公开(公告)号：US09991874B1

公开(公告)日：2018-06-05

申请号：US15341829

申请日：2016-11-02

Applicant: NORTHROP GRUMMAN SYSTEMS CORPORATION

Inventor： Timothy R. LaRocca ,  Denpol Kultran

IPC: H03H11/04 ,  H03H11/26 ,  H03H11/32

CPC classification number: H03H15/02 ,  H03H2015/007

Abstract: A tunable analog noise-cancelling transversal reconfigurable filter for filtering an RF signal. The filter includes a noise-cancelling balun responsive to the RF signal and providing gain and noise suppression, and a time delay network responsive to the signal from the balun. The time delay network includes a single continuous three-dimensional air coaxial line where a separate tap is provided between sections of the line. The filter also includes a multiplication and summing network having a plurality of multiplication stages, where each stage is fed by a voltage signal from at least one of the taps, and each stage includes a multiplication amplifier that amplifies the voltage signal. A tuning element provides a multiplication coefficient to the amplified signal. Each amplified signal in each stage is added on an output line, where the multiplication and summing network operates under Millman's Theorem.

公开(公告)号：US09940415B2

公开(公告)日：2018-04-10

申请号：US15019445

申请日：2016-02-09

Applicant: ESS Technology, Inc.

Inventor： A. Martin Mallinson ,  Hu Jing Yao ,  Dustin Forman

IPC: G06F17/50 ,  H03H15/02 ,  H03K5/15 ,  H03K5/1536

CPC classification number: G06F17/5009 ,  H03H15/02 ,  H03K5/15 ,  H03K5/1536

Abstract: A method and system for designing and implementing a finite impulse response (FIR) filter to create a plurality of output signals, each output signal having the same frequency but at a different phase shift from the other output(s), is described. Values are determined for the resistors, or other elements having impedance values, in a FIR filter having a plurality of outputs, such that each output has the same frequency response but a different phase than the other output(s). This is accomplished by the inclusion of a phase factor in the time domain calculation of the resistor values that does not change the response in the frequency domain. The phase shift is constant and independent of the frequency of the output signal.

公开(公告)号：US09698759B2

公开(公告)日：2017-07-04

申请号：US14269647

申请日：2014-05-05

Applicant: ANALOG DEVICES, INC.

Inventor： Eric Nestler ,  Jeffrey Venuti ,  Vladimir Zlatkovic ,  Kartik Nanda

IPC: H01B1/10 ,  H03H15/02 ,  G01R27/26 ,  G06G7/19 ,  G06F17/14 ,  G01D5/24 ,  G01R31/02

CPC classification number: H03H15/02 ,  G01D5/24 ,  G01R27/2605 ,  G01R31/028 ,  G06F17/14 ,  G06G7/19

Abstract: An approach to time domain filtering uses a passive charge sharing approach to implement an infinite impulse response filter. Delayed samples of an input signal are stored as charges on capacitors of a first array of capacitors, and delayed samples of the output signal are stored as charges on capacitors of a second array of capacitors. Outputs are determined by passively coupling capacitors of the first and second arrays to one another, and determining the output according to a total charge on the coupled capacitors. In some examples, a gain is applied to the total charge prior to storing the output on the second array of capacitors. In some examples, a charge scaling circuit is applied to the charges stored on the arrays prior to coupling capacitors to form the output.

公开(公告)号：US20160006416A1

公开(公告)日：2016-01-07

申请号：US14790448

申请日：2015-07-02

Applicant: ESS Technology, Inc.

Inventor： A. Martin Mallinson

IPC: H03H17/02

CPC classification number: H03H15/02

Abstract: A system and method is disclosed for placing some of the elements of a FIR filter into a high impedance state in certain situations. When it is detected that the signal to an impedance element is the same as the previous value, then the driver of that impedance element is “turned off” or goes into a high impedance state, so that no current flows through that impedance element, and it no longer contributes to the filter output. Alternatively, if the impedance elements are the same between two adjacent taps of the delay line, the driver of one of those impedance elements may be turned off or go into a high impedance state. The technique may be particularly useful in differential output filters. Turning off a driver effectively removes the attached impedance element from the filter and reduces current flow and power consumption, thus extending battery life in mobile devices.

Abstract translation: 公开了一种用于在某些情况下将FIR滤波器的一些元件置于高阻抗状态的系统和方法。 当检测到阻抗元件的信号与前一个值相同时，该阻抗元件的驱动器被“关断”或进入高阻抗状态，使得没有电流流过该阻抗元件，并且 它不再有助于滤波器输出。 或者，如果阻抗元件在延迟线的两个相邻抽头之间相同，那么这些阻抗元件中的一个的驱动器可能被关断或进入高阻抗状态。 该技术在差分输出滤波器中可​​能特别有用。 关闭驱动器可有效地从滤波器中去除附加的阻抗元件，并减少电流和功耗，从而延长移动设备的电池寿命。

公开(公告)号：US20150256360A1

公开(公告)日：2015-09-10

申请号：US14589872

申请日：2015-01-05

Applicant: Hiroshi Takatori ,  Albert Vareljian ,  Oleksiy Zabroda

Inventor： Hiroshi Takatori ,  Albert Vareljian ,  Oleksiy Zabroda

IPC: H04L25/03 ,  H04B3/32 ,  H03H21/00 ,  H04L1/00

CPC classification number: H04L25/03038 ,  H03H11/26 ,  H03H11/46 ,  H03H15/02 ,  H03H21/0001 ,  H04B3/32 ,  H04L1/0047 ,  H04L25/03057 ,  H04L25/03133 ,  H04L25/03343 ,  H04L2025/03477 ,  H04L2025/0349 ,  H04L2025/03503 ,  H04L2025/03598

Abstract: According to an embodiment of the disclosure, a communication transmitter and receiver include an adaptive filter and a decision feedback equalizer as well as cross-talk cancellers. The adaptive filter is configured to receive an input signal and includes a continuous analog delay circuit with a plurality of Padé-based delay elements.

Abstract translation: 根据本公开的实施例，通信发射机和接收机包括自适应滤波器和判决反馈均衡器以及串扰消除器。 自适应滤波器被配置为接收输入信号并且包括具有多个基于Padé的延迟元件的连续模拟延迟电路。

公开(公告)号：US08188753B2

公开(公告)日：2012-05-29

申请号：US12545590

申请日：2009-08-21

Applicant: Eric Nestler ,  Vladimir Zlatkovic

Inventor： Eric Nestler ,  Vladimir Zlatkovic

IPC: G01R27/26

CPC classification number: H03H15/02 ,  G01D5/24 ,  G01R27/2605 ,  G01R31/028 ,  G06F17/14 ,  G06G7/19

Abstract: Some general aspects of the invention relate to a circuit and to a method for analog computation, for example, using switched capacitor integrated circuits. In some examples, a circuit includes a first group of capacitors and a second group of capacitors that may store charges during circuit operation. The first and/or the second group of capacitors may include multiple disjoint subsets of capacitors. An input circuit is provided for receiving a set of input signals and for inducing a charge on each of some or all capacitors in the first group of capacitors according to a corresponding input signal. Switches, for example, transistors controlled by a sequence of clock signals, are used to couple different sets of capacitors. Different configurations of the switches are used to form different sets of the capacitors among which charge can redistribute.

Abstract translation: 本发明的一些一般方面涉及电路和模拟计算的方法，例如使用开关电容器集成电路。 在一些示例中，电路包括第一组电容器和可在电路操作期间存储电荷的第二组电容器。 第一和/或第二组电容器可以包括电容器的多个不相交的子集。 提供输入电路，用于根据相应的输入信号接收一组输入信号并用于在第一组电容器中的一些或全部电容器的每一个上感应电荷。 开关，例如，由一系列时钟信号控制的晶体管，用于耦合不同组的电容器。 开关的不同配置用于形成不同的电容器组，其中电荷可重新分布。

公开(公告)号：US08135340B2

公开(公告)日：2012-03-13

申请号：US12397096

申请日：2009-03-03

Applicant: Ahmadreza Rofougaran ,  Maryam Rofougaran

Inventor： Ahmadreza Rofougaran ,  Maryam Rofougaran

IPC: H04B7/24

CPC classification number: H01P9/00 ,  H01L23/66 ,  H01L2223/6677 ,  H01L2224/16235 ,  H01L2224/32225 ,  H01L2224/73204 ,  H01L2924/0002 ,  H01L2924/15321 ,  H01L2924/19105 ,  H03H15/02 ,  H01L2924/00

Abstract: Methods and systems for a configurable finite impulse response (FIR) filter using a transmission line as a delay line are disclosed and may include selectively coupling one or more taps of a multi-tap transmission line to configure delays for one or more finite impulse response (FIR) filters to enable transmission and/or reception of signals. The delays may be configured based on a location of the one or more selectively coupled taps on the multi-tap transmission line. The FIR filters, which may include one or more stages, may be impedance matched to the selectively coupled taps. The multi-tap transmission line may be integrated on the chip, or a package to which the chip is coupled. The multi-tap transmission line may include a microstrip structure or a coplanar waveguide structure, and may include ferromagnetic material. The distortion of signals in the chip may be compensated utilizing the FIR filters.

Abstract translation: 公开了使用传输线作为延迟线的可配置有限脉冲响应（FIR）滤波器的方法和系统，并且可以包括选择性地耦合多抽头传输线的一个或多个抽头以配置一个或多个有限脉冲响应的延迟（ FIR）滤波器以实现信号的发送和/或接收。 可以基于多抽头传输线上的一个或多个选择性耦合抽头的位置来配置延迟。 可以包括一个或多个级的FIR滤波器可以与选择性耦合的抽头阻抗匹配。 多抽头传输线可以集成在芯片上，或者与芯片耦合到的封装上。 多抽头传输线可以包括微带结构或共面波导结构，并且可以包括铁磁材料。 可以利用FIR滤波器来补偿芯片中信号的失真。

公开(公告)号：US07941475B2

公开(公告)日：2011-05-10

申请号：US11501382

申请日：2006-08-09

Applicant: Rahim Bagheri ,  Ahmad Mirzaei

Inventor： Rahim Bagheri ,  Ahmad Mirzaei

IPC: G06G7/02

CPC classification number: H03H15/02

Abstract: Embodiments of the present invention include programmable filter circuits and methods. In one embodiment, the present invention includes a programmable filter for filtering an input signal comprising a storage element for storing a plurality of digital values representing a discrete time window function, and a plurality of filter channels, each channel comprising a multiplying digital-to-analog converter having a plurality of digital inputs coupled to the storage element and an analog input for receiving said input signal to be filtered, at least one capacitor having at least one terminal coupled to an output of the multiplying digital-to-analog converter, and a sampling device coupled between the at least one terminal of the at least one capacitor and an output of the filter. In another embodiment, the present invention includes a software defined radio.

Abstract translation: 本发明的实施例包括可编程滤波器电路和方法。 在一个实施例中，本发明包括一个可编程滤波器，用于对输入信号进行滤波，该输入信号包括用于存储表示离散时间窗函数的多个数字值的存储元件和多个滤波器通道，每个通道包括乘法数字 - 模拟转换器，其具有耦合到存储元件的多个数字输入端和用于接收要滤波的所述输入信号的模拟输入端，至少一个电容器，其至少一个端子耦合到乘法数模转换器的输出端，以及 耦合在所述至少一个电容器的所述至少一个端子和所述滤波器的输出端之间的采样装置。 在另一个实施例中，本发明包括软件定义的无线电装置。

公开(公告)号：US07904048B2

公开(公告)日：2011-03-08

申请号：US11935318

申请日：2007-11-05

Applicant: Meng-Chang Lee ,  Khurram Muhammad

Inventor： Meng-Chang Lee ,  Khurram Muhammad

IPC: H04B1/10 ,  H03B1/00

CPC classification number: H04B1/1027 ,  H03H15/02 ,  H03H19/004 ,  H03H19/008

Abstract: A multi-tap direct sub-sampling mixing system for wireless receivers is provided with a dynamically configurable passive switched capacitor filter. A front end amplifier is connected to receive a signal. The passive switched capacitor filter is connected to receive the amplified signal and has an output for providing a filtered signal. The switched capacitor filter has at least two sections that are each operable as a pole, wherein a first section of the at least two sections has sets of at least two stacked capacitors interconnected with a set of switches operable to amplify in input voltage provided to an input of the first section in response to operation of the set of switches; and a back end section connected to the output of the switched capacitor filter to receive the filtered signal.

Abstract translation: 无线接收器的多抽头直接子采样混合系统提供有动态可配置的无源开关电容滤波器。 连接前端放大器以接收信号。 无源开关电容滤波器被连接以接收放大的信号并具有用于提供滤波信号的输出。 开关电容器滤波器具有至少两个部分，每个部分可用作极点，其中至少两个部分的第一部分具有由一组开关互连的至少两个堆叠电容器组，其可操作以在提供给 响应于该组开关的操作而输入第一部分; 以及连接到开关电容滤波器的输出端以接收经滤波的信号的后端部分。

公开(公告)号：US20090002208A1

公开(公告)日：2009-01-01

申请号：US12009736

申请日：2008-01-22

Applicant: Naotoshi Nishioka

Inventor： Naotoshi Nishioka

IPC: H03M7/00

CPC classification number: H03H15/02

Abstract: In a sampling frequency conversion apparatus, an input sample register stores a predetermined number of input samples as an original sequence of input samples for an interpolative operation. A coefficient generating part prepares a first sequence of interpolative coefficients corresponding to an oversampled sequence of input samples which are obtained by inserting nominal input samples of zero values to the input samples stored in the input sample register, and generates a second sequence of interpolative coefficients which are extracted from the first sequence of the interpolative coefficients and which correspond to the original sequence of the input samples. A convolutional operation part convolutes the second sequence of the interpolative coefficients with the original sequence of the input samples so as to output an interpolated sample.

Abstract translation: 在采样频率转换装置中，输入采样寄存器将预定数量的输入采样存储为用于内插操作的输入采样的原始序列。 系数生成部分准备与通过将零值的标称输入样本插入到存储在输入样本寄存器中的输入样本而获得的输入样本的过采样序列相对应的内插系数的第一序列，并生成第二序列的内插系数， 从内插系数的第一序列中提取，并且对应于输入样本的原始序列。 卷积运算部分将内插系数的第二序列与输入样本的原始序列进行卷积，以便输出插值样本。