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1. 发明申请

US20190013794A1 POLYPHASE FILTER AND FILTER CIRCUIT 审中-公开
公开(公告)号：US20190013794A1
公开(公告)日：2019-01-10
申请号：US16067701
申请日：2016-02-17
申请人： MITSUBISHI ELECTRIC CORPORATION
发明人： Atsushi KATO , Eiji TANIGUCHI , Takaya MARUYAMA , Takanobu FUJIWARA , Koji TSUTSUMI
IPC分类号： H03H11/12 , H03H11/20 , H03H11/22
CPC分类号： H03H11/12 , H03H7/21 , H03H11/20 , H03H11/22 , H03H2007/0192 , H03H2210/021 , H03H2210/025
摘要： Provided is a polyphase filter, which is capable of achieving amplitude matching and phase matching while achieving a low insertion loss with a single-stage configuration. A first variable resistor and a second variable resistor have resistance values that are equal to each other, and the resistance values are set so as to correct an amplitude error between orthogonal signals of outputs of a first output terminal to a fourth output terminal. A first variable capacitor, a second variable capacitor, a third variable capacitor, and a fourth variable capacitor have capacitance values that are equal to one another, and the capacitance values are set so as to correct a phase error between the orthogonal signals of the outputs of the first output terminal to the fourth output terminal.

2. 发明申请

US20170093448A1 OUTPUT DRIVER ARCHITECTURE WITH LOW SPUR NOISE 有权
公开(公告)号：US20170093448A1
公开(公告)日：2017-03-30
申请号：US14868473
申请日：2015-09-29
申请人： Silicon Laboratories Inc.
发明人： Michael R. May
IPC分类号： H04B1/10 , H03H11/04 , H03H11/12
CPC分类号： H04B1/1036 , H03H11/0405 , H03H11/12
摘要： In one embodiment, an integrated circuit includes: a first input pad to receive a radio frequency (RF) signal; a radio receiver to process the RF signal and output a digitally processed signal; an analog filter to receive a digital signal via an input signal path and output a drive signal via an output signal path; and a first output pad coupled to the output signal path to output a filtered digital signal based on the drive signal.

3. 发明授权

US09608569B2 Linearizing scheme for baseband filter with active feedback 有权
公开(公告)号：US09608569B2
公开(公告)日：2017-03-28
申请号：US14806334
申请日：2015-07-22
申请人： QUALCOMM Incorporated
发明人： Bhushan Shanti Asuri , Alok Prakash Joshi , Gireesh Rajendran
IPC分类号： H03F3/04 , H03F1/02 , H03F3/193 , H03F1/32 , H03C3/08 , H04B1/30
CPC分类号： H03F1/0205 , H03C3/08 , H03F1/3205 , H03F3/193 , H03F2200/129 , H03F2200/165 , H03F2200/451 , H03F2200/456 , H03H11/04 , H03H11/12 , H04B1/30
摘要： A method and apparatus for linearizing a baseband filter are provided. The apparatus is configured to, via a first conducting module, receive a first current signal. The apparatus is further configured to, via a converting module, receive a second current signal, generate a voltage signal based on the second current signal, and apply the voltage signal to the first conducting module. An amount of the second current signal received by the converting module is based on an amount of the first current signal flowing through the first conducting module. The apparatus is also configured to, via a second conducting module, control an output current signal based on the voltage signal. The output current signal is controlled to be a linear replica of the first current signal for in-band frequencies.

4. 发明申请

US20160173063A1 ANALOG BASEBAND FILTERING APPARATUS OF MULTIMODE MULTIBAND WIRELESS TRANSCEIVER AND CONTROL METHOD THEREOF 有权
标题翻译：多模式无线收发器的模拟基带滤波器及其控制方法
公开(公告)号：US20160173063A1
公开(公告)日：2016-06-16
申请号：US14908067
申请日：2014-07-24
申请人： SAMSUNG ELECTRONICS CO., LTD.
发明人： Byungki HAN , Suseob AHN , Jongwoo LEE
IPC分类号： H03H11/12 , H03H11/04
CPC分类号： H03H11/12 , H03H7/24 , H03H11/0405 , H03H11/0455 , H03H11/1252 , H03H11/1291 , H03H2011/0494 , H03H2250/00 , H04L25/03
摘要： A filtering apparatus and method of a multimode multiband transceiver is provided for filtering a signal carrying an analog baseband signal. A filtering apparatus of a multimode multiband radio transceiver of the present invention includes a filtering unit which filters Radio Frequency (RF) signals on one of at least one frequency bands, a switching unit which switches the signals among at least one filter block included in the filtering unit according to a selected communication mode, and a controller which selects the communication mode and controls the switching unit. The analog signal filtering apparatus and method of the present invention is advantageous in terms of providing a variable gain amplifier, filter circuit, and algorithm capable of fulfilling the gains and bandwidths required by the baseband receiver for all mobile communication standards complied by 2G, 3G, and 4G systems.
摘要翻译：提供了一种多模多频收发器的滤波装置和方法，用于对携带模拟基带信号的信号进行滤波。本发明的多模多频带无线电收发器的滤波装置包括：滤波单元，其对至少一个频带中的一个频带上的射频（RF）信号进行滤波;切换单元，其在包括在所述至少一个频带中的至少一个滤波器块过滤单元，以及选择通信模式并控制切换单元的控制器。本发明的模拟信号滤波装置和方法在提供一种可变增益放大器，滤波器电路和算法方面是有利的，该可变增益放大器，滤波器电路和算法能够满足基带接收机对2G，3G所遵循的所有移动通信标准所需的增益和带宽，和4G系统。

5. 发明授权

US08913652B2 Method, system and apparatus for wideband signal processing 有权
标题翻译：用于宽带信号处理的方法，系统和装置
公开(公告)号：US08913652B2
公开(公告)日：2014-12-16
申请号：US12921987
申请日：2009-03-10
申请人： Divi Gupta , Dev V. Gupta
发明人： Divi Gupta , Dev V. Gupta
IPC分类号： H03H7/30 , H03H7/40 , H03H11/12
CPC分类号： H03H11/1291 , H03H11/12 , H03H11/1252 , H03H2240/00
摘要： Embodiments include methods, systems, and apparatuses capable of dynamically and adaptively operating on wideband signals. Examples include state variable filters whose center frequencies can be tuned using variable gain blocks coupled to outputs of filter integrators. First- and second-order state variable filters may operate on signals in parallel and their outputs combined to produce a filtered output. Filters may be tuned to pass or reject signals depending on the application; sample applications include, but are not limited to: agile filtering; spectrum analysis; interference detection and rejection; equalization; direct intermediate-frequency transmission; and single-sideband modulation and demodulation.
摘要翻译：实施例包括能够在宽带信号上动态和自适应地操作的方法，系统和装置。示例包括状态变量滤波器，其中心频率可以使用耦合到滤波器积分器的输出的可变增益块进行调谐。一阶和二阶状态变量滤波器可以对并联的信号进行操作，并且它们的输出组合以产生滤波输出。可以根据应用调整滤波器以通过或拒绝信号; 示例应用程序包括但不限于：敏捷过滤; 频谱分析; 干扰检测和拒绝; 均衡直接中频传输; 和单边带调制解调。

6. 发明申请

US20120161990A1 INTEGRATOR AND OVERSAMPLING A/D CONVERTER HAVING THE SAME 有权
标题翻译：集成器和OVERSAMPING A / D转换器
公开(公告)号：US20120161990A1
公开(公告)日：2012-06-28
申请号：US13410964
申请日：2012-03-02
申请人： Shiro Dosho
发明人： Shiro Dosho
IPC分类号： H03M1/12 , G06G7/18
CPC分类号： G06G7/186 , H03H11/12 , H03M3/39 , H03M3/454
摘要： A high order integrator is configured using an operational amplifier, a first filter connected between an input terminal of the integrator and an inverted input terminal of the operational amplifier, and a second filter connected between the inverted input terminal and output terminal of the operational amplifier. The first filter includes n serially-connected first resistance elements, n-1 first capacitance elements each connected between each interconnecting node of the first resistance elements and the ground, and n-1 second resistance elements each connected between each interconnecting node of the first resistance elements and the ground. The second filter includes n serially-connected second capacitance elements, n-1 third resistance elements each connected between each interconnecting node of the second capacitance elements and the ground, and n-1 third capacitance elements each connected between each interconnecting node of the second capacitance elements and the ground.
摘要翻译：高阶积分器使用运算放大器配置，第一滤波器连接在积分器的输入端和运算放大器的反相输入端之间，第二滤波器连接在运算放大器的反相输入端和输出端之间。第一滤波器包括n个串联连接的第一电阻元件，每个连接在第一电阻元件的每个互连节点和地之间的n-1个第一电容元件，以及分别连接在第一电阻的每个互连节点之间的n-1个第二电阻元件元素和地面。第二滤波器包括n个串联连接的第二电容元件，n-1个第三电阻元件，每个连接在第二电容元件的每个互连节点和地之间; n-1个第三电容元件，每个连接在第二电容的每个互连节点之间元素和地面。

