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    Radio receiver/transmitter filters
    21.
    发明公开
    Radio receiver/transmitter filters 失效
    发送者/Empfängerfilter。

    公开(公告)号：EP0185416A2

    公开(公告)日：1986-06-25

    申请号：EP85201956.1

    申请日：1985-11-26

    申请人： PHILIPS ELECTRONICS UK LIMITED ,  Philips Electronics N.V.

    发明人： Marshall, Christopher Brian

    IPC分类号： H03H11/04 ,  H03H19/00 ,  H03D1/24 ,  H03C1/60

    CPC分类号： H03H19/002 ,  H03C1/60 ,  H03D1/24 ,  H03H11/04

    摘要： A radio receiver or transmitter including a tunable filter constituted by an N-path filter (14) having a local oscillator (52). the centre frequency of which filter is displaced from the oscillator (52) frequency through the use of feedback (26).
    In the case of a radio receiver the feedback provides image rejection. Preferably an i.f. signal is taken from the low frequency section of the N-path filter.
    In the case of a radio transmitter, an i.f. signal is applied to a low frequency path within the N-path filter. The use of feedback avoids the generation of an image frequency transmission.

    摘要翻译： 一种无线电接收机或发射机，包括由具有本地振荡器（52）的N路径滤波器（14）构成的可调谐滤波器，该滤波器的中心频率通过使用反馈（26）从振荡器（52）的频率位移， 。 ...在无线电接收机的情况下，反馈提供镜像抑制。 优选i.f. 信号取自N路径滤波器的低频部分。 在无线电发射机的情况下，i.f. 信号被施加到N路径滤波器内的低频路径。 反馈的使用避免了图像频率传输的产生。

    CIRCUITS AND METHODS FOR TRANSCEIVER SELF-INTERFERENCE CANCELLERS
    24.
    发明公开
    CIRCUITS AND METHODS FOR TRANSCEIVER SELF-INTERFERENCE CANCELLERS 审中-公开
    用于收发器自干扰消除器的电路和方法

    公开(公告)号：EP3202043A1

    公开(公告)日：2017-08-09

    申请号：EP15847787.7

    申请日：2015-10-01

    申请人： Zhou, Jin ,  Krishnaswamy, Harish

    发明人： Zhou, Jin ,  Krishnaswamy, Harish

    IPC分类号： H03L7/085

    CPC分类号： H03H19/002 ,  H03H11/0422 ,  H03H11/0444 ,  H03H11/362 ,  H03H2210/012 ,  H03H2210/015 ,  H03H2210/017 ,  H03H2210/021 ,  H03H2210/025 ,  H03H2210/028

    摘要： Self-interference cancellers are provided. The self-interference cancellers can include multiple second-order, N-path Gm-C filters. Each filter can be configured to cancel self- interference on a channel of a desired bandwidth. Each filter can be independently controlled using a variable transmitter resistance, a variable receiver resistance, a variable baseband capacitance, a variable transconductance, and a variable time shift between local oscillators that control switches in the filter. By controlling these variables, magnitude, phase, slope of magnitude, and slope of phase of the cancellers frequency responses can be controlled for self- interference cancellation. A calibration process is also provided for configuring the canceller.

    摘要翻译： 提供自干扰消除器。 自干扰消除器可以包括多个二阶N路Gm-C滤波器。 每个滤波器可以配置为消除所需带宽的信道上的自干扰。 每个滤波器可以使用可变发射器电阻，可变接收器电阻，可变基带电容，可变跨导以及控制滤波器中开关的本地振荡器之间的可变时间偏移来独立控制。 通过控制这些变量，可以控制消除器频率响应的幅度，相位，幅度斜率和相位斜率以用于自干扰消除。 还提供校准过程来配置消除器。

    TUNABLE RF CHANNEL SELECT FILTER
    25.
    发明公开
    TUNABLE RF CHANNEL SELECT FILTER 审中-公开
    可调谐RF信道选择滤波器

