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1.发明授权Multiplexed configurable sigma delta modulators for noise shaping in a 25-percent duty cycle digital transmitter 有权用于25％占空比数字发射机中的噪声整形的多路复用可配置Σ-Δ调制器公开(公告)号：US08890634B2
公开(公告)日：2014-11-18
申请号：US13661412
申请日：2012-10-26
Applicant: MStar Semiconductor, Inc.
Inventor： Dennis Mahoney , Bernard Ginetti , Zhongxuan Zhang , Khurram Muhammad , Chih-Ming Hung , Ming-Yu Hsieh
CPC classification number: H03M3/50 , H03M7/3042 , H04L5/06 , H04L27/20
Abstract: A modulator generates a baseband digital signal from an information-bearing digital signal. The baseband signal has time-varying phase and amplitude defined by a sequence of complex data words, each having an in-phase (I) component and a quadrature (Q) component. A noise-shaping modulator generates a noise-shaped digital signal from the baseband digital signal such that quantization noise in the noise-shaping modulator is attenuated by a spectral null of its noise transfer function. The spectral null is selected by a noise-shaping parameter corresponding to a selected one of a plurality of output frequencies. A signal converter generates an analog signal conveying the information of the information-bearing digital signal on an analog carrier signal having the selected output frequency.
Abstract translation: 调制器从信息承载数字信号产生基带数字信号。 基带信号由具有同相（I）分量和正交（Q）分量的复数数据字序列定义的时变相位和幅度。 噪声整形调制器从基带数字信号产生噪声形数字信号，使得噪声整形调制器中的量化噪声被其噪声传递函数的频谱零点衰减。 通过对应于多个输出频率中选择的一个的噪声整形参数来选择频谱零点。 信号转换器在具有所选输出频率的模拟载波信号上产生传送信息承载数字信号的信息的模拟信号。
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2.发明申请Multiplexed Configurable Sigma Delta Modulators for Noise Shaping in a 25-Percent Duty Cycle Digital Transmitter 有权用于在25％占空比数字发射机中进行噪声整形的多路复用可配置Sigma Delta调制器公开(公告)号：US20140118081A1
公开(公告)日：2014-05-01
申请号：US13661412
申请日：2012-10-26
Applicant: MSTAR SEMICONDUCTOR, INC.
Inventor： Dennis Mahoney , Bernard Ginetti , Zhongxuan Zhang , Khurram Muhammad , Chih-Ming Hung , Ming-Yu Hsieh
IPC: H03C5/00
CPC classification number: H03M3/50 , H03M7/3042 , H04L5/06 , H04L27/20
Abstract: A modulator generates a baseband digital signal from an information-bearing digital signal. The baseband signal has time-varying phase and amplitude defined by a sequence of complex data words, each having an in-phase (I) component and a quadrature (Q) component. A noise-shaping modulator generates a noise-shaped digital signal from the baseband digital signal such that quantization noise in the noise-shaping modulator is attenuated by a spectral null of its noise transfer function. The spectral null is selected by a noise-shaping parameter corresponding to a selected one of a plurality of output frequencies. A signal converter generates an analog signal conveying the information of the information-bearing digital signal on an analog carrier signal having the selected output frequency.
Abstract translation: 调制器从信息承载数字信号产生基带数字信号。 基带信号由具有同相（I）分量和正交（Q）分量的复数数据字序列定义的时变相位和幅度。 噪声整形调制器从基带数字信号产生噪声形数字信号，使得噪声整形调制器中的量化噪声被其噪声传递函数的频谱零点衰减。 通过对应于多个输出频率中选择的一个的噪声整形参数来选择频谱零点。 信号转换器在具有所选输出频率的模拟载波信号上产生传送信息承载数字信号的信息的模拟信号。
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公开(公告)号：US20150071390A1
公开(公告)日：2015-03-12
申请号：US14021069
申请日：2013-09-09
Applicant: MStar Semiconductor, Inc.
Inventor： Khurram Muhammad
IPC: H04B1/10
Abstract: To compensate for second-order intermodulation (IM2), it is determined whether a blocking signal is present at a receiver. A biasing differential is applied across downconverting mixers in the receiver that minimizes cross-correlation of quadrature signal components of a signal produced by the receiver in the presence of the blocking signal.
Abstract translation: 为了补偿二阶互调（IM2），确定接收器是否存在阻塞信号。 在接收机中的下变频混频器之间施加偏置差分，其最小化在存在阻塞信号时由接收机产生的信号的正交信号分量的互相关。
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4.发明申请Convergence Estimation for Iterative Predistortion Factor Determination for Predistortion in Power Amplifiers 有权用于迭代预失真因子确定功率放大器预失真的收敛估计公开(公告)号：US20150024699A1
公开(公告)日：2015-01-22
申请号：US13946387
申请日：2013-07-19
Applicant: MStar Semiconductor, Inc.
Inventor： Khurram Muhammad
CPC classification number: H03F1/3241 , H03F1/3247 , H03F1/34 , H03F3/195 , H03F3/21 , H03F3/24 , H03F3/245 , H03F3/45071 , H03F3/45475 , H03F2200/336 , H03F2201/3233 , H04B1/0475 , H04B2001/0425 , H04B2001/0433
Abstract: To estimate complex factors for use in predistortion of a power amplifier, a complex factor is selected a set of complex factors a computation interval. A solution value is estimated for the selected complex factor during the computation interval by an iterative computation that constrains the estimated solution value towards a final solution value over an arbitrary number of iterations that is not bounded by the duration of the computation interval. A cumulative error in the estimated solution value is computed at each iteration over consecutive computation intervals. From the cumulative error, it is determined whether a convergence criterion is met and, if so, the estimating is terminated. The termination occurs independently of the solution value estimated for any one of the complex factors in the set.
Abstract translation: 为了估计在功率放大器预失真中使用的复杂因子，复杂因素是选择一组复杂因子的计算间隔。 在计算间隔期间通过迭代计算对所选择的复数因子估计解值，该迭代计算将估计的解值限制在不受计算间隔的持续时间限制的任意数量的迭代上的最终解值。 在连续计算间隔的每次迭代中计算估计解值的累积误差。 从累积误差确定是否满足收敛标准，如果是，则终止估计。 终止发生与集合中任何一个复杂因子估计的解值无关。
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公开(公告)号：US20140361913A1
公开(公告)日：2014-12-11
申请号：US14283301
申请日：2014-05-21
Applicant: MStar Semiconductor, Inc.
Inventor： Ming-Yu Hsieh , Shih-Chieh Yen , Khurram Muhammad
CPC classification number: H03M1/66 , H03H17/0294 , H03H17/0621 , H03M3/30 , H03M3/496 , H03M3/498
Abstract: A communication system including a configurable sample rate converter and a controller is provided. The configurable sample rate converter, configured to convert a digital signal with a first sample rate to a converted signal with a second sample rate, being operable in one of a first configuration and a second configuration. The controller, configured to dynamically control the sample rate converter to operate in one of the first configuration and the second configuration according to at least one condition.
Abstract translation: 提供了包括可配置采样率转换器和控制器的通信系统。 可配置采样率转换器，被配置为将具有第一采样率的数字信号转换为具有第二采样率的转换信号，其可在第一配置和第二配置中的一个中操作。 控制器被配置为根据至少一个条件动态地控制采样率转换器以工作在第一配置和第二配置之一中。
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Patent Agency Ranking
公开(公告)号：US09258081B2
公开(公告)日：2016-02-09
申请号：US13760184
申请日：2013-02-06
Applicant: MStar Semiconductor, Inc.
Inventor： Dennis Mahoney , Khurram Muhammad
CPC classification number: H04L1/0033 , H03F1/3241 , H03F2200/336 , H03F2201/3233 , H04L27/367
Abstract: A predistortion function is evaluated with in-phase (I) and quadrature (Q) data words as arguments, while additive I and Q data words are generated in accordance with a comparison of the I and Q data words with a full scale value that generates maximum current in a digital power amplifier. The additive I and Q data words are added to the computed I and Q data words to produce predistorted I and Q data words. The predistorted I and Q data words are provided in a sequence to the digital power amplifier, which generates a corresponding radio-frequency (RF) analog signal.
Abstract translation: 使用同相（I）和正交（Q）数据字作为参数来评估预失真函数，而根据I和Q数据字与满量程值的比较来生成加法I和Q数据字 数字功率放大器中的最大电流。 加法I和Q数据字被加到计算的I和Q数据字中，以产生预失真的I和Q数据字。 预失真的I和Q数据字按照序列提供给数字功率放大器，其产生相应的射频（RF）模拟信号。
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公开(公告)号：US08964875B2
公开(公告)日：2015-02-24
申请号：US13913771
申请日：2013-06-10
Applicant: MStar Semiconductor, Inc.
Inventor： Khurram Muhammad
CPC classification number: H04B1/16 , H04L27/2278 , H04L27/364
Abstract: A transceiver includes an input node to receive an input signal having in-phase (I) data and quadrature (Q) data, the input signal including several data samples. A correlation module determines an autocorrelation of the in-phase data, an autocorrelation of the quadrature data, a difference between the autocorrelation of the in-phase data and the autocorrelation of the quadrature data, and a cross correlation between the in-phase data and the quadrature data. An averaging module determines an average of the difference between the autocorrelation of the in-phase data and the autocorrelation of the quadrature data, and an average of the cross correlation between the in-phase data and the quadrature data, in which the averages are determined over a specified number of data samples. A compensation module, based on the average difference between the autocorrelation of the in-phase data and the autocorrelation of the quadrature data, and the average cross correlation between the in-phase data and the quadrature data, determines compensated in-phase data and quadrature data having reduced IQ mismatch.