7. 发明申请

US20070024480A1 Digital/analog converter and method for digital/analog conversion of a signal 失效
标题翻译：数字/模拟转换器和数字/模拟转换信号的方法
公开(公告)号：US20070024480A1
公开(公告)日：2007-02-01
申请号：US11489037
申请日：2006-07-19
申请人： Christoph Schwoerer
发明人： Christoph Schwoerer
IPC分类号： H03M1/66
CPC分类号： H03H11/12 , H03H11/1286 , H03M3/344 , H03M3/502 , H03M7/3022
摘要： A digital/analog converter contains an input for supplying a first digital word having a first word length. A noise shaper is coupled to the input and is designed to convert the first digital word into a second digital word having a second word length and to output this digital word to an output. The output of the noise shaper has a filter device coupled to it which is designed to reject signal components in the second digital word. Finally, a conversion device is connected to the output of the filter device. The conversion device is designed to convert the second digital word into an analog signal and to provide the analog signal for an output. By filtering the signal which is output by the noise shaper, the noise components contained in the noise-shaped second digital word are rejected.
摘要翻译：数字/模拟转换器包含用于提供具有第一字长的第一数字字的输入。噪声整形器耦合到输入端并被设计成将第一数字字转换为具有第二字长的第二数字字，并将该数字字输出到输出。噪声整形器的输出具有耦合到其的滤波器装置，其被设计为抑制第二数字字中的信号分量。最后，转换装置连接到过滤装置的输出端。该转换装置被设计成将第二数字字转换为模拟信号并提供用于输出的模拟信号。通过对由噪声整形器输出的信号进行滤波，噪声形状的第二数字字中包含的噪声分量被拒绝。

8. 发明申请

US20060141957A1 Controlling Q-factor of filters 有权
标题翻译：控制滤波器的Q因子
公开(公告)号：US20060141957A1
公开(公告)日：2006-06-29
申请号：US11021481
申请日：2004-12-23
申请人： Georg Fischer , Gerhard Kaminski , Wolfgang Eckl
发明人： Georg Fischer , Gerhard Kaminski , Wolfgang Eckl
IPC分类号： H04B1/04 , H04B1/16
CPC分类号： H04B1/04 , H03F3/24 , H03H11/12 , H04B1/0475 , H04B2001/0408
摘要： The present invention provides a method and an apparatus for controlling a Q-factor for a filter. The method comprises stabilizing an active feedback to provide a variable feedback in a filter, varying the active feedback based on an input signal to the filter, and producing a desired Q-factor for the filter at a first frequency band, in response to the variable feedback. The method further comprises reconfiguring a center frequency and a bandwidth of the filter based on a channel bandwidth of the input signal to the filter to adjust the Q-factor for the filter in response to a second frequency band different than the first frequency band. By reconfiguring a center frequency and a bandwidth of a filter, the Q-factor for the filter, such as a flexible or reconfigurable filter, may be controlled across a multiplicity of frequency band signals. Using software, for example, a common signal path may be provided for the multiplicity of frequency band signals within a frequency agile radio of a base station by tuning the radio based on a variable feedback through realization of a negative parallel resistance. Thus, tuneability of the Q-factor may provide frequency agile radios that include flexible or reconfigurable filters in a base station to serve different frequency bands without changing hardware. In this way, significant savings associated with frequency agility may be obtained.
摘要翻译：本发明提供一种用于控制滤波器的Q因子的方法和装置。该方法包括稳定主动反馈以在滤波器中提供可变反馈，基于到滤波器的输入信号来改变有源反馈，并响应于变量产生用于滤波器的第一频带的期望Q因子反馈。该方法还包括基于输入信号的滤波器的信道带宽来重新配置滤波器的中心频率和带宽，以响应于与第一频带不同的第二频带来调整滤波器的Q因子。通过重新配置滤波器的中心频率和带宽，可以跨越多个频带信号来控制滤波器的Q因子，例如灵活或可重构滤波器。例如，使用软件，可以通过基于通过实现负并联电阻的可变反馈调谐无线电来为基站的频率捷变无线电中的多个频带信号提供公共信号路径。因此，Q因子的可调性可以提供频率敏捷无线电，其包括基站中的灵活或可重新配置的滤波器，以服务不同的频带而不改变硬件。以这种方式，可以获得与频率捷变相关的显着节省。

