公开(公告)号：US12113498B2

公开(公告)日：2024-10-08

申请号：US18181575

申请日：2023-03-10

申请人： SHENZHEN SHOKZ CO., LTD.

发明人： Xin Zhou ,  Lei Su ,  Yuxiang Zhang ,  Meiqi Li ,  Fengyun Liao ,  Xin Qi

IPC分类号： A61B5/305 ,  A61B5/00 ,  H03H11/04

CPC分类号： H03H11/04 ,  A61B5/7225 ,  A61B5/725 ,  A61B5/305 ,  H03H2011/0488

摘要： The embodiments of the present disclosure are for a signal processing circuit. The signal processing circuit includes an analog circuit. The analog circuit is used for processing an initial signal it receives. The initial signal includes a target signal and a noise signal. The analog circuit includes a first processing circuit and a second processing circuit. The first processing circuit is used to increase a ratio of the target signal to the noise signal, and output a first processed signal. The second processing circuit is used to amplify the first processed signal. A gain multiple of the second processing circuit to the first processed signal varies with a frequency of the first processed signal. The first processing circuit includes a common mode signal suppression circuit used to suppress a common mode signal in the initial signal, a low-pass filter circuit, and a high-pass filter circuit.

公开(公告)号：US20230179175A1

公开(公告)日：2023-06-08

申请号：US17543095

申请日：2021-12-06

申请人： International Business Machines Corporation

发明人： Matthew Beck

IPC分类号： H03H11/04 ,  H03K17/92

CPC分类号： H03H11/04 ,  H03K17/92 ,  H03H2011/0488

摘要： One or more systems, devices and/or methods of use provided herein relate to a device that can facilitate selective switching between band pass and band stop filter modes and/or can provide reflectionless or near reflectionless function. A device can comprise a filter circuit coupled between a pair of ports and comprising a direct current superconducting quantum interference device (DC SQUID), wherein the filter circuit is selectively activatable by varying the inductance of the DC SQUID. Applying flux bias to the DC SQUID can allow for the switching between the band pass and band stop filter modes.

公开(公告)号：US20190068410A1

公开(公告)日：2019-02-28

申请号：US15683873

申请日：2017-08-23

申请人： Silicon Laboratories Inc.

发明人： Mohammad Al-Shyoukh ,  Stefan Mastovich

IPC分类号： H04L25/02 ,  H03H11/04 ,  H03H7/06 ,  H03H7/01 ,  H03H11/38 ,  H04L25/08 ,  H04L27/06 ,  H04B1/10

CPC分类号： H04L25/0294 ,  H03H7/0161 ,  H03H7/06 ,  H03H7/065 ,  H03H11/04 ,  H03H11/38 ,  H03H2007/013 ,  H03H2011/0488 ,  H04B1/1036 ,  H04B2001/1063 ,  H04L25/0272 ,  H04L25/0292 ,  H04L25/08 ,  H04L25/085 ,  H04L27/06

摘要： A technique for attenuating common mode transient events uses a differential receiver circuit including a band-stop filter having a stopband fSB around a notch frequency fn of a received signal. The differential receiver circuit includes a first high-pass filter coupled in series with the band-stop filter. The notch frequency fn is less than a carrier frequency fc of a signal received by the differential receiver circuit. The band-stop filter may include a buffer circuit and a notch filter coupled in series with the buffer circuit. The notch filter may have a second stopband around the notch frequency fn. The differential receiver circuit may have a propagation delay that is independent of a pulse width of common mode transient energy attenuated by the differential receiver circuit.

公开(公告)号：US09214973B1

公开(公告)日：2015-12-15

申请号：US13941390

申请日：2013-07-12

申请人： Marvell International Ltd.

发明人： Swaroop Venkatesh ,  Vijay Ahirwar

IPC分类号： H04B1/10 ,  H04B1/00 ,  H03H15/00 ,  H04B1/04 ,  H04B1/525

CPC分类号： H04B1/1036 ,  H03H11/04 ,  H03H17/025 ,  H03H17/0294 ,  H03H17/04 ,  H03H2011/0488 ,  H03H2015/007 ,  H04B1/001 ,  H04B1/0475 ,  H04B1/1027 ,  H04B1/109 ,  H04B1/525 ,  H04B15/02 ,  H04B15/06 ,  H04B2001/1063 ,  H04B2215/064

摘要： The present disclosure includes systems and techniques relating to time-varying notch filter. In some implementations, an apparatus includes a time-variant notch filter and a controller. The time-variant notch filter includes a notch depth and a notch bandwidth. At least one of the notch depth or the notch bandwidth is based on a coefficient of the notch filter. The controller is configured to set at least one of the notch depth to a first depth or the notch bandwidth to a first bandwidth by setting a value of the coefficient to a first value during a ramp-up of the notch filter before a packet is received. The controller is also configured to set at least one of the notch depth to a second depth or the notch bandwidth to a second bandwidth by adjusting the value of the coefficient to a second value after the packet is received.