Abstract translation: 收发器包括用于接收具有同相（I）数据和正交（Q）数据的输入信号的输入节点，所述输入信号包括若干数据采样。 相关模块确定同相数据的自相关，正交数据的自相关，同相数据的自相关与正交数据的自相关之间的差异以及同相数据与 正交数据。 平均模块确定同相数据的自相关和正交数据的自相关之间的差的平均值以及同相数据和正交数据之间的互相关的平均值，其中确定平均值 超过指定数量的数据样本。 补偿模块基于同相数据的自相关和正交数据的自相关之间的平均差异以及同相数据与正交数据之间的平均互相关来确定补偿的同相数据和正交 数据具有降低的IQ失配。
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8.发明授权Method and apparatus for synthesizing a low phase noise frequency with wide tuning range 有权用于合成具有宽调谐范围的低相位噪声频率的方法和装置公开(公告)号：US08810286B1
公开(公告)日：2014-08-19
申请号：US13875829
申请日：2013-05-02
Applicant: MStar Semiconductor, Inc.
Inventor： Khurram Muhammad , Chih-Ming Hung
IPC: H03K19/082 , H03K19/094 , H03L7/16
CPC classification number: H03L7/16
Abstract: Direct digital frequency synthesis is the process by which a digital frequency synthesizer component may output a stable, precise clock frequency at any of a broad range of possible frequency output values for any number of applications, usually across an integrated circuit. The digital frequency synthesizer set forth in this disclosure is a combination of a controller configured to receive a frequency control word and generate a first frequency control sub-word and a second frequency control sub-word based on the frequency control word, a frequency generator configured to generate a source frequency within a first predetermined frequency range based on the first frequency control sub-word, and a variable frequency divider configured to generate an output frequency within a second predetermined range based on the second frequency control sub-word and the source frequency.
Abstract translation: 直接数字频率合成是数字频率合成器组件可以在通常跨集成电路的任何数量的应用的可能的频率输出值的任何范围内输出稳定，精确的时钟频率的过程。 本公开中提出的数字频率合成器是被配置为接收频率控制字并基于频率控制字产生第一频率控制子字和第二频率控制子字的控制器的组合，频率发生器被配置 基于第一频率控制子字，在第一预定频率范围内产生源频率，以及可变分频器，其被配置为基于第二频率控制子字和源频率在第二预定范围内生成输出频率 。
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公开(公告)号：US09035808B2
公开(公告)日：2015-05-19
申请号：US14283301
申请日：2014-05-21
Applicant: MStar Semiconductor, Inc.
Inventor： Ming-Yu Hsieh , Shih-Chieh Yen , Khurram Muhammad
CPC classification number: H03M1/66 , H03H17/0294 , H03H17/0621 , H03M3/30 , H03M3/496 , H03M3/498
Abstract: A communication system including a configurable sample rate converter and a controller is provided. The configurable sample rate converter, configured to convert a digital signal with a first sample rate to a converted signal with a second sample rate, being operable in one of a first configuration and a second configuration. The controller, configured to dynamically control the sample rate converter to operate in one of the first configuration and the second configuration according to at least one condition.
Abstract translation: 提供了包括可配置采样率转换器和控制器的通信系统。 可配置采样率转换器，被配置为将具有第一采样率的数字信号转换为具有第二采样率的转换信号，其可在第一配置和第二配置中的一个中操作。 控制器被配置为根据至少一个条件动态地控制采样率转换器以工作在第一配置和第二配置之一中。
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10.发明授权公开(公告)号：US08971829B2
公开(公告)日：2015-03-03
申请号：US13946387
申请日：2013-07-19
Applicant: MStar Semiconductor, Inc.
Inventor： Khurram Muhammad
CPC classification number: H03F1/3241 , H03F1/3247 , H03F1/34 , H03F3/195 , H03F3/21 , H03F3/24 , H03F3/245 , H03F3/45071 , H03F3/45475 , H03F2200/336 , H03F2201/3233 , H04B1/0475 , H04B2001/0425 , H04B2001/0433
Abstract: To estimate complex factors for use in predistortion of a power amplifier, a complex factor is selected a set of complex factors a computation interval. A solution value is estimated for the selected complex factor during the computation interval by an iterative computation that constrains the estimated solution value towards a final solution value over an arbitrary number of iterations that is not bounded by the duration of the computation interval. A cumulative error in the estimated solution value is computed at each iteration over consecutive computation intervals. From the cumulative error, it is determined whether a convergence criterion is met and, if so, the estimating is terminated. The termination occurs independently of the solution value estimated for any one of the complex factors in the set.
Abstract translation: 为了估计在功率放大器预失真中使用的复杂因子，复杂因素是选择一组复杂因子的计算间隔。 在计算间隔期间通过迭代计算对所选择的复数因子估计解值，该迭代计算将估计的解值限制在不受计算间隔的持续时间限制的任意数量的迭代上的最终解值。 在连续计算间隔的每次迭代中计算估计解值的累积误差。 从累积误差确定是否满足收敛标准，如果是，则终止估计。 终止发生与集合中任何一个复杂因子估计的解值无关。
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