公开(公告)号：US07548593B2

公开(公告)日：2009-06-16

申请号：US11228090

申请日：2005-09-15

申请人： Puay Hoe Andrew See ,  Gary John Ballantyne ,  James Jaffee ,  Gurkanwal Kamal Sahota

发明人： Puay Hoe Andrew See ,  Gary John Ballantyne ,  James Jaffee ,  Gurkanwal Kamal Sahota

IPC分类号： H03C3/00

CPC分类号： H04L27/361 ,  H03C3/0966 ,  H03C3/0983

摘要： A phase modulator faithfully reproduces higher frequency modulation using an offset phase-locked loop (OPLL) without passing excessive noise through an increased bandwidth of the OPLL. A quadrature modulator modulates information from a baseband signal onto a passband IF signal and, after a limiter strips away amplitude variations, the OPLL reproduces the phase modulation on an RF signal. The OPLL introduces a group delay that does not vary linearly with the modulation frequency and that consequently causes distortion when uncompensated. A baseband filter filters the amplitude of the baseband signal and introduces a complementary group delay that compensates for the OPLL group delay and results in a combined group delay of the baseband filter, quadrature modulator, limiter and OPLL that remains substantially constant as modulation frequency varies. Compensating for the OPLL group delay reduces distortion and the spectral energy at offset frequencies from the carrier frequency of the RF signal.

摘要翻译： 相位调制器使用偏移锁相环（OPLL）忠实地再现更高的频率调制，而不会通过OPLL的带宽增加而过多的噪声。 正交调制器将信号从基带信号调制到通带IF信号上，并且在限幅器剥离幅度变化之后，OPLL再现RF信号上的相位调制。 OPLL引入了不随调制频率线性变化的群延迟，从而导致无补偿时的失真。 基带滤波器对基带信号的幅度进行滤波，并引入补偿组延迟，补偿OPLL组延迟，并导致基带滤波器，正交调制器，限幅器和OPLL的组合群延迟，其随调制频率变化而保持基本恒定。 补偿OPLL组延迟可以减少偏移频率下的失真和频谱能量与RF信号的载波频率。

公开(公告)号：US07145395B2

公开(公告)日：2006-12-05

申请号：US10944145

申请日：2004-09-16

申请人： Prasad Gudem ,  Gurkanwal Kamal Sahota

发明人： Prasad Gudem ,  Gurkanwal Kamal Sahota

IPC分类号： H03G3/12

CPC分类号： H03F3/45085 ,  H03F1/3211 ,  H03F3/45179 ,  H03F2203/45352 ,  H03F2203/45384 ,  H03F2203/45392

摘要： A transconductance cell is disclosed. The transconductance cell may be single-ended or differential. The transconductance cell may include a tunable degeneration circuit. The tunable degeneration circuit may have a plurality of field effect transistors connected in series with each of the field effect transistors having a gate configured to receive a tuning voltage.

摘要翻译： 公开了一种跨导电池。 跨导单元可以是单端或差分。 跨导单元可以包括可调变性电路。 可调谐退化电路可以具有与具有配置为接收调谐电压的栅极的每个场效应晶体管串联连接的多个场效应晶体管。

公开(公告)号：US09026070B2

公开(公告)日：2015-05-05

申请号：US10993011

申请日：2004-11-18

申请人： Charles J. Persico ,  Kevin Gard ,  Gurkanwal Kamal Sahota ,  Shinichi Miyazaki ,  Steven C. Ciccarelli

发明人： Charles J. Persico ,  Kevin Gard ,  Gurkanwal Kamal Sahota ,  Shinichi Miyazaki ,  Steven C. Ciccarelli

IPC分类号： H04B17/02 ,  H04K3/00 ,  H04B1/10 ,  H04B7/08 ,  H04B1/16

CPC分类号： H04K3/224 ,  H04B1/109 ,  H04B7/082

摘要： A low-power diversity receiver includes at least two receive paths, each of which is designated as a primary or secondary receive path. A primary receive path is compliant with system requirements (e.g., IS-98D requirements). A secondary receive path is not fully compliant with the system requirements and is designed for lower power, less area, and lower cost than the primary receive path. For a multi-antenna receiver, the two receive paths may be used to simultaneously process two received signals from two antennas. For a single-antenna receiver, either the primary or secondary receive path is selected, e.g., depending on whether or not large amplitude “jammers” are detected, to process a single input signal from one antenna. The receiver may include additional receive paths for additional frequency bands and/or GPS.

摘要翻译： 低功率分集接收器包括至少两个接收路径，每个接收路径被指定为主要或次要接收路径。 主要接收路径符合系统要求（例如，IS-98D要求）。 次要接收路径不完全符合系统要求，并且设计为比主接收路径更低的功率，更少的面积和更低的成本。 对于多天线接收机，两个接收路径可以用于同时处理来自两个天线的两个接收信号。 对于单天线接收机，例如，取决于是否检测到大的振幅“干扰”，选择主要或次要接收路径来处理来自一个天线的单个输入信号。 接收机可以包括用于附加频带和/或GPS的附加接收路径。

公开(公告)号：US07915954B2

公开(公告)日：2011-03-29

申请号：US10987360

申请日：2004-11-12

申请人： Arun Raghupathy ,  Puay Hoe See ,  Gurkanwal Kamal Sahota ,  Robert Reeves ,  Paul E. Peterzell

发明人： Arun Raghupathy ,  Puay Hoe See ,  Gurkanwal Kamal Sahota ,  Robert Reeves ,  Paul E. Peterzell

IPC分类号： H03F3/68

CPC分类号： H03F1/3247 ,  H03F1/0222 ,  H03F1/3282 ,  H03F2201/3233 ,  H03G3/3047

摘要： Methods and apparatus for amplifier AM and PM predistortion and autocalibration. AM and PM amplifier distortion can be corrected using predistortion. The AM and PM distortion characteristics of the amplifier are determined using an autocalibration technique. The amplifier characteristics can be stored in distinct look up tables. Alternatively, the inverse of the amplifier characteristics can be stored in distinct look up tables. Signals that are to be amplified are characterized in polar format having a phase component with a normalized magnitude and a magnitude component. The phase component can be predistorted by applying the inverse of the PM distortion characteristics to the signal. Similarly, the magnitude component can be predistorted by applying the inverse of the AM distortion characteristics to the signal. The predistorted phase component can be amplified using the previously characterized amplifier. The predistorted magnitude component can be used to set the gain of the previously characterized amplifier.

摘要翻译： 放大器AM和PM预失真和自动校准的方法和装置。 AM和PM放大器失真可以使用预失真校正。 使用自动校准技术确定放大器的AM和PM失真特性。 放大器特性可以存储在不同的查找表中。 或者，放大器特性的倒数可以存储在不同的查找表中。 要被放大的信号的特征在于具有归一化幅度和幅度分量的相位分量的极化格式。 通过将PM失真特性的反相应用于信号，可以对相位分量进行预失真。 类似地，幅度分量可以通过将AM失真特性的反相应用于信号来预失真。 可以使用先前描述的放大器来放大预失真相位分量。 预失真幅度分量可用于设置先前表征的放大器的增益。