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    • 45. 发明授权
    • Power amplifier module
    • 功率放大器模块
    • US06816017B2
    • 2004-11-09
    • US09931877
    • 2001-08-20
    • Kiichi YamashitaTomonori TanoueIsao OhbuKenji Sekine
    • Kiichi YamashitaTomonori TanoueIsao OhbuKenji Sekine
    • H03F152
    • H03F3/19H03F1/0261H03F1/302H03F3/347H03F2200/444
    • A power amplifier module is provided with a function of protecting an amplifying device against destruction caused by a standing wave by reflection from an antenna end in load variation. Increase in base current from idling current of a final stage amplifying portion GaAs-HBT in load variation is detected and canceled and collector current is restrained to thereby prevent an increase in output and prevent destruction of GaAs-RET. By also using a function of successively lowering idling current when power source voltage is elevated and a clipping function of diodes connected in parallel with output stage GaAs-RET, voltage as well as current more than necessary are avoided from being applied on the output stage GaAs-RET.
    • 功率放大器模块具有保护放大装置的功能,以防止由负载变化引起的天线反射引起的驻波的破坏。 检测并抵消了负载变化中的最终级放大部分GaAs-HBT的空载电流的基极电流的增加,并抑制集电极电流,从而防止输出增加并防止GaAs-RET的破坏。 通过使用在电源电压升高时连续降低空载电流并且与输出级GaAs-RET并联连接的二极管的限幅功能也被避免施加在输出级GaAs上的功能。 -RET。
    • 46. 发明授权
    • High-frequency power amplification module and radio communication device
    • 高频功率放大模块和无线通信设备
    • US06636118B1
    • 2003-10-21
    • US09914678
    • 2001-11-14
    • Cyushiro KusanoEiichi HaseHideyuki OnoOsamu KagayaYasunari UmemotoTakahiro FujitaKiichi Yamashita
    • Cyushiro KusanoEiichi HaseHideyuki OnoOsamu KagayaYasunari UmemotoTakahiro FujitaKiichi Yamashita
    • H03F304
    • H01L27/0255H03F1/52H03F3/195H03F2200/444H03F2203/21178
    • In a high frequency power amplifier module of a multi-stage structure in which a plurality of heterojunction bipolar transistors (npn-type HBTs) are cascade-connected, a protection circuit in which a plurality of pn junction diodes are connected in series is connected between the collector and emitter of each HBT. The p-side is connected to the collector side, and the n-side is connected to the emitter side. A protection circuit in which pn junction diodes of the number equal to or smaller than that of the pn junction diodes are connected in series is connected between the base and the emitter. The p-side is connected to the base side, and the n-side is connected to the emitter side. With the configuration, in the case where an overvoltage is applied across the collector and emitter due to a fluctuation in load on the antenna side, the collector terminal is clamped by an ON-state voltage of the protection circuits, so that the HBT can be prevented from being destroyed. Since the similar protection circuit is assembled between the base and emitter, even when the operator touches the module at the time of manufacturing the high frequency power amplifier module, the HBT can be prevented from being destroyed by the clamping effect of the protection circuit between the base and emitter and the protection circuit between the collector and emitter. Thus, an improved manufacturing yield of the high frequency power amplifier module and a wireless communication apparatus can be achieved, and destruction caused by fluctuation in load impedance of the wireless communication apparatus can be prevented.
    • 在其中级联多个异质结双极型晶体管(npn型HBT)的多级结构的高频功率放大器模块中,将多个pn结二极管串联连接的保护电路连接在 每个HBT的集电极和发射极。 p侧连接到集电极侧,并且n侧连接到发射极侧。 其中pn结二极管的数量等于或小于pn结二极管串联的保护电路连接在基极和发射极之间。 p侧连接到基极侧,并且n侧连接到发射极侧。 通过该结构,由于天线侧的负载的波动,在集电极和发射极两端施加过电压的情况下,集电端子被保护电路的导通状态电压钳位,HBT可以 防止被摧毁。 由于类似的保护电路组装在基极和发射极之间,即使在制造高频功率放大器模块时操作者接触模块时,也可以防止HBT被保护电路的钳位效应所破坏 基极和发射极以及集电极和发射极之间的保护电路。 因此,可以实现高频功率放大器模块和无线通信装置的制造成品率的提高,并且可以防止由无线通信装置的负载阻抗的波动引起的破坏。
    • 50. 发明授权
    • Method of searching fault locations in digital transmission line
    • 数字传输线故障位置检索方法
    • US4604745A
    • 1986-08-05
    • US578791
    • 1984-02-10
    • Yoshitaka TakasakiKiichi YamashitaYasushi Takahashi
    • Yoshitaka TakasakiKiichi YamashitaYasushi Takahashi
    • H04B17/40H04L1/24H04B3/46
    • H04L1/24H04B17/40
    • A method of searching fault locations which is employed in a transmission system comprising a transmitting terminal having a transmitter for transmitting a digital signal; a receiving terminal having a receiver for receiving the digital signal; a plurality of repeaters which are placed between the transmitting and receiving terminals, and each of which receives and amplifies the digital signal from a preceding repeater section and deliver it to a subsequent repeater section; and a plurality of transmission lines for connecting the transmitter with the first repeater, the repeaters with each other and the final repeater with each other and the final repeater with the receiver, respectively. This method comprises the steps of coding an original signal to be transmitted in terms of two kinds of error detecting codes at the transmitting terminal to send out them from the transmitter; detecting an error of a received signal using one of the two kinds of error detecting codes at each repeater thereby to measure the error rate at one repeater section corresponding to each repeater; recoding a decoded received signal using the error detecting code employed to detect the error, and delivering it to a subsequent repeater section, and transmitting signals each of which represents the error rate at each repeater section measured at each repeater, to the transmitting terminal or receiving terminal.
    • 一种搜索故障位置的方法,该传输系统包括具有用于发送数字信号的发射机的发射终端; 接收终端,具有接收数字信号的接收机; 放置在发送和接收终端之间的多个中继器,每个中继器从前一个中继器部分接收和放大数字信号,并将其传送到后续中继器部分; 以及多个传输线,用于将发射机与第一中继器连接,中继器彼此相连,最后中继器彼此相连,最后中继器分别与接收机相连。 该方法包括以下步骤:在发送终端根据两种错误检测码对要发送的原始信号进行编码,以从发送器发送出来; 使用每个中继器的两种错误检测码之一检测接收信号的误差,从而测量与每个中继器对应的一个中继器部分的错误率; 使用用于检测误差的检错码重新编码解码的接收信号,并将其传送到后续中继器部分,并且将发送信号分别表示在每个中继器测量的每个转发器部分处的错误率,发送到发送终端或接收 终奌站。