公开(公告)号：US20120208473A1

公开(公告)日：2012-08-16

申请号：US13101999

申请日：2011-05-05

申请人： Vladimir Aparin

发明人： Vladimir Aparin

IPC分类号： H04W88/02

CPC分类号： H04B1/0458 ,  H04B1/005 ,  H04B1/18

摘要： Front-end radio frequency (RF) filters with embedded impedance transformation are disclosed. In an exemplary design, an apparatus includes an active circuit and an RF filter. The active circuit receives an input signal and provides an output signal. The RF filter is operatively coupled to an antenna and the active circuit and performs filtering for the input signal or output signal. The RF filter is impedance matched to the active circuit and includes a non-LC filter. In an exemplary design, the active circuit includes a low noise amplifier (LNA), and the RF filter includes a receive (RX) filter having an output impedance that is matched to an input impedance of the LNA. In another exemplary design, the active circuit includes a power amplifier, and the RF filter includes a transmit (TX) filter having an input impedance that is matched to an output impedance of the power amplifier.

摘要翻译： 公开了具有嵌入式阻抗变换的前端射频（RF）滤波器。 在示例性设计中，装置包括有源电路和RF滤波器。 有源电路接收输入信号并提供输出信号。 RF滤波器可操作地耦合到天线和有源电路，并且对输入信号或输出信号执行滤波。 RF滤波器与有源电路阻抗匹配，并包括非LC滤波器。 在示例性设计中，有源电路包括低噪声放大器（LNA），并且RF滤波器包括具有与LNA的输入阻抗匹配的输出阻抗的接收（RX）滤波器。 在另一示例性设计中，有源电路包括功率放大器，并且RF滤波器包括具有与功率放大器的输出阻抗匹配的输入阻抗的发射（TX）滤波器。

公开(公告)号：US20110270590A1

公开(公告)日：2011-11-03

申请号：US12776180

申请日：2010-05-07

申请人： Vladimir Aparin ,  Robert P. Gilmore

发明人： Vladimir Aparin ,  Robert P. Gilmore

IPC分类号： G06F17/10

CPC分类号： H03M7/30 ,  G06K9/00496 ,  H03F1/3258

摘要： Compressed sensing is used to determine a model of a nonlinear system. In one example, L1-norm minimization is used to fit a generic model function to a set of samples thereby obtaining a fitted model. Convex optimization can be used to determine model coefficients that minimize the L1-norm. In one application, the fitted model is used to calibrate a predistorter. In another application, the fitted model function is used to predict future actions of the system. The generic model is made of up of constituent functions that may or may not be orthogonal to one another. In one example, an initial model function of non-orthogonal constituent functions is orthogonalized to generate a generic model function of constituent orthogonal functions. Although the number of samples to which the generic model is fitted can be less than the number of model coefficients, the fitted model nevertheless accurately models system nonlinearities.

摘要翻译： 压缩感测用于确定非线性系统的模型。 在一个示例中，L1范数最小化用于将通用模型函数拟合到一组样本，从而获得拟合模型。 可以使用凸优化来确定最小化L1范数的模型系数。 在一个应用中，拟合模型用于校准预失真器。 在另一个应用中，拟合模型函数用于预测系统的未来动作。 通用模型由可能彼此或可能不相互正交的组成函数构成。 在一个示例中，非正交组成函数的初始模型函数被正交化以生成组成正交函数的通用模型函数。 虽然通用模型拟合的样本数量可以小于模型系数的数量，但拟合模型仍然能够准确地模拟系统非线性。

