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98 条记录 (耗时 0.043 秒)

    METHOD AND APPARATUS FOR CALIBRATING A PHASE LOCKED LOOP IN OPEN-LOOP.
    43.
    发明申请
    METHOD AND APPARATUS FOR CALIBRATING A PHASE LOCKED LOOP IN OPEN-LOOP. 有权
    用于校准开环中相位锁定环路的方法和装置。

    公开(公告)号：US20080079509A1

    公开(公告)日：2008-04-03

    申请号：US11540878

    申请日：2006-09-29

    申请人： Louie Serrano ,  Alireza Zolfaghari ,  Paul Lettieri ,  Hea Joung Kim ,  Hooman Darabi ,  Henrik Jensen ,  Behnam Mohammadi

    发明人： Louie Serrano ,  Alireza Zolfaghari ,  Paul Lettieri ,  Hea Joung Kim ,  Hooman Darabi ,  Henrik Jensen ,  Behnam Mohammadi

    IPC分类号： H03L1/00

    CPC分类号： H03L7/0898 ,  H03L7/10 ,  H03L7/18

    摘要： Methods and apparatus for calibrating a transitional loop, such as a phase locked loop, are disclosed. An example method includes performing an open loop calibration of a voltage controlled oscillator (VCO). The open loop calibration includes tuning the output oscillation frequency of the VCO to within a predetermined range of frequencies. The example method further includes determining a voltage offset and a gain error of an analog to digital converter (ADC) coupled with the phase locked loop. The example method also includes determining a gain offset of the open loop calibrated VCO using the voltage offset and the gain error of the ADC. In the example method, a signal provided by a charge pump of the PLL is adjusted based on the determined gain offset.

    摘要翻译： 公开了用于校准过渡环路的方法和装置，例如锁相环路。 示例性方法包括执行压控振荡器（VCO）的开环校准。 开环校准包括将VCO的输出振荡频率调谐到预定频率范围内。 示例性方法还包括确定与锁相环耦合的模数转换器（ADC）的电压偏移和增益误差。 示例性方法还包括使用电压偏移和ADC的增益误差来确定开环校准的VCO的增益偏移。 在示例性方法中，基于所确定的增益偏移来调整由PLL的电荷泵提供的信号。

    Method and apparatus for I/Q imbalance compensation
    44.
    发明申请
    Method and apparatus for I/Q imbalance compensation 有权
    用于I / Q不平衡补偿的方法和装置

    公开(公告)号：US20070291883A1

    公开(公告)日：2007-12-20

    申请号：US11452824

    申请日：2006-06-14

    申请人： Jared Welz ,  Henrik Jensen

    发明人： Jared Welz ,  Henrik Jensen

    IPC分类号： H04B1/10

    CPC分类号： H04B1/30 ,  H03D3/009

    摘要： Various embodiments are disclosed relating to a wireless transceiver. In an example embodiment, a method of compensating for phase imbalance and amplitude imbalance between corresponding in-phase signals and quadrature-phase signals includes providing a plurality of test tones of various frequencies to a receiver and determining, for each of the test tones, a respective phase imbalance and a respective amplitude imbalance between an in-phase (I) signal and a quadrature-phase (Q) signal of the test tone. The example method also includes determining a set of filter coefficients based on the determined phase and amplitude imbalances of the plurality of test tones and applying the set of filter coefficients to a plurality of filters. In the example method, a phase imbalance between an I signal and a Q signal of a received wireless signal is compensated for using a first filter of the plurality of filters. Further, an amplitude imbalance between the I and Q signals of the received wireless signal is compensated for using a second filter of the plurality of filters.