摘要翻译： 本公开包括与时变陷波滤波器相关的系统和技术。 在一些实施方式中，一种装置包括时变陷波滤波器和控制器。 时变陷波滤波器包括陷波深度和陷波带宽。 陷波深度或陷波带宽中的至少一个基于陷波滤波器的系数。 控制器被配置为通过在接收到分组之前在陷波滤波器的斜坡上升期间将系数的值设置为第一值，将陷波深度中的至少一个设置为第一深度或陷波带宽至第一带宽 。 控制器还被配置为通过在接收到分组之后将系数的值调整为第二值，将陷波深度中的至少一个设置为第二深度或陷波带宽到第二带宽。

公开(公告)号：US20150288392A1

公开(公告)日：2015-10-08

申请号：US14677938

申请日：2015-04-02

申请人： North Carolina State University

发明人： Brian A. Floyd ,  Charley Theodore Wilson, III

IPC分类号： H04B1/04 ,  H04B1/69 ,  H04W16/14

CPC分类号： H04W16/14 ,  H03H7/48 ,  H03H19/002 ,  H03H19/008 ,  H03H2007/013 ,  H03H2011/0488 ,  H03H2240/00

摘要： Methods, systems, and computer readable media for a tunable filter employing feedforward cancellation are disclosed. According to one aspect, the subject matter described herein includes a tunable transmissive filter that includes a splitter for splitting an input signal into a first signal and a second signal, a first modifier circuit for modifying a characteristic of the first signal to produce a modified first signal, a second modifier circuit for using feedforward cancellation to modify a characteristic of the second signal to produce a modified second signal, the second modifier circuit including an N-path filter, N being an integer greater than 0; and a combiner for combining the modified first signal and the modified second signal to produce a filtered output signal having a bandpass response.

摘要翻译： 公开了使用前馈抵消的可调谐滤波器的方法，系统和计算机可读介质。 根据一个方面，本文所述的主题包括可调透射滤波器，其包括用于将输入信号分成第一信号和第二信号的分路器，第一修改器电路，用于修改第一信号的特性以产生经修改的第一信号 信号，第二修正器电路，用于使用前馈消除来修改第二信号的特性以产生修改的第二信号，第二修改电路包括N路径滤波器，N是大于0的整数; 以及组合器，用于组合经修改的第一信号和修改的第二信号以产生具有带通响应的滤波输出信号。

公开(公告)号：US08823567B2

公开(公告)日：2014-09-02

申请号：US13534716

申请日：2012-06-27

申请人： Yosuke Mitani ,  Kazuo Matsukawa ,  Masao Takayama ,  Koji Obata ,  Shiro Dosho

发明人： Yosuke Mitani ,  Kazuo Matsukawa ,  Masao Takayama ,  Koji Obata ,  Shiro Dosho

IPC分类号： H03M3/00 ,  H03H11/04

CPC分类号： H03H11/04 ,  H03H2011/0488 ,  H03M3/404

摘要： Two T filters, one of which includes two resistive elements and one capacitive element and the other of which includes two capacitive elements and one resistive element, are inserted in a negative-feedback section of an operational amplifier, and a resistive element and a capacitive element are connected between each of intermediate nodes and a signal input terminal. A resistive element and a capacitive element which are connected to each other in parallel are connected between the signal input terminal and an inverting input terminal of the operational amplifier. With this configuration, overall admittances where elements connected to the corresponding intermediate nodes are in parallel connection are equal to each other.

摘要翻译： 两个T滤波器，其中一个包括两个电阻元件和一个电容元件，另一个包括两个电容元件和一个电阻元件，插入到运算放大器的负反馈部分中，电阻元件和电容元件 连接在每个中间节点和信号输入端子之间。 并联连接的电阻元件和电容元件连接在信号输入端子和运算放大器的反相输入端子之间。 利用这种配置，连接到对应的中间节点的元件并联连接的整体导纳彼此相等。

公开(公告)号：US07999608B1

公开(公告)日：2011-08-16

申请号：US12496419

申请日：2009-07-01

申请人： John B. Groe ,  Lucio Marc Facchni

发明人： John B. Groe ,  Lucio Marc Facchni

IPC分类号： H03K5/00

CPC分类号： H03F1/223 ,  H03F3/195 ,  H03F3/45188 ,  H03F2200/294 ,  H03F2200/391 ,  H03F2203/45386 ,  H03H7/03 ,  H03H7/12 ,  H03H7/1791 ,  H03H11/1213 ,  H03H11/245 ,  H03H2007/013 ,  H03H2011/0488

摘要： Apparatus and methods for providing integrated RF notch filter subsystems having enhanced Q values are described. An integrated notch filter includes an LC filter element and a Q-enhancement circuit coupled to the LC filter element, with the Q-enhancement circuit configured to offset resistive losses in the LC filter element to adjust the Q value of the filter system. A transceiver having multiple LNAs for various bands may be provided to a single notch filter system including a Q-enhancement circuit.