公开(公告)号：US07902925B2

公开(公告)日：2011-03-08

申请号：US11285949

申请日：2005-11-22

申请人： Namsoo Kim ,  Kenneth Charles Barnett ,  Vladimir Aparin

发明人： Namsoo Kim ,  Kenneth Charles Barnett ,  Vladimir Aparin

IPC分类号： H03F1/22

CPC分类号： H03F1/223 ,  H03F1/3205 ,  H03F1/3276 ,  H03F2200/294 ,  H03F2200/372 ,  H04B1/525

摘要： An amplifier, which has good linearity and noise performance, includes first, second, third, and fourth transistors and an inductor. The first and second transistors are coupled as a first cascode pair, and the third and fourth transistors are coupled as a second cascode pair. The third transistor has its gate coupled to the source of the second transistor, and the fourth transistor has its drain coupled to the drain of the second transistor. The first transistor provides signal amplification. The second transistor provides load isolation and generates an intermediate signal for the third transistor. The third transistor generates distortion components used to cancel third order distortion component generated by the first transistor. The inductor provides source degeneration for the first transistor and improves distortion cancellation. The sizes of the second and third transistors are selected to reduce gain loss and achieve good linearity for the amplifier.

摘要翻译： 具有良好线性度和噪声性能的放大器包括第一，第二，第三和第四晶体管和电感器。 第一和第二晶体管作为第一共源共栅对耦合，并且第三和第四晶体管作为第二共源共栅对耦合。 第三晶体管的栅极耦合到第二晶体管的源极，并且第四晶体管的漏极耦合到第二晶体管的漏极。 第一个晶体管提供信号放大。 第二晶体管提供负载隔离并为第三晶体管产生中间信号。 第三晶体管产生用于消除由第一晶体管产生的三阶失真分量的失真分量。 电感器为第一晶体管提供源极退化并改善失真消除。 选择第二和第三晶体管的尺寸以减小增益损失并且为放大器获得良好的线性度。

公开(公告)号：US20100327932A1

公开(公告)日：2010-12-30

申请号：US12492541

申请日：2009-06-26

申请人： Vladimir Aparin ,  Gary J. Ballantyne

发明人： Vladimir Aparin ,  Gary J. Ballantyne

IPC分类号： H03H11/16

CPC分类号： H04B1/0475

摘要： Techniques for improving stability of a feedback system are described. In an exemplary design, the feedback system includes a forward path and a feedback path. The forward path receives an input signal and a rotated feedback signal and provides an output signal having a phase shift. The feedback path receives the output signal, generates a feedback signal, and rotates the feedback signal to obtain the rotated feedback signal having at least part of the phase shift removed. In another exemplary design, the feedback system includes a forward path and a feedback loop. The forward path receives a combined signal and provides an output signal having a phase shift. The feedback loop generates an error signal based on an input signal and the output signal, generates the combined signal based on the error signal and the input signal, and performs phase rotation to remove at least part of the phase shift.

摘要翻译： 描述了提高反馈系统稳定性的技术。 在示例性设计中，反馈系统包括前向路径和反馈路径。 正向路径接收输入信号和旋转的反馈信号，并提供具有相移的输出信号。 反馈路径接收输出信号，产生反馈信号，并且使反馈信号旋转以获得具有至少部分相移的旋转的反馈信号。 在另一示例性设计中，反馈系统包括前向路径和反馈回路。 正向路径接收组合信号并提供具有相移的输出信号。 反馈回路基于输入信号和输出信号产生误差信号，基于误差信号和输入信号产生组合信号，并执行相位旋转以去除至少部分相移。

公开(公告)号：US20100244927A1

公开(公告)日：2010-09-30

申请号：US12494068

申请日：2009-06-29

申请人： Vladimir Aparin ,  Namsoo Kim ,  Lennart K. Mathe

发明人： Vladimir Aparin ,  Namsoo Kim ,  Lennart K. Mathe

IPC分类号： G06G7/12

CPC分类号： H04B1/525 ,  H03F1/34 ,  H03F3/24 ,  H04B1/0475 ,  H04B1/109 ,  H04B1/123 ,  H04B2001/0433

摘要： Exemplary embodiments of the invention disclose signal filtering. In an exemplary embodiment, a filter device may comprise a subtractor operably coupled between an input and an output and configured to receive an input signal comprising a desired component and at least one undesired frequency component. The filter device may further include a feedback loop configured to receive at least one of the input signal and an output signal from the subtractor and convey a feedback signal comprising at least one undesired component to the subtractor. Each undesired component of the feedback signal corresponds to an associated undesired component of the input signal. Furthermore, the subtractor subtracts the feedback signal from the input signal and convey the output signal