9. 发明授权

US5606280A Band-pass filter system 失效
标题翻译：带通滤波器系统
公开(公告)号：US5606280A
公开(公告)日：1997-02-25
申请号：US540394
申请日：1995-10-06
申请人： Ki S. Sohn
发明人： Ki S. Sohn
IPC分类号： H03H11/04 , H03H11/00 , H03H11/12 , H03J7/04 , H03J7/06 , H03L7/08 , H03K5/00 , H03H7/12
CPC分类号： H03J7/065 , H03H11/12 , H03J7/04 , H03L7/08
摘要： A band-pass filter system comprises a band-pass filter, and a frequency band controller for controlling a frequency band of the band-pass filter by generating a corresponding up pulse voltage and a down pulse voltage according to a pre-controlled center frequency obtained from an output frequency of the band-pass filter to produce a control frequency for obtaining a desired center frequency of the band-pass filter.
摘要翻译：带通滤波器系统包括带通滤波器和频带控制器，用于根据获得的预先控制的中心频率产生对应的上升脉冲电压和下降脉冲电压来控制带通滤波器的频带从带通滤波器的输出频率产生用于获得带通滤波器的期望中心频率的控制频率。

10. 发明授权

US4661789A Microwave recursive filter 失效
标题翻译：微波递归滤波器
公开(公告)号：US4661789A
公开(公告)日：1987-04-28
申请号：US755757
申请日：1985-07-17
申请人： Christen Rauscher
发明人： Christen Rauscher
IPC分类号： H03H11/12 , H01P1/20
CPC分类号： H03H11/12
摘要： A broadband microwave recursive filter that provides sharp transitions in the frequency domain between adjacent stop and passbands comprising a signal input node; a signal output node; a filter circuit connected between the signal input node and the signal output node for providing a signal flow therebetween which has a predetermined frequency bandwidth characteristic; a microwave transistor circuit, with the microwave transistor circuit being band-limited to provide gain in only a restricted window of frequencies within the predetermined frequency bandwidth and connected for providing amplification to signals flowing in the filter circuit between the signal input node and the signal output node while suppressing out-of-window signals resulting from design approximations. The filter circuit includes a plurality of distributed feedback loop circuits, with each of the feedback loop circuits including the microwave transistor circuit therein, and wherein each of the feedback loop circuits has a different electrical length in relation to the other of the plurality of feedback loop circuits. Finally, the present filter design includes a passive filter connected in common to all of the plurality of distributed feedback loop circuits in the filter circuit for circuit for providing filter zeros on both sides of the restricted window of frequencies. In a preferred embodiment, the microwave transistor circuit includes an FET which is impedance-matched to obtain an approximately flat gain response across the window. It is preferred that the plurality of feedback loops all have amplitude weighting factors of the same sign.
摘要翻译：一种宽带微波递归滤波器，其在包括信号输入节点的相邻停止和通带之间的频域中提供急剧的转变; 信号输出节点; 连接在信号输入节点和信号输出节点之间的滤波器电路，用于在其间提供具有预定频带特性的信号流; 微波晶体管电路，其中微波晶体管电路被限制频带，以在预定频率带宽内仅在频率受限的窗口内提供增益，并被连接用于向在信号输入节点和信号输出端之间的滤波器电路中流动的信号提供放大节点，同时抑制由设计近似导致的窗外信号。滤波器电路包括多个分布式反馈回路电路，其中每个反馈回路电路包括其中的微波晶体管电路，并且其中每个反馈回路电路相对于多个反馈回路中的另一个具有不同的电长度电路。最后，本滤波器设计包括与滤波电路中的所有多个分布式反馈回路电路共同连接的无源滤波器，用于在受限频率窗口的两侧提供滤波器零点。在一个优选实施例中，微波晶体管电路包括一个阻抗匹配的FET，以在整个窗口上获得近似平坦的增益响应。优选地，多个反馈回路都具有相同符号的幅度加权因子。

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