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公开(公告)号：US20070202830A1
公开(公告)日：2007-08-30
申请号：US11679119
申请日：2007-02-26
申请人： Khurram Muhammad , Chih-Ming Hung
发明人： Khurram Muhammad , Chih-Ming Hung
IPC分类号： H04B1/10
CPC分类号： H04B1/123 , H04B15/005
摘要： The present invention provides a spurious tone suppressor for use with a power supply system. In one embodiment, the spurious tone suppressor includes an error signal generator configured to provide a spur error signal proportional to a spur signal associated with the power supply system. Additionally, the spurious tone suppressor also includes an adaptive spur cancellation engine coupled to the error signal generator and configured to adaptively process the spur error signal and generate a corresponding anti-spur signal that is injected into the power supply system to suppress the spur signal.
摘要翻译： 本发明提供一种与电源系统一起使用的杂音抑制器。 在一个实施例中，伪噪声抑制器包括误差信号发生器，其被配置为提供与与电源系统相关联的杂散信号成比例的杂散误差信号。 另外，伪噪声抑制器还包括耦合到误差信号发生器的自适应杂散消除引擎，并且被配置为自适应地处理杂散误差信号并产生注入到电源系统中以抑制杂散信号的相应的反辅助信号。
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42.发明申请Offset balancer, method of balancing an offset and a wireless receiver employing the balancer and the method 有权偏移平衡器，平衡偏移的方法和采用平衡器的无线接收器及其方法公开(公告)号：US20070105522A1
公开(公告)日：2007-05-10
申请号：US11270122
申请日：2005-11-09
申请人： Khurram Muhammad , Dirk Leipold
发明人： Khurram Muhammad , Dirk Leipold
IPC分类号： H04B1/26
CPC分类号： H03D3/008
摘要： The present invention provides an offset balancer for use with a differential mixer employing a wireless reception and an offset quantifier configured to indicate an existing DC offset of the mixer corresponding to an existing second-order intercept point applicable to the wireless reception. In one embodiment, the offset balancer includes an offset adjuster coupled to the offset quantifier and configured to provide an offset adjustment to the existing DC offset based on increasing the existing second-order intercept point.
摘要翻译： 本发明提供一种与使用无线接收的差分混频器一起使用的偏移平衡器和配置为指示对应于可应用于无线接收的现有二阶截取点的混频器的现有DC偏移的偏移量化器。 在一个实施例中，偏移平衡器包括偏移调整器，该偏移调整器耦合到偏移量化器并且被配置为基于增加现有的二阶截取点来提供对现有DC偏移的偏移调整。
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43.发明授权Digitally controlled analog RF filtering in subsampling communication receiver architecture 有权二次采样通信接收机架构中的数字控制模拟RF滤波公开(公告)号：US07079826B2
公开(公告)日：2006-07-18
申请号：US10099831
申请日：2002-03-15
IPC分类号： H04B1/06
CPC分类号： H04B1/0025 , H03H15/00 , H03H19/004 , H04B1/0003 , H04B1/28 , H04L27/24
摘要： A first periodic voltage waveform (20) is downconverted into a second periodic voltage waveform (35, 36). A plurality of temporally distinct samples (SA1, SA2, . . . ) respectively indicative of areas under corresponding half-cycles of the first voltage waveform are obtained. The samples are combined to produce the second voltage waveform, and are also manipulated to implement a filtering operation such that the second voltage waveform represents a downconverted, filtered version of the first voltage waveform.
摘要翻译： 第一周期性电压波形（20）被下变频成第二周期性电压波形（35,36）。 获得分别表示第一电压波形的相应半周期下的面积的多个时间上不同的样本（SA 1，SA 2 ...）。 将样本组合以产生第二电压波形，并且还被操纵以实现滤波操作，使得第二电压波形表示第一电压波形的下变换的滤波版本。
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公开(公告)号：US20060135107A1
公开(公告)日：2006-06-22
申请号：US11339386
申请日：2006-01-25
IPC分类号： H04B1/10
CPC分类号： H04B1/28 , H04B1/1036
摘要： System and method for elimination of close-in interferers through feedback. A preferred embodiment comprises an interferer predictor (for example, interferer predictor 840) coupled to a digital output of a direct RF radio receiver (for example, radio receiver 800). The interferer predictor predicts the presence of interferers and feeds the information back to a sampling unit (for example, sampling unit 805) through a feedback circuit (for example, feedback unit 845) through the use of charge sharing. The interferers are then eliminated in the sampling unit. Additionally, the number and placement of zeroes in a filter in the sampling unit is increased and changed through the implementation of arbitrary-coefficient finite impulse response filters.