    摘要翻译： 公开了关于无线收发器的各种实施例。 在示例性实施例中，补偿相应同步信号和正交相位信号之间的相位不平衡和幅度不平衡的方法包括向接收机提供各种频率的多个测试音调并且为每个测试音调确定一个 相位不平衡和测试音的同相（I）信号和正交相位（Q）信号之间的相应振幅不平衡。 该示例性方法还包括基于所确定的多个测试音调的相位和幅度不平衡以及将该组滤波器系数应用于多个滤波器来确定一组滤波器系数。 在示例性方法中，使用多个滤波器的第一滤波器来补偿接收到的无线信号的I信号和Q信号之间的相位不平衡。 此外，使用多个滤波器的第二滤波器来补偿所接收的无线信号的I信号和Q信号之间的幅度不平衡。

    Method and system for digital to analog conversion for power amplifier driver amplitude modulation
    45.
    发明申请
    Method and system for digital to analog conversion for power amplifier driver amplitude modulation 失效
    用于功率放大器驱动器幅度调制的数模转换方法和系统

    公开(公告)号：US20070268168A1

    公开(公告)日：2007-11-22

    申请号：US11436348

    申请日：2006-05-18

    申请人： Henrik Jensen ,  Alireza Zolfaghari

    发明人： Henrik Jensen ,  Alireza Zolfaghari

    IPC分类号： H03M3/00

    CPC分类号： H03M7/3008 ,  H03M1/0673 ,  H03M3/502 ,  H03M7/3026 ,  H03M7/3042 ,  H04L27/361

    摘要： Aspects of a method and system for digital to analog conversion for power amplifier driver amplitude modulation are presented. Various aspects of the system may include circuitry that enables oversampling, within a single integrated circuit device, of each of a plurality of samples in a digital baseband signal. The circuitry may enable reduction of a number of bits, i.e., coarse quantization, in each of the oversampled plurality of samples so as to cause displacement of the quantization noise that occurred as a result of the coarse quantization. A subsequent signal may be generated based on the oversampled signal. The circuitry may enable the subsequent signal to be low-pass filtered utilizing filter circuitry in the single integrated circuit device, thereby attenuating the quantization noise displaced into the higher frequency range of the oversampled signal.

    摘要翻译： 提出了用于功率放大器驱动器幅度调制的数模转换方法和系统的方面。 系统的各个方面可以包括能够在单个集成电路装置内对数字基带信号中的多个采样中的每一个进行过采样的电路。 该电路可以使得在每个过采样的多个采样中减少多个位，即粗略量化，以便导致作为粗量化的结果而发生的量化噪声的位移。 可以基于过采样信号产生后续信号。 该电路可以使得后续信号可以利用单个集成电路器件中的滤波器电路进行低通滤波，从而衰减位移到过采样信号的较高频率范围内的量化噪声。

    Power control techniques for wireless transmitters
    46.
    发明申请
    Power control techniques for wireless transmitters 有权
    无线发射机功率控制技术

    公开(公告)号：US20070230616A1

    公开(公告)日：2007-10-04

    申请号：US11395907

    申请日：2006-03-31

    申请人： Alireza Zolfaghari ,  Henrik Jensen ,  Hooman Darabi

    发明人： Alireza Zolfaghari ,  Henrik Jensen ,  Hooman Darabi

    IPC分类号： H04L25/49

    CPC分类号： H04B1/406 ,  H03F3/24 ,  H04B2001/0408 ,  H04L27/0008

    摘要： Various embodiments are disclosed relating to power control techniques for wireless transmitters. In an example embodiment, an apparatus is provided that may include a digital-to-analog converter (DAC) adapted to convert a digital amplitude signal to an analog amplitude signal during a first transmission mode and adapted to convert a digital power level signal to an analog power level signal during a second transmission mode.

