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    • 3. 发明申请
    • WIDEBAND LOW-NOISE AMPLIFIER
    • 宽带低噪声放大器
    • US20100066452A1
    • 2010-03-18
    • US12595163
    • 2008-05-16
    • Munenari KawashimaYo YamaguchiKazuhiro UeharaKenjiro Nishikawa
    • Munenari KawashimaYo YamaguchiKazuhiro UeharaKenjiro Nishikawa
    • H03F1/34
    • H03F1/34H03F1/26H03F1/42H03F1/56H03F3/19H03F2200/108H03F2200/144H03F2200/151H03F2200/222H03F2200/294H03F2200/36H03F2200/451
    • A wideband low-noise amplifier of the present invention is designed such that an input terminal is connected to a base of a first transistor, one terminal of a first passive element, and one terminal of a third passive element; an emitter of the first transistor is grounded; a collector of the first transistor is connected to an output terminal, a base of a second transistor, one terminal of a capacitor, and one terminal of a second passive element; the other terminal of the first passive element is connected to the other terminal of the capacitor; an emitter of the second transistor is connected to the other terminal of the third passive element; and a power terminal is connected to a collector of the second transistor and the other terminal of the second passive element, wherein impedance of the third passive element is determined based on impedance of the first transistor whose emitter size is determined to suite desired saturation level of amplification, thus establishing input impedance matching.
    • 本发明的宽带低噪声放大器被设计成使得输入端子连接到第一晶体管的基极,第一无源元件的一个端子和第三无源元件的一个端子; 第一晶体管的发射极接地; 第一晶体管的集电极连接到输出端子,第二晶体管的基极,电容器的一个端子和第二无源元件的一个端子; 第一无源元件的另一个端子连接到电容器的另一个端子; 第二晶体管的发射极连接到第三无源元件的另一个端子; 并且电源端子连接到所述第二晶体管的集电极和所述第二无源元件的另一端子,其中所述第三无源元件的阻抗基于所述第一晶体管的阻抗来确定,所述第一晶体管的发射极尺寸被确定为将所需的饱和电平 放大,从而建立输入阻抗匹配。
    • 7. 发明申请
    • Wideband ultra low noise amplifier
    • 宽带超低噪声放大器
    • US20070216486A1
    • 2007-09-20
    • US11377824
    • 2006-03-16
    • Aly IsmailEdward Youssoufian
    • Aly IsmailEdward Youssoufian
    • H03F1/22
    • H03F1/26H03F1/223H03F1/342H03F3/193H03F2200/151H03F2200/294H03F2200/372H03F2200/451H03F2200/72
    • A circuit and method of reducing noise in the circuit comprises a first transistor and an amplifier operatively connected to the first transistor, wherein the amplifier comprises a plurality of transistors and is adapted to amplify an input signal, and wherein the input signal is differentially captured at an output of the first transistor and the amplifier. Preferably, the plurality of transistors comprises a second transistor and a third transistor. Furthermore, a noise level of the first transistor and the third transistor are preferably cancelled. The size of the second transistor may be approximately 1/50Ω. Preferably, a gain on an amplifier stage formed by the second transistor and the third transistor is adapted to be increased. Moreover, an equivalent transconductance of the amplifier is preferably independent of an impedance matching on the amplifier. Preferably, a noise figure level of the circuit is less than approximately 1 dB.
    • 降低电路噪声的电路和方法包括第一晶体管和可操作地连接到第一晶体管的放大器,其中放大器包括多个晶体管,并且适于放大输入信号,并且其中输入信号在 第一晶体管和放大器的输出。 优选地,多个晶体管包括第二晶体管和第三晶体管。 此外,优选地消除第一晶体管和第三晶体管的噪声电平。 第二晶体管的尺寸可以是大约1 / 50Omega。 优选地,由第二晶体管和第三晶体管形成的放大器级的增益适于增加。 此外,放大器的等效跨导优选地与放大器上的阻抗匹配无关。 优选地,电路的噪声系数电平小于约1dB。
    • 8. 发明申请
    • Power amplification circuit and communication device using the same
    • 功率放大电路和通信设备使用相同
    • US20040189379A1
    • 2004-09-30
    • US10706138
    • 2003-11-13
    • Sharp Kabushiki Kaisha
    • Keiichi Sakuno
    • H03F001/36
    • H03F1/34H03F2200/151H03F2200/372
    • A power amplification circuit, and a communication device using the same, which are capable of suppressing gain decreases of a power amplifier due to increases in input signal power in a state near the saturation operation, capable of reducing its size, and low in distortion and high in efficiency. The power amplification circuit includes a power amplifier and a negative feedback circuit connected between a signal input terminal and a signal output terminal of the power amplifier. Impedance of the negative feedback circuit depends on a signal voltage occurring across the negative feedback circuit. By adjusting the characteristic that the negative feedback quantity of the negative feedback circuit to the power amplifier is variable depending on input signal power, gain fluctuations of the power amplifier due to increases or decreases of input signal power or output signal power around a specified output signal power are suppressed.
    • 功率放大电路及其使用方法的功能放大电路能够抑制在饱和运算附近的状态下由于输入信号功率的增加导致的功率放大器的增益减小,能够减小其尺寸,并且具有低的失真和 效率高 功率放大电路包括功率放大器和连接在功率放大器的信号输入端子和信号输出端子之间的负反馈电路。 负反馈电路的阻抗取决于负反馈电路两端产生的信号电压。 通过调整负值反馈电路对功率放大器的负反馈量根据输入信号功率而变化的特性,由于输入信号功率的增减或输出信号功率在指定输出信号周围的增益波动 权力被抑制
    • 9. 发明申请
    • Power amplification circuit and communication device using the same
    • 功率放大电路和通信设备使用相同
    • US20020093377A1
    • 2002-07-18
    • US09993698
    • 2001-11-27
    • Keiichi Sakuno
    • H03F001/34
    • H03F1/34H03F2200/151H03F2200/372
    • A power amplification circuit, and a communication device using the same, which are capable of suppressing gain decreases of a power amplifier due to increases in input signal power in a state near the saturation operation, capable of reducing its size, and low in distortion and high in efficiency. The power amplification circuit includes a power amplifier and a negative feedback circuit connected between a signal input terminal and a signal output terminal of the power amplifier. Impedance of the negative feedback circuit depends on a signal voltage occurring across the negative feedback circuit. By adjusting the characteristic that the negative feedback quantity of the negative feedback circuit to the power amplifier is variable depending on input signal power, gain fluctuations of the power amplifier due to increases or decreases of input signal power or output signal power around a specified output signal power are suppressed.
    • 功率放大电路及其使用方法的功能放大电路能够抑制在饱和运算附近的状态下由于输入信号功率的增加导致的功率放大器的增益减小,能够减小其尺寸,并且具有低的失真和 效率高 功率放大电路包括功率放大器和连接在功率放大器的信号输入端子和信号输出端子之间的负反馈电路。 负反馈电路的阻抗取决于负反馈电路两端产生的信号电压。 通过调整负值反馈电路对功率放大器的负反馈量根据输入信号功率而变化的特性,由于输入信号功率的增减或输出信号功率在指定输出信号周围的增益波动 权力被抑制
    • 10. 发明授权
    • Bipolar microwave monolithic amplifier with active feedback
    • 具有主动反馈的双极微波单片放大器
    • US5264806A
    • 1993-11-23
    • US891970
    • 1992-05-26
    • Kevin W. Kobayashi
    • Kevin W. Kobayashi
    • H03F1/48H03F1/34
    • H03F1/34H03F1/48H03F2200/151
    • A bipolar transistor is used as an active feedback inductor to emulate the frequency dependant impedance characteristics of a spiral inductor at microwave frequencies using active techniques. The active feedback is biased by several resistors. By substituting active feedback for a conventional spiral inductor, the chip layout can be reduced by as much as 50%. The bandwidth of the device can be controlled by choosing appropriate tuning resistor values to bias the active feedback inductor when fabricating the chip. By changing the value of these tuning resistors the inductance created can be directly controlled, which in turn affects the frequency response of the device.
    • 双极晶体管用作有源反馈电感器,以使用主动技术在微波频率下模拟螺旋电感器的频率相关阻抗特性。 有源反馈由几个电阻器偏置。 通过将常规螺旋电感器的主动反馈代替,芯片布局可以减少多达50%。 可以通过选择适当的调谐电阻值来控制器件的带宽,从而在制造芯片时偏置有源反馈电感器。 通过改变这些调谐电阻器的值,​​可以直接控制产生的电感,从而影响器件的频率响应。