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16 条记录 (耗时 0.017 秒)

    Two-stage LNA with good linearity
    1.
    发明授权
    Two-stage LNA with good linearity 有权
    两级LNA线性好

    公开(公告)号：US06407640B1

    公开(公告)日：2002-06-18

    申请号：US09667901

    申请日：2000-09-22

    申请人： Vladimir Aparin ,  Peter Jivan Shah

    发明人： Vladimir Aparin ,  Peter Jivan Shah

    IPC分类号： H03F3191

    CPC分类号： H03F3/191 ,  H03F1/22 ,  H03F1/302 ,  H03F2200/294 ,  H03F2200/372

    摘要： A two-stage stacked high IIP3 LNA with low current consumption is presented. Low-impedance bias terminations and optimum inter-stage match are used for IIP3 enhancement. A new graphical design technique is introduced for optimizing the linearity trade-offs in two-stage amplifiers and for optimizing the on-chip inter-stage matching network. Also, novel active circuits for bias modulation suppression are discussed. The LNA has been fabricated in a commercial SiGe BiCMOS technology, and measurement results are presented.

    摘要翻译： 提出了一种具有低电流消耗的两级堆叠高IIP3 LNA。 低阻抗偏置端子和最佳级间匹配用于IIP3增强。 引入了一种新的图形设计技术，用于优化两级放大器中的线性折中和优化片上级间匹配网络。 此外，讨论了用于偏置调制抑制的新颖的有源电路。 LNA已经以商业SiGe BiCMOS技术制造，并提供了测量结果。

    Tracking filter for tuner
    2.
    发明授权
    Tracking filter for tuner 有权
    调谐器跟踪滤波器

    公开(公告)号：US08340616B2

    公开(公告)日：2012-12-25

    申请号：US11302876

    申请日：2005-12-14

    申请人： Peter Jivan Shah ,  YongSik Youn ,  Martin Christopher Alderton

    发明人： Peter Jivan Shah ,  YongSik Youn ,  Martin Christopher Alderton

    IPC分类号： H04B1/10

    CPC分类号： H03H7/0153 ,  H03J5/244 ,  H03J2200/10 ,  H03J2200/32

    摘要： A tuner uses a bank of tracking filters to preselect a channel to be received. Each tracking filter covers a range of frequencies. The tracking filters are tunable in frequency using switched capacitors and are tunable in gain by using switched resistors. The switched resistors can be controlled by an automatic gain control circuit that monitors the selected signal and adjust the tracking filter gain to achieve a desired signal level. A switch directs the received signal or signal from a test tone generator into the tracking filters. The test tone, generated by a frequency agile circuit, can be used to calibrate the filters, both in frequency and gain.

    摘要翻译： 调谐器使用一组跟踪滤波器来预选要接收的频道。 每个跟踪滤波器覆盖一定范围的频率。 跟踪滤波器在频率上是可调谐的，使用开关电容器，并且通过使用开关电阻可调谐增益。 开关电阻可以由自动增益控制电路控制，该电路监视所选择的信号并调整跟踪滤波器增益以实现期望的信号电平。 开关将来自测试音发生器的接收信号或信号引导到跟踪滤波器中。 由频率敏捷电路产生的测试音可用于校准频率和增益的滤波器。

    Distortion reduction calibration
    3.
    发明授权
    Distortion reduction calibration 有权
    失真校正

    公开(公告)号：US07949306B2

    公开(公告)日：2011-05-24

    申请号：US11077696

    申请日：2005-03-10

    申请人： Peter Jivan Shah

    发明人： Peter Jivan Shah

    IPC分类号： H04B17/00

    CPC分类号： H04B1/12 ,  H04B1/30 ,  H04B17/10 ,  H04B17/20

    摘要： Techniques are disclosed for compensating for second-order distortion in a wireless communication device. In a zero-intermediate frequency (IF) or low-IF architecture, IM2 distortion generated by the mixer (20) results in undesirable distortion levels in the baseband output signal. A compensation circuit (104) provides a measure of the IM2 distortion current independent of the radio frequency (RF) pathway to generate an IM2 calibration current. The IM2 calibration current is combined with the baseband output signal to thereby eliminate the IM2 currents generated within the RF pathway. In one embodiment, the calibration is provided at the factory during final testing. In alternative embodiment, additional circuitry (156, 158) may be added to the wireless communication device to provide a pathway between the transmitter (150) and the receiver (146). The transmitter signal is provided to the receiver to permit automatic calibration of the unit. An internal signal source (162) may be used in place of the transmitter (150). The auto-calibration may be performed to eliminate IM2 distortion or permit optimization of the circuit to minimize other forms of distortion or interference.

    摘要翻译： 公开了用于补偿无线通信设备中的二阶失真的技术。 在零中频（IF）或低IF架构中，由混频器（20）产生的IM2失真导致基带输出信号中不期望的失真电平。 补偿电路（104）提供独立于射频（RF）路径的IM2失真电流的测量以产生IM2校准电流。 IM2校准电流与基带输出信号组合，从而消除在RF通路内产生的IM2电流。 在一个实施例中，在最终测试期间在工厂提供校准。 在替代实施例中，附加电路（156,158）可以被添加到无线通信设备以提供发射机（150）和接收机（146）之间的路径。 发射机信号被提供给接收机以允许对该装置进行自动校准。 可以使用内部信号源（162）来代替发射器（150）。 可以执行自动校准以消除IM2失真或允许电路的优化以最小化其他形式的失真或干扰。

    Variable bandwidth tunable silicon duplexer
    4.
    发明授权
    Variable bandwidth tunable silicon duplexer 有权
    可变带宽可调硅双工器

    公开(公告)号：US08324984B2

    公开(公告)日：2012-12-04

    申请号：US12917149

    申请日：2010-11-01

    申请人： Daniel Timothy Gavin ,  Peter Jivan Shah

    发明人： Daniel Timothy Gavin ,  Peter Jivan Shah

    IPC分类号： H03H7/46

    CPC分类号： H03H7/463

    摘要： A tunable duplexer using voltage-controlled varactors is presented. The center frequency, the pass band, and the stop band are each tunable to meet system requirements. A calibration circuit driving digital to analog converters produces the necessary voltages used in the resonant circuits. The tunable duplexer can be fabricated on a single silicon chip. On-chip transformers can be used to reduce the voltage level of signals in the filters to improve the linearity of the duplexer.

    摘要翻译： 提出了使用压控变容二极管的可调谐双工器。 中心频率，通带和阻带均可调整，以满足系统要求。 驱动数模转换器的校准电路产生谐振电路中所需的电压。 可调谐双工器可以在单个硅芯片上制造。 片上变压器可用于降低滤波器中信号的电压电平，从而提高双工器的线性度。

    Multi-standard baseband receiver
    5.
    发明授权
    Multi-standard baseband receiver 有权
    多标准基带接收机

    公开(公告)号：US07415088B2

    公开(公告)日：2008-08-19

    申请号：US10123841

    申请日：2002-04-15

    申请人： Vincenzo Filip Andre Peluso ,  Seyfollah Bazarjani ,  Peter Jivan Shah ,  James Jaffee

    发明人： Vincenzo Filip Andre Peluso ,  Seyfollah Bazarjani ,  Peter Jivan Shah ,  James Jaffee

    IPC分类号： H04L7/00

    CPC分类号： H04B1/16

    摘要： Techniques for processing incoming signals conforming to a plurality of standards or communication formats with a single baseband receive section are disclosed. In one aspect, a plurality of analog processing components are adjusted in response to a format select signal, set according to one of a plurality of supported formats or standards. In another aspect, the operating mode of an A/D converter is tuned in response to the format select signal. In yet another aspect, the response characteristics of a jammer filter are tuned in response to the format select signal. In yet another aspect, the adjustment of the plurality of analog processing components is carried out by varying the frequency of a sample clock in response to the format select signal. Various other aspects are also presented. These aspects have the benefit of allowing a single baseband receive section to be deployed to process analog signals conforming to a plurality of communications standards or formats, in a power and area efficient manner.

    摘要翻译： 公开了用于处理符合多个标准或与单个基带接收部分的通信格式的输入信号的技术。 在一个方面，响应于根据多种支持的格式或标准之一设置的格式选择信号来调整多个模拟处理组件。 在另一方面，响应于格式选择信号来调整A / D转换器的工作模式。 在另一方面，响应于格式选择信号来调谐干扰滤波器的响应特性。 在另一方面，通过响应于格式选择信号改变采样时钟的频率来执行多个模拟处理组件的调整。 还提出了各种其他方面。 这些方面的好处是允许单个基带接收部分以功率和区域有效的方式被部署来处理符合多个通信标准或格式的模拟信号。

    Distortion reduction for variable capacitance devices
    7.
    发明授权
    Distortion reduction for variable capacitance devices 有权
    可变电容器件的失真减少

    公开(公告)号：US07548136B1

    公开(公告)日：2009-06-16

    申请号：US11758562

    申请日：2007-06-05

    申请人： Peter Jivan Shah

    发明人： Peter Jivan Shah

    IPC分类号： H03H7/00 ,  H03H11/00

    CPC分类号： H03H7/0107

    摘要： The present invention reduces distortion in variable capacitance devices by connecting a circuit to the variable capacitance devices that has low impedance at predetermined frequencies to suppress those frequencies and also suppress harmonics and mixing products resulting from mixing of various frequencies.

    摘要翻译： 本发明通过将电路连接到以预定频率具有低阻抗的可变电容器件来抑制这些频率并且还抑制由各种频率的混合产生的谐波和混合产物来减少可变电容器件中的失真。

    Tuner design and system for lossless interconnect of multiple tuners
    8.
    发明授权
    Tuner design and system for lossless interconnect of multiple tuners 有权
    调谐器设计和系统，用于多个调谐器的无损互连

    公开(公告)号：US07519339B2

    公开(公告)日：2009-04-14

    申请号：US11298147

    申请日：2005-12-09

    申请人： Peter Jivan Shah

    发明人： Peter Jivan Shah

    IPC分类号： H04B1/18

    CPC分类号： H04B1/18 ,  H03H7/38 ,  H03J1/0083 ,  H04B1/005 ,  H04B1/006

    摘要： Tuners with high input impedance are connected to a common radio frequency (RF) signal source. A termination load external to the tuners provides matched impedance loading for the transmission line or cable driving the tuners. Alternatively, the termination load can be located inside one tuner with a switch to enable or disable the load. All tuners receive the same signal and no signal degradation is caused when connecting multiple tuners. The multiple tuner connection is useful in television signal receiving devices that receive more than one independent channel, such as digital video recorders or picture-in-picture television receivers.

    摘要翻译： 具有高输入阻抗的调谐器连接到公共射频（RF）信号源。 调谐器外部的终端负载为驱动调谐器的传输线或电缆提供匹配的阻抗负载。 或者，终端负载可以位于具有开关的一个调谐器内部以启用或禁用负载。 所有调谐器接收相同的信号，并且在连接多个调谐器时不会引起信号衰减。 该多调谐器连接在接收多于一个独立信道的电视信号接收设备中是有用的，例如数字录像机或画中画电视接收机。

    Distortion reduction in a wireless communication device
    9.
    发明授权
    Distortion reduction in a wireless communication device 有权
    无线通信设备的失真减少

    公开(公告)号：US07139543B2

    公开(公告)日：2006-11-21

    申请号：US10066072

    申请日：2002-02-01

    申请人： Peter Jivan Shah

    发明人： Peter Jivan Shah

    IPC分类号： H04B1/10

    CPC分类号： H04B1/7101 ,  H04B1/123

    摘要： The present invention provides a technique for cancellation of jammer signals in a radio frequency receiver. A radio frequency signal contains both a desirable signal and an undesirable jammer signal. The combined signal is processed with a filter (104) to extract only the undesirable jammer signal. The jammer signal is then added (104) back to the combined signal to effectively cancel the jammer signal. The system may be implemented using a feedforward approach or a feedback approach. The resultant clean signal is processed in a conventional manner.

    摘要翻译： 本发明提供了一种在射频接收机中消除干扰信号的技术。 射频信号包含期望的信号和不期望的干扰信号。 组合信号用滤波器（104）处理，以仅提取不期望的干扰信号。 然后将干扰信号（104）加回到组合信号中，以有效地消除干扰信号。 可以使用前馈方法或反馈方法来实现该系统。 所得清洁信号以常规方式处理。