摘要翻译： 通过反馈消除接近干扰的系统和方法。 优选实施例包括耦合到直接RF无线电接收机（例如，无线电接收机800）的数字输出的干扰源预测器（例如，干扰源预测器840）。 干扰源预测器预测干扰源的存在，并且通过使用电荷共享通过反馈电路（例如，反馈单元845）将信息反馈给采样单元（例如，采样单元805）。 然后在采样单元中消除干扰源。 另外，通过执行任意系数有限脉冲响应滤波器来增加和改变采样单元滤波器中的零数和位置。
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45.发明申请公开(公告)号：US20050237233A1
公开(公告)日：2005-10-27
申请号：US10832531
申请日：2004-04-27
申请人： Khurram Muhammad
发明人： Khurram Muhammad
摘要： The present invention is directed to a programmable loop filter, a method of programming the same and a sigma delta analog-to-digital converter (ADC) incorporating the programmable loop filter or the method. In one embodiment, the programmable loop filter includes: (1) a configurable filter structure containing selectably interconnectable alternative filter elements and (2) a configuration controller coupled to the configurable filter structure and operable to interconnect at least a selected one of the filter elements to determine a transfer characteristic of the configurable filter structure and set an operating condition of the sigma delta ADC.
摘要翻译： 本发明涉及一种可编程环路滤波器，其编程方法以及结合有可编程环路滤波器或该方法的Σ-Δ模数转换器（ADC）。 在一个实施例中，可编程环路滤波器包括：（1）包含可选择地互连的替代滤波器元件的可配置滤波器结构，以及（2）耦合到可配置滤波器结构并且可操作以将至少一个所选滤波器元件互连到 确定可配置滤波器结构的传输特性并设置Σ-ΔADC的工作状态。
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公开(公告)号：US20050233725A1
公开(公告)日：2005-10-20
申请号：US10828386
申请日：2004-04-20
CPC分类号： H03D7/18 , H03H19/004 , H03H2007/0192
摘要： Disclosed are methods, circuits and systems for image reject filtering in a multi-tap direct sampling mixer (MTDSM) of an IF or RF system. Disclosed is the use of rotating capacitors among the in-phase and quadrature branches of a signal processing system. The exchange of information among the branches of the I and Q channels is used in the implementation of a complex filter. Embodiments using cascaded multiple stages of the complex filter to provide higher order complex filters are also disclosed.
摘要翻译： 公开了用于IF或RF系统的多抽头直接采样混频器（MTDSM）中的图像抑制滤波的方法，电路和系统。 公开了在信号处理系统的同相和正交分支中使用旋转电容器。 在I和Q通道的分支之间的信息交换被用于实现复杂的过滤器。 还公开了使用复合滤波器的级联多级以提供更高阶复数滤波器的实施例。
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47.发明申请Active removal of aliasing frequencies in a decimating structure by changing a decimation ratio in time and space 有权通过在时间和空间上改变抽取比例，在抽取结构中主动去除混叠频率公开(公告)号：US20050025269A1
公开(公告)日：2005-02-03
申请号：US10924297
申请日：2004-08-23
CPC分类号： H03D7/125 , H04B1/1036
摘要： When a sample stream is decimated, frequency components from outside of a desired frequency band are aliased into the desired band, causing interference and loss of information. Different decimating ratios result in different frequencies aliasing into the desired frequency band. A current-mode sampling mixer 800 with capacitor banks 811 and 812 that are controlled by a digital control unit 820 with a capability to integrate and decimate an RF current at different decimating ratios is able to measure the frequency spectrum with different decimating ratios. The measured frequency spectrum is then analyzed to detect the presence of interferers aliased into the desired frequency band. The interferers can then be eliminated or avoided.
