectric transformer provided therewith
    • 压电变压器和压电变压器的压电衬底支撑结构
    • US6147439A
    • 2000-11-14
    • US102673
    • 1998-06-23
    • Shusaku TakagiMasamitsu TanakaSigeru BandoTadao SunaharaKatsuo KonoMitsunobu YoshidaYasushi Iwata
    • Shusaku TakagiMasamitsu TanakaSigeru BandoTadao SunaharaKatsuo KonoMitsunobu YoshidaYasushi Iwata
    • H01L41/053H01L41/107H01L41/047
    • H01L41/107H01L41/053
    • A piezoelectric substrate supporting structure for piezoelectric transformer is provided which, in the supporting and fixing of a piezoelectric substrate on a base plate or in an outer trim case, does not inhibit the vibration of the piezoelectric substrate, exhibits high impact resistance and enables stable supporting, is free from performance deterioration and enables simultaneously and easily performing an electrode takeoff from the piezoelectric substrate. Further, a piezoelectric transformer including the above piezoelectric substrate supporting structure is provided.The above piezoelectric substrate supporting structure for piezoelectric transformer comprises a piezoelectric substrate 30 as a constituent of piezoelectric transformer 20, which is fitted with electrodes, and conductive supporting members 10A to 10C interposed between portions of the piezoelectric substrate electrodes 34A to 34D and portions of conductive parts 50, 60 disposed on a mounted member 22, 24 for securing the piezoelectric substrate 30, wherein the conductive supporting members are composed of an elastic nonmetal material and a conductive material. Each of the conductive supporting members has its internal part or surface provided with cavities.
    • 提供了一种用于压电变压器的压电基片支撑结构,其在基板或外部装饰壳体上的压电基板的支撑和固定中不会抑制压电基板的振动,表现出高的抗冲击性,并且能够稳定地支撑 ,没有性能劣化,并且能够同时且容易地从压电基板执行电极起飞。 此外,提供了包括上述压电基板支撑结构的压电变压器。 上述压电变压器用压电基板支撑结构体包括压电基板30作为压电变压器20的组成部件,其配置有电极,并且导电支撑部件10A至10C插入在压电基板电极34A至34D的部分之间以及部分导电 设置在用于固定压电基板30的安装构件22,24上的部件50,60,其中导电支撑构件由弹性非金属材料和导电材料构成。 每个导电支撑构件具有设置有空腔的内部部件或表面。