    公开(公告)号：EP3080910A1

    公开(公告)日：2016-10-19

    申请号：EP14869578.6

    申请日：2014-11-26

    申请人： Nokia Technologies OY

    发明人： AGGARWAL, Sudhir ,  HASAN, Md. Naimul

    IPC分类号： H03H19/00 ,  H04B1/10 ,  H04B1/04 ,  H03H11/04

    CPC分类号： H03H7/0161 ,  H03H7/06 ,  H03H7/17 ,  H03H7/42 ,  H03H11/0422 ,  H03H19/002 ,  H03H19/004 ,  H03H2007/013 ,  H03H2210/012

    摘要： Methods and apparatus, including computer program products, are provided for RF filtering. The apparatus comprises: a first bandpass filter to receive a differential signal, wherein the first bandpass filter comprises a resistive-capacitive configuration of N-path filters tunable to a first center frequency; a first notch filter to receive a first output of the first bandpass filter, wherein the first notch filter comprises a capacitive-resistive configuration of N-path filters tunable to a first notch center frequency; a second bandpass filter to receive a second output of the first notch filter, wherein the second bandpass filter comprises a resistive-capacitive configuration of N-path filters tunable to the first center frequency; a second notch filter to receive a third output of the second bandpass filter, wherein the second notch filter comprises a capacitive-resistive configuration of N-path filters tunable to a second notch center frequency; and a third bandpass filter to receive a fourth output of the second notch filter and to provide a filtered output of the apparatus, wherein the third bandpass filter comprises a resistive-capacitive configuration of N-path filters tunable to the first center frequency.

    HARMONIC REJECTION TRANSLATIONAL FILTER
    26.
    发明公开
    HARMONIC REJECTION TRANSLATIONAL FILTER 审中-公开
    谐波抑制变换滤波器

    公开(公告)号：EP3039789A1

    公开(公告)日：2016-07-06

    申请号：EP15735613.0

    申请日：2015-03-13

    申请人： MediaTek Inc.

    发明人： LU, Ying-Tsang ,  HUNG, Chih-Ming ,  LEE, Meng-Chang

    IPC分类号： H04B1/10 ,  H03D7/00

    CPC分类号： H03D7/1483 ,  H03D7/1441 ,  H03D7/1458 ,  H03D7/1466 ,  H03D2200/0086 ,  H03H11/0405 ,  H03H11/0466 ,  H03H19/002

    摘要： A harmonic translational filter includes a first path, a second path and a signal combiner. The first path has a first translational filter that is driven by a plurality of first oscillation signals, and is arranged to generate a first output signal according to an input signal. The second path has a second translation filter that is driven by a plurality of second oscillation signals that are different from the first oscillation signals in phase. The second path is coupled to the first path and arranged to generate a second output signal according to the input signal. The signal combiner is coupled to the first path and the second path, and arranged to combine the first output signal and the second output signal to generate a filtered signal.

    摘要翻译： 谐波抑制平移滤波器包括：第一路径，第二路径和信号组合器。 第一路径具有由多个第一振荡信号驱动的第一平移滤波器，并且被布置为根据输入信号产生第一输出信号。 第二路径具有第二转换滤波器，该第二转换滤波器由多个第二振荡信号驱动，该第二振荡信号的相位与第一振荡信号不同。 第二路径耦合到第一路径并且被布置为根据输入信号生成第二输出信号。 信号组合器耦合到第一路径和第二路径，并且被布置为组合第一输出信号和第二输出信号以生成滤波后的信号。

    FREQUENCY TRANSLATION FILTER APPARATUS AND METHOD
    27.
    发明公开
    FREQUENCY TRANSLATION FILTER APPARATUS AND METHOD 有权
    佛罗伦萨大自然保护区（VERFAHRENDAFÜR）的FREQUENZUMSETZUNGS-FILTERVORRICHTUNG

    公开(公告)号：EP2673879A1

    公开(公告)日：2013-12-18

    申请号：EP12705086.2

    申请日：2012-02-08

    申请人： Telefonaktiebolaget L M Ericsson (PUBL)

    发明人： MATTISSON, Sven ,  SUNDSTRÖM, Leif

    IPC分类号： H03D7/16

    CPC分类号： H03D7/16 ,  H03D7/166 ,  H03H19/002

    摘要： A frequency translation filter 500 is configured to receive a radio frequency (RF) signal 501 comprising first and second non-contiguous carriers or non-contiguous frequency ranges. The frequency translation filter comprises a mixer 503 configured to mix the RF signal 501 received on a first input with a local oscillator (LO) signal 505 received on a second input. A filter 507 has band-pass characteristics which, when frequency translated using the mixer 503, contain first and second pass-bands corresponding to the first and second non-contiguous carriers or non-contiguous frequency ranges. The first and second pass-bands are centered about the local oscillator frequency.

    摘要翻译： 频率转换滤波器500被配置为接收包括第一和第二非连续载波或非连续频率范围的射频（RF）信号501。 频率转换滤波器包括：混频器503，被配置为混合在第一输入端接收的RF信号501与在第二输入端接收的本地振荡器（LO）信号505。 滤波器507具有带通特性，当使用混频器503进行频率转换时，其包含对应于第一和第二非连续载波或非连续频率范围的第一和第二通带。 第一和第二通带以本地振荡器频率为中心。

    Frequency translation filter apparatus and method
    28.
    发明公开
    Frequency translation filter apparatus and method 审中-公开
    不经意的人

    公开(公告)号：EP2487787A1

    公开(公告)日：2012-08-15

    申请号：EP11154194.2

    申请日：2011-02-11

    申请人： Telefonaktiebolaget L M Ericsson (PUBL)

    发明人： Sundström, Lars ,  Mattisson, Sven

    IPC分类号： H03D7/16

    CPC分类号： H03D7/16 ,  H03D7/166 ,  H03H19/002 ,  H03H19/008

    摘要： A frequency translation filter 500 is configured to receive a radio frequency (RF) signal 501 comprising first and second non-contiguous carriers or non-contiguous frequency ranges. The frequency translation filter comprises a mixer 503 configured to mix the RF signal 501 received on a first input with a local oscillator (LO) signal 505 received on a second input. A filter 507 has band-pass characteristics which, when frequency translated using the mixer 503, contain first and second pass-bands corresponding to the first and second non-contiguous carriers or non-contiguous frequency ranges. The first and second pass-bands are centered about the local oscillator frequency.

    摘要翻译： 频率转换滤波器500被配置为接收包括第一和第二非连续载波或非连续频率范围的射频（RF）信号501。 频率转换滤波器包括：混频器503，被配置为混合在第一输入端接收的RF信号501与在第二输入端接收的本地振荡器（LO）信号505。 滤波器507具有带通特性，当使用混频器503进行频率转换时，其包含对应于第一和第二非连续载波或非连续频率范围的第一和第二通带。 第一和第二通带以本地振荡器频率为中心。

    ELECTRICAL TEST INSTRUMENT
    29.
    发明公开
    ELECTRICAL TEST INSTRUMENT 失效
    电测试器

    公开(公告)号：EP0706663A1

    公开(公告)日：1996-04-17

    申请号：EP94918977.0

    申请日：1994-06-30

    申请人： Avo International Limited

    发明人： GURR, David, James

    IPC分类号： G01R31 ,  H03H19

    CPC分类号： H03H19/002 ,  G01R31/42

    摘要： In an electrical test instrument for determining a loop impedance in a circuit breaker protected AC circuit, a test current of less than the circuit breaker trigger current is supplied to the circuit and the test voltage which develops due to the test current is isolated and detected. For testing a 240 volts 50 Hertz mains supply circuit, the test instrument includes a two-path cross synchronised filter (4) which rejects the 240 volts mains signal to isolate the test voltage signal to enable an accurate determination of the loop impedance to be made.