摘要翻译： 当采样流被抽取时，来自期望频带外部的频率分量被混叠成所需频带，导致信息的干扰和丢失。 不同的抽取率导致不同的频率混叠成所需的频带。 具有电容器组811和812的电流模式采样混频器800能够以不同的抽取率对能够集成和抽取RF电流的数字控制单元820进行控制，能够以不同的抽取率来测量频谱。 然后分析测量的频谱以检测混叠到期望频带中的干扰源的存在。 然后可以消除或避免干扰源。
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公开(公告)号：US06734741B2
公开(公告)日：2004-05-11
申请号：US10006607
申请日：2001-11-30
IPC分类号： H03L700
CPC分类号： H03C3/0975 , H03C3/0941 , H03C3/095 , H03C3/0958 , H03C3/0966 , H03K19/0016 , H03L7/085 , H03L7/087 , H03L7/091 , H03L7/093 , H03L7/099 , H03L7/16 , H03L2207/50 , H04L7/0029
摘要： A transmitter (10) based on a frequency synthesizer includes an LC tank (12) of a digitally controlled oscillator (DCO) with various arrays of capacitors. The LC tank 12 is divided into two major groups that reflect two general operational modes: acquisition and tracking. The first group (process/voltage/temperature and acquisition) approximately sets the desired center frequency of oscillation initially, while the second group (integer and fractional tracking) precisely controls the oscillating frequency during the actual operation. For highly accurate outputs, dynamic element matching (DEM) is used in the integer tracking controller to reduce non-linearities caused by non-uniform capacitor values. Also, a preferred range of the integer tracking capacitor array may be used for modulation after the selected channel has been acquired. A digital sigma-delta modulator circuit (50) drives a capacitor array (14d) in response to the fractional bits of the error word. On mode switches, the accumulated error is recalculated to a phase restart value to prevent perturbations.
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49.发明授权Low noise amplifier with embedded filter and related wireless communication unit 有权具有嵌入式滤波器和相关无线通信单元的低噪声放大器公开(公告)号：US09413315B2
公开(公告)日：2016-08-09
申请号：US11469298
申请日：2006-08-31
申请人： Sher Jiun Fang , Khurram Muhammad
发明人： Sher Jiun Fang , Khurram Muhammad
CPC分类号： H03F3/45188 , H03F1/223 , H03F1/56 , H03F3/193
摘要： In one embodiment, a WCDMA FDD system includes an embedded filter that provides a complex load to transistors in a low noise amplifier. The complex load can be constructed using passive and/or active devices and creates an arbitrary transfer function that supports selective Q-enhancement of poles or zeros. One particular implementation of the embedded filter is in the form of an LC tank circuit. The LC tank circuit is operably coupled to the output of the low noise amplifier and creates a transfer function whose poles and zeros can be selected to reject transmitter leakage in the WCDMA system, while maintain a desirable gain at the frequency of operation.
摘要翻译： 在一个实施例中，WCDMA FDD系统包括为低噪声放大器中的晶体管提供复杂负载的嵌入式滤波器。 可以使用无源和/或有源器件构建复杂负载，并创建支持极点或零点的选择性Q增强的任意传递函数。 嵌入式滤波器的一个具体实现方式是LC槽电路的形式。 LC槽电路可操作地耦合到低噪声放大器的输出，并产生传递函数，其极点和零点可被选择以拒绝WCDMA系统中的发射器泄漏，同时在操作频率下保持期望的增益。
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公开(公告)号：US08682395B2
公开(公告)日：2014-03-25
申请号：US13359889
申请日：2012-01-27
申请人： Khurram Muhammad
发明人： Khurram Muhammad
IPC分类号： H04M1/00
CPC分类号： G06F3/046 , G01S7/023 , G01S13/345 , G01S13/876 , G01S13/88 , G01S2013/466 , G06F3/03545
摘要： A communications device includes a housing and a wireless transceiver and processor carried by the housing and operative with each other. An input screen is carried by the housing and comprises a plurality of spaced transceivers positioned at the input screen and connected to the processor and each configured to transmit a millimeter wave RF signal and receive reflected signals from an object positioned close to the input screen. The processor is configured to determine the location of the object relative to the input screen based on the reflected signals received at each transceiver.
摘要翻译： 通信设备包括壳体和由壳体承载并且彼此操作的无线收发器和处理器。 输入屏幕由壳体承载并且包括位于输入屏幕处并连接到处理器的多个间隔开的收发器，并且每个收发器被配置为传送毫米波RF信号并且接收来自靠近输入屏幕的物体的反射信号。 处理器被配置为基于在每个收发器处接收的反射信号来确定对象相对于输入屏幕的位置。
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