摘要翻译： 描述了用于提供具有增强的Q值的集成RF陷波滤波器子系统的装置和方法。 集成陷波滤波器包括耦合到LC滤波器元件的LC滤波器元件和Q增强电路，其中Q增强电路被配置为抵消LC滤波器元件中的电阻损耗以调整滤波器系统的Q值。 可以向包括Q增强电路的单陷波滤波器系统提供具有用于各种频带的多个LNA的收发器。

公开(公告)号：US07292095B2

公开(公告)日：2007-11-06

申请号：US11340223

申请日：2006-01-26

申请人： Rodney T. Burt ,  Joy Y. Zhang

发明人： Rodney T. Burt ,  Joy Y. Zhang

IPC分类号： H03F1/02

CPC分类号： H03F3/45968 ,  H03F1/26 ,  H03F3/005 ,  H03F3/387 ,  H03F2200/261 ,  H03F2200/459 ,  H03F2203/45212 ,  H03H19/004 ,  H03H2011/0488

摘要： A chopper-stabilized amplifier receiving an input signal includes a first operational transconductance amplifier having an input chopper and an output chopper for chopping an output signal produced by the first operational transconductance amplifier. A switched capacitor notch filter filters the chopped output signal by operating synchronously with the chopping frequency of output chopper to filter ripple voltages that otherwise would be produced by the output chopper. In one embodiment, a second operational transconductance amplifier amplifies the notch filter output. The input signal is fed forward, summed with the output of the second operational transconductance amplifier, and applied to the input of a fourth operational transconductance amplifier. Ripple noise and offset are substantially reduced.

摘要翻译： 接收输入信号的斩波稳定放大器包括具有输入斩波器的第一操作跨导放大器和用于斩波由第一操作跨导放大器产生的输出信号的输出斩波器。 开关电容器陷波滤波器通过与输出斩波器的斩波频率同步工作来对斩波输出信号进行滤波，以滤除由输出斩波器产生的纹波电压。 在一个实施例中，第二运算跨导放大器放大陷波滤波器输出。 输入信号被前馈，与第二个运算跨导放大器的输出相加，并施加到第四个运算跨导放大器的输入端。 纹波噪声和偏移量大大降低。

公开(公告)号：US06552604B2

公开(公告)日：2003-04-22

申请号：US10052062

申请日：2002-01-17

申请人： Donald R. Cargille

发明人： Donald R. Cargille

IPC分类号： H03B100

CPC分类号： H03H11/126 ,  H03H11/12 ,  H03H2007/013 ,  H03H2011/0488 ,  H03H2210/012 ,  H03H2210/021

摘要： A notch filter circuit is provided including a first stage circuit and a second stage circuit. The first stage circuit sums a filter input signal with a filter output signal to form a summation signal. The second stage circuit includes a first tee network and a second tee network. The first tee network low-pass filters the filter input signal to form a first tee output signal. The second tee network high-pass filters the summation signal to form a second tee output signal. A first multiplying digital-to-analog converter is electrically coupled to the first tee network and the second tee network. The first converter modifies the gain of the second tee network in response to a gain signal to form a corrected second tee network signal, thereby adjusting a notch filter frequency.

公开(公告)号：US20160056765A1

公开(公告)日：2016-02-25

申请号：US14549756

申请日：2014-11-21

申请人： Kevin Kim ,  Igor Ivanovich Blednov ,  Olivier Lembeye ,  Pascal Peyrot

发明人： Kevin Kim ,  Igor Ivanovich Blednov ,  Olivier Lembeye ,  Pascal Peyrot

IPC分类号： H03F1/02 ,  H03F3/21 ,  H03F3/19

CPC分类号： H03F3/211 ,  H01L23/66 ,  H01L2223/6611 ,  H01L2223/6644 ,  H01L2224/49175 ,  H03F1/32 ,  H03F3/195 ,  H03F2200/165 ,  H03F2200/451 ,  H03F2203/21106 ,  H03H7/09 ,  H03H2011/0488 ,  H03H2240/00

摘要： In a system comprising a plurality of gain elements configured in parallel to one another, a harmonically tuned filter provides an isolation circuit to prevent odd-mode differential oscillations. A harmonically tuned filter comprises resistors, inductors, and capacitors (RLC) to selectively allow one or more specific harmonics to pass through the isolation circuit to suppress the odd-mode oscillation. Direct current (DC) and other non-harmonically-related frequencies do not pass through the isolation circuit. Since the resistor is used to dissipate specifically the energy of the harmonic frequencies causing the odd-mode oscillation, the current density through the resistor is much lower than the current density of a typical odd-mode resistor without a harmonically tuned filter.

摘要翻译： 在包括彼此并联配置的多个增益元件的系统中，谐波调谐的滤波器提供隔离电路以防止奇数差分振荡。 谐波调谐滤波器包括电阻器，电感器和电容器（RLC），以选择性地允许一个或多个特定谐波通过隔离电路以抑制奇数振荡。 直流（DC）和其他非谐波相关频率不通过隔离电路。 由于电阻器用于特别耗散引起奇模振荡的谐波频率的能量，所以通过电阻器的电流密度比没有谐波调谐滤波器的典型奇模电阻器的电流密度要低得多。