摘要翻译： 本发明的示例性实施例公开了信号滤波。 在示例性实施例中，滤波器装置可以包括可操作地耦合在输入端和输出端之间并被配置为接收包括期望分量和至少一个不需要的频率分量的输入信号的减法器。 滤波器装置还可以包括反馈回路，其被配置为从减法器接收输入信号和输出信号中的至少一个，并将包括至少一个不期望的分量的反馈信号传送到减法器。 反馈信号的每个不期望的分量对应于输入信号的相关不期望的分量。 此外，减法器从输入信号中减去反馈信号并传送输出信号

公开(公告)号：US20100022206A1

公开(公告)日：2010-01-28

申请号：US12180350

申请日：2008-07-25

申请人： Vladimir Aparin ,  Aristotele Hadjichristos ,  Marco Cassia

发明人： Vladimir Aparin ,  Aristotele Hadjichristos ,  Marco Cassia

IPC分类号： H04B1/04

CPC分类号： H04B1/0475 ,  H03F1/34 ,  H03F3/24 ,  H04B2001/0433

摘要： Exemplary embodiments of the disclosure are directed to down-converting an RF signal of a transmitter to baseband, filtering the down-converted signal, and generating a composite signal based on the filtered down-converted signal and a transmission based-band signal.

摘要翻译： 本公开的示例性实施例涉及将发射机的RF信号下变频到基带，对下变频信号进行滤波，并且基于滤波的下变频信号和基于传输的频带信号来生成复合信号。

公开(公告)号：US20090221235A1

公开(公告)日：2009-09-03

申请号：US12366441

申请日：2009-02-05

申请人： Steven C. Ciccarelli ,  Frederic Bossu ,  Vladimir Aparin ,  Kevin H. Wang

发明人： Steven C. Ciccarelli ,  Frederic Bossu ,  Vladimir Aparin ,  Kevin H. Wang

IPC分类号： H03D3/24 ,  H04B7/00 ,  H04B17/00 ,  H04M1/00

CPC分类号： H03L7/1974

摘要： Within a receiver, the frequency of a comparison reference clock signal supplied to a fractional-N Phase-Locked Loop (PLL) is dynamically changed such that undesirable reciprocal mixing of reference spurs with known jammers (for example, transmit leakage) is minimized. As the transmit channel changes within a band, and as the transmit leakage frequency changes, a circuit changes the frequency of the comparison reference clock signal such that reference spurs generated by the PLL are moved in frequency so that they do not reciprocally mix with transmitter leakage in undesirable ways. In a second aspect, the PLL is operable either as an integer-N PLL or a fractional-N PLL. In low total receive power situations, the PLL operates as an integer-N PLL to reduce receiver susceptibility to fractional-N spurs. In a third aspect, jammer detect information is used to determine the comparison reference clock signal frequency.

摘要翻译： 在接收机内，提供给分数N锁相环（PLL）的比较参考时钟信号的频率被动态地改变，使得具有已知干扰的参考杂波（例如，传输泄漏）的不期望的相互混合被最小化。 当发射信道在频带内变化时，并且随着发射泄漏频率的变化，电路改变比较参考时钟信号的频率，使得PLL产生的参考杂波频率移动，使得它们不与发射机泄漏相互混合 以不良的方式。 在第二方面，PLL可以作为整数N个PLL或分数N PLL来操作。 在低总接收功率情况下，PLL作为整数N PLL进行操作，以减少接收机对分数N个杂散的敏感性。 在第三方面，使用干扰检测信息来确定比较参考时钟信号频率。

公开(公告)号：US20080242257A9

公开(公告)日：2008-10-02

申请号：US10920526

申请日：2004-08-17

申请人： Vladimir Aparin

发明人： Vladimir Aparin

IPