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16 条记录 (耗时 0.027 秒)

    Filter circuit, and radio terminal having filter circuit
    3.
    发明专利
    Filter circuit, and radio terminal having filter circuit 审中-公开
    滤波电路和无线电终端有过滤电路

    公开(公告)号：JP2013046133A

    公开(公告)日：2013-03-04

    申请号：JP2011181341

    申请日：2011-08-23

    申请人： Sony Corp ,  ソニー株式会社

    发明人： IIDA YUKIO

    IPC分类号： H04B1/30 ,  H03H7/38 ,  H04B1/18 ,  H04B1/26

    CPC分类号： H03H19/004 ,  H03H19/008

    摘要： PROBLEM TO BE SOLVED: To provide a filter circuit capable of increasing a frequency range of good input impedance matching, having a steeper attenuation characteristic, and capable of increasing an attenuation amount.SOLUTION: The filter circuit includes a passive mixer circuit, and a passive switched capacitor circuit including a flying capacitor, connected to a stage subsequent to the passive mixer circuit. The passive mixer circuit generates a baseband signal by multiplying an input signal supplied with predetermined signal source impedance by a local oscillation signal, and outputs the baseband signal to the passive switched capacitor circuit. The passive switched capacitor circuit outputs the baseband signal supplied by the passive mixer circuit after applying predetermined filtering. Capacitance of the flying capacitor in the passive switched capacitor circuit serves for matching the input impedance of the passive mixer circuit to the signal source impedance.

    摘要翻译： 要解决的问题：提供一种能够增加良好的输入阻抗匹配的频率范围的滤波器电路，具有更陡的衰减特性，并且能够增加衰减量。 解决方案：滤波器电路包括无源混频器电路和包括飞越电容器的无源开关电容器电路，其连接到无源混频器电路之后的级。 无源混频器电路通过将由预定信号源阻抗提供的输入信号乘以本地振荡信号来产生基带信号，并将基带信号输出到无源开关电容器电路。 无源开关电容电路在施加预定滤波后输出由无源混频器电路提供的基带信号。 无源开关电容电路中的浮动电容器的电容用于将无源混频器电路的输入阻抗与信号源阻抗进行匹配。 版权所有（C）2013，JPO＆INPIT

    Systems, methods, and apparatus for frequency conversion
    4.
    发明专利
    Systems, methods, and apparatus for frequency conversion 审中-公开
    用于频率转换的系统，方法和装置

    公开(公告)号：JP2012134996A

    公开(公告)日：2012-07-12

    申请号：JP2012015122

    申请日：2012-01-27

    申请人： Qualcomm Inc ,  クゥアルコム・インコーポレイテッドQualcomm Incorporated

    发明人： ZHUO WEI ,  ARISTOTELE HADJICHRISTOS ,  SAHOTA GURKANWAL KAMAL ,  SOLTI PENG

    IPC分类号： H03D7/14 ,  H03D7/00 ,  H04B1/18

    CPC分类号： H03D7/166 ,  H03H19/008 ,  H03H2007/0192

    摘要： PROBLEM TO BE SOLVED: To perform frequency conversion such that a frequency conversion gain is maximized and/or the level of noise in a converted signal is minimized.SOLUTION: A method includes using a quadrature set of local oscillator signals having duty cycles of substantially less than 50 percent to perform a mixing operation on a radio-frequency current signal. Other embodiments include using a quadrature set of local oscillator signals having duty cycles of less than 25 percent.

    摘要翻译： 要解决的问题：进行频率转换，使得频率转换增益最大化和/或转换信号中的噪声电平最小化。 解决方案：一种方法包括使用占空比基本上小于50％的本地振荡器信号的正交组来对射频电流信号进行混频操作。 其他实施例包括使用占空比小于25％的本地振荡器信号的正交集合。 版权所有（C）2012，JPO＆INPIT

    The mixer circuit and method
    10.
    发明专利
    The mixer circuit and method 审中-公开

    公开(公告)号：JP2009519643A

    公开(公告)日：2009-05-14

    申请号：JP2008544919

    申请日：2006-11-16

    申请人： テレフオンアクチーボラゲット エル エム エリクソン(パブル)

    发明人： ニーダール，アンドレアス ,  ニルソン，マグニゥス ,  マッティソン，スヴェン ,  マットソン，トーマス

    IPC分类号： H04B1/26 ,  H03D7/14

    CPC分类号： H03D7/1441 ,  H03D7/1458 ,  H03D7/165 ,  H03D2200/0023 ,  H03D2200/0084 ,  H03H19/008

    摘要： A receiver circuit (10) is disclosed comprising: a low-noise amplifier circuit (12); a mixer circuit (14); and a capacitive coupling circuit (16) comprising matched capacitive coupling circuits. In one aspect, the mixer circuit has a transconductance g m of 50 to 200, the capacitive coupling having a capacitance C of 0.5 to 10 pF to couple an output radio frequency, RF, signal of the low-noise amplifier circuit into inputs of the mixer circuit, wherein ÉC > g m . In another aspect, the capacitive coupling circuit (16) comprises matched capacitive coupling circuits having a capacitor sized for a voltage drop of about 25 mV at room temperature such that sensitivity of the mixer circuit to imbalances in transconductance gains g m is reduced. In a further aspect, it is disclosed a receiver circuit (10) comprising a single-ended low-noise amplifier circuit (12); a quadrature mixer circuit (14) having a first and a second input; and a capacitive coupling circuit (16) that splits the single-ended output signal from the low-noise amplifier circuit into a first signal applied to the first quadrature mixer input, and a second signal applied to the second quadrature mixer input.