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    • 43. 发明授权
    • Device and method for calibrating MIMO systems
    • 用于校准MIMO系统的设备和方法
    • US08126040B2
    • 2012-02-28
    • US12128557
    • 2008-05-28
    • Jian LiuGerd Vandersteen
    • Jian LiuGerd Vandersteen
    • H04B3/46
    • H01Q3/267H04B17/20
    • A device and method for calibrating MIMO systems are disclosed. In one aspect, a calibration circuit comprises at least a first and a second input/output port, each arranged for being connected to a different transmitter/receiver pair of a multiple input multiple output (MIMO) system. The circuit further comprises at least a third and a fourth input/output port, each arranged for being connected to a different antenna. The circuit further comprises an attenuator having a first attenuator port and a second attenuator port. The circuit further comprises a first and a second non-reciprocal switch, the first switch being arranged for establishing a connection between the first input/output port and either the third input/output port or the first attenuator port, and the second switch arranged for establishing a connection between the second input/output port and either the fourth input/output port or the second attenuator port.
    • 公开了一种用于校准MIMO系统的装置和方法。 在一个方面,校准电路包括至少第一和第二输入/输出端口,每个输入/输出端口被布置成连接到多输入多输出(MIMO)系统的不同发射器/接收器对。 该电路还包括至少一个第三和第四输入/输出端口,每个端口被布置成连接到不同的天线。 电路还包括具有第一衰减器端口和第二衰减器端口的衰减器。 电路还包括第一和第二不可逆开关,第一开关被布置成用于在第一输入/输出端口与第三输入/输出端口或第一衰减器端口之间建立连接,并且第二开关被布置为 建立第二输入/输出端口与第四输入/输出端口或第二衰减器端口之间的连接。
    • 44. 发明授权
    • Leakage current suppressing circuit and semiconductor chip
    • 泄漏电流抑制电路和半导体芯片
    • US08115535B2
    • 2012-02-14
    • US12424675
    • 2009-04-16
    • Tzu-Chien TzengTay-Her TsaurJian Liu
    • Tzu-Chien TzengTay-Her TsaurJian Liu
    • H03K3/01
    • H03K19/0008H03K19/0016
    • A leakage current suppressing circuit includes a bias generating unit and a switch unit. The bias generating unit is adapted to be coupled to a power source and an output terminal, and generates a bias voltage substantially equal to a voltage at the power source when the power source is turned on, and substantially equal to a voltage at the output terminal when the power source is turned off. The switch unit includes a first P-type transistor having a first terminal adapted to be coupled to the power source, a second terminal adapted to be coupled to the output terminal, a gate terminal, and a body terminal coupled to the bias generating unit for receiving the bias voltage therefrom.
    • 泄漏电流抑制电路包括偏置产生单元和开关单元。 偏置产生单元适于耦合到电源和输出端子,并且当电源接通时产生基本上等于电源电压的偏置电压,并且基本上等于输出端子处的电压 当电源关闭时。 开关单元包括第一P型晶体管,其具有适于耦合到电源的第一端子,适于耦合到输出端子的第二端子,栅极端子和耦合到偏置产生单元的主体端子,用于 从其接收偏置电压。
    • 45. 发明申请
    • Resonant Optical Amplifier
    • 谐振光放大器
    • US20120026579A1
    • 2012-02-02
    • US12846810
    • 2010-07-29
    • Jian LiuPeng WanLihmei Yang
    • Jian LiuPeng WanLihmei Yang
    • H01S3/094
    • H01S3/0621H01S3/10092H01S3/1608H01S3/17H01S3/2325H01S5/50
    • Methods and systems for resonant optical amplification are disclosed, including generating electromagnetic radiation from a seed laser; coupling the seed laser electromagnetic radiation into an etalon, wherein the etalon comprises a gain medium comprising a gain, a length, and a roundtrip gain, wherein the gain medium is positioned between a first reflective surface comprising a first power reflectivity and a second reflective surface comprising a second power reflectivity; optically or electrically pumping the gain medium using a flash lamp, an arc lamp, a laser, an electric glow discharge, or an electric current to generate an amplified seed laser electromagnetic radiation; and coupling out the amplified seed laser electromagnetic radiation from the etalon. Other embodiments are described and claimed.
    • 公开了用于共振光学放大的方法和系统,包括从种子激光器产生电磁辐射; 将种子激光电磁辐射耦合到标准具中,其中所述标准具包括增益介质,所述增益介质包括增益,长度和往返增益,其中所述增益介质位于包括第一功率反射率的第一反射表面和第二反射表面之间 包括第二功率反射率; 使用闪光灯,弧光灯,激光,电辉光放电或电流对增益介质进行光学或电泵浦,以产生放大的种子激光电磁辐射; 并且从标准具耦合放大的种子激光电磁辐射。 描述和要求保护其他实施例。
    • 46. 发明授权
    • 810 nm ultra-short pulsed fiber laser
    • 810 nm超短脉冲光纤激光器
    • US08073019B2
    • 2011-12-06
    • US12715596
    • 2010-03-02
    • Jian LiuLihmei Yang
    • Jian LiuLihmei Yang
    • H01S3/30H01S3/00
    • H01S3/2308H01S3/0057H01S3/0092H01S3/06754H01S3/094092H01S3/1616H01S2302/00
    • Methods and systems for generating ultra-short fiber laser pulses are disclosed, including generating a signal laser pulse from a seed fiber laser; using a pulse stretcher comprising an input and an output, wherein the signal laser pulse is coupled into the input of the pulse stretcher; using a Tm:ZBLAN fiber comprising an input and an output, wherein the stretched signal laser pulse from the output of the pulse stretcher is coupled into the input of the Tm:ZBLAN fiber; using a pump laser coupled to either the output or the input of the Tm:ZBLAN fiber to amplify the stretched signal laser pulse; and using a compressor comprising an input and an output, wherein the output of the Tm:ZBLAN fiber is coupled to the input of the compressor and the output of the compressor emits the amplified signal laser pulse. Other embodiments are described and claimed.
    • 公开了用于产生超短纤维激光脉冲的方法和系统,包括从种子光纤激光器产生信号激光脉冲; 使用包括输入和输出的脉冲展开器,其中所述信号激光脉冲被耦合到所述脉冲展开器的输入中; 使用包括输入和输出的Tm:ZBLAN纤维,其中来自所述脉冲展开器的输出的拉伸信号激光脉冲耦合到所述Tm:ZBLAN纤维的输入中; 使用耦合到Tm:ZBLAN光纤的输出或输入的泵浦激光器来放大拉伸的信号激光脉冲; 以及使用包括输入和输出的压缩器,其中所述Tm:ZBLAN纤维的输出耦合到所述压缩机的输入端,并且所述压缩器的输出发射所述放大的信号激光脉冲。 描述和要求保护其他实施例。