    摘要翻译： 公开了关于无线发射机的功率控制技术的各种实施例。 在一个示例性实施例中，提供了一种可以包括数模转换器（DAC）的装置，其适于在第一传输模式期间将数字幅度信号转换为模拟幅度信号，并且适于将数字功率电平信号转换为 在第二传输模式期间的模拟功率电平信号。

    Channel-select decimation filter with programmable bandwidth
    47.
    发明申请
    Channel-select decimation filter with programmable bandwidth 失效
    具有可编程带宽的通道选择抽取滤波器

    公开(公告)号：US20070027943A1

    公开(公告)日：2007-02-01

    申请号：US11189910

    申请日：2005-07-26

    申请人： Henrik Jensen ,  Brima Ibrahim

    发明人： Henrik Jensen ,  Brima Ibrahim

    IPC分类号： G06F17/10

    CPC分类号： H04L27/38 ,  H03H17/0664 ,  H03H17/0671

    摘要： A channel-select decimation filter capable of operating in multiple bandwidth modes includes a first low pass filter stage, a variable gain stage, a subtraction module a second low pass filter stage and a down-sampling module. The first low pass filter stage includes a first programmable delay module for filtering input signals to produce first low pass filtered signals. The variable gain stage applies a programmable gain to the input signals to produce gained input signals. The subtraction module subtracts the first low pass filtered signals from the gain input signals to produce first stage signals. The second low pass filter stage includes a second programmable delay module for filtering the first stage signals to produce channel-selected signals. The first programmable delay module, second programmable delay module and programmable gain are programmed to implement one of the multiple bandwidth modes.

    摘要翻译： 能够在多个带宽模式下工作的频道选择抽取滤波器包括第一低通滤波器级，可变增益级，减法模块，第二低通滤波级和下采样模块。 第一低通滤波器级包括用于滤波输入信号以产生第一低通滤波信号的第一可编程延迟模块。 可变增益级将可编程增益应用于输入信号以产生增益的输入信号。 减法模块从增益输入信号中减去第一低通滤波信号，以产生第一级信号。 第二低通滤波器级包括用于对第一级信号进行滤波以产生通道选择信号的第二可编程延迟模块。 第一可编程延迟模块，第二可编程延迟模块和可编程增益被编程以实现多种带宽模式之一。

    Data recovery system and applications thereof in radio receivers
    48.
    发明授权
    Data recovery system and applications thereof in radio receivers 失效

    公开(公告)号：US07154974B2

    公开(公告)日：2006-12-26

    申请号：US10074294

    申请日：2002-02-12

    申请人： Henrik Jensen ,  Brima Ibrahim

    发明人： Henrik Jensen ,  Brima Ibrahim

    IPC分类号： H04L7/00 ,  H03D3/00

    CPC分类号： H04B1/406

    摘要： A method and apparatus for data recovery includes processing that begins by receiving an encoded signal at a transmit symbol rate. Such an encoded signal includes data that is represented by positive and negative pulses. The processing continues by determining at least one reference crossing of the encoded signal (e.g., detecting a 0 crossing). The processing then continues by determining a sampling phase of a system symbol rate based on the reference crossing. The processing then continues by sampling the encoded signal at the determined sampling phase with respect to the system symbol rate to recapture the data.

    Glycosidase inhibitors and methods of synthesizing same
    49.
    发明申请
    Glycosidase inhibitors and methods of synthesizing same 有权
    糖苷酶抑制剂及其合成方法

    公开(公告)号：US20060247222A1

    公开(公告)日：2006-11-02

    申请号：US11368014

    申请日：2006-03-02

    申请人： Brian Pinto ,  Blair Johnston ,  Ahmad Ghavami ,  Monica Szczepina ,  Hui Liu ,  Kashinath Sadalapure ,  Henrik Jensen ,  Nag Kumar ,  Ravindranath Nasi

    发明人： Brian Pinto ,  Blair Johnston ,  Ahmad Ghavami ,  Monica Szczepina ,  Hui Liu ,  Kashinath Sadalapure ,  Henrik Jensen ,  Nag Kumar ,  Ravindranath Nasi

    IPC分类号： C07D345/00 ,  C07D333/32 ,  A61K31/396 ,  A61K31/381

    CPC分类号： C07D207/12 ,  C07D333/32 ,  C07D335/02 ,  C07D345/00 ,  C07D495/04

    摘要： Methods for synthesizing Salacinol, its stereoisomers, and analogues, homologues and other derivatives thereof potentially useful as glycosidase inhibitors are described. In some embodiments the compounds of the invention may have the general formula (I) or (II): The synthetic schemes may comprise reacting a cyclic sulfate with a 5-membered ring sugar containing a heteroatom (X). The heteroatom preferably comprises sulfur, selenium, or nitrogen. The cyclic sulfate and ring sugar reagents may be readily prepared from carbohydrate precursors, such as D-glucose, L-glucose, D-xylose and L-xylose. The target compounds are prepared by opening of the cyclic sulfates by nucleophilic attack of the heteroatoms on the 5-membered ring sugars. The resulting heterocyclic compounds have a stable, inner salt structure comprising a heteroatom cation and a sulfate anion. The synthetic schemes yield various stereoisomers of the target compounds in moderate to good yields with limited side-reactions. Chain-extended analogues of Salacinol are also described.

    摘要翻译： 描述了可能用作糖苷酶抑制剂的Salacinol，其立体异构体和类似物，同系物和其它衍生物的合成方法。 在一些实施方案中，本发明的化合物可具有通式（I）或（II）：合成方案可包括使环硫酸酯与含有杂原子（X）的5元环糖反应。 杂原子优选包含硫，硒或氮。 环状硫酸盐和环糖试剂可以容易地从碳水化合物前体如D-葡萄糖，L-葡萄糖，D-木糖和L-木糖制备。 通过在5元环糖上的杂原子的亲核攻击来打开环状硫酸盐来制备目标化合物。 所得的杂环化合物具有包含杂原子阳离子和硫酸根阴离子的稳定的内盐结构。 合成方案以有限的副反应以中等到良好的产率产生目标化合物的各种立体异构体。 还描述了Salacinol的链延长类似物。

    Skin reflectance model for representing and rendering faces
    50.
    发明申请
    Skin reflectance model for representing and rendering faces 失效
    用于表示和渲染面部的皮肤反射率模型

    公开(公告)号：US20060227137A1

    公开(公告)日：2006-10-12

    申请号：US11092426

    申请日：2005-03-29

    申请人： Tim Weyrich ,  Wojciech Matusik ,  Hanspeter Pfister ,  Henrik Jensen ,  Wai Ngan ,  Markus Gross

    发明人： Tim Weyrich ,  Wojciech Matusik ,  Hanspeter Pfister ,  Henrik Jensen ,  Wai Ngan ,  Markus Gross

    IPC分类号： G06T15/50

    CPC分类号： G06T15/50

    摘要： A face is scanned to obtain a three-dimensional geometry of the face, images are also acquired of the face, and subsurface scattering of the face is measured. A translucency map is determined from the subsurface reflectance. A total surface reflectance and a normal map are estimated from the three-dimensional geometry and the images, and diffuse reflectance is estimated using the total reflectance. An albedo map is determined from the diffuse reflectance. The diffuse reflectance is subtracted from the total reflectance to obtain a surface reflectance. A set of bi-directional reflectance functions is fitted to the surface reflectance. Then, the set of bi-directional reflectance distribution functions, the albedo map, and the translucency map are combined to form a skin reflectance model of the face.

    摘要翻译： 扫描面部以获得脸部的三维几何图像，并且还获取脸部的图像，并且测量脸部的表面下散射。 从地下反射率确定半透明度图。 从三维几何图像和图像估计总表面反射率和法线图，并且使用总反射率来估计漫反射。 从漫反射率确定反照率图。 从总反射率中减去漫反射，得到表面反射率。 一组双向反射函数适合表面反射率。 然后，将该组双向反射分布函数，反照率图和半透明度图组合，以形成面部的皮肤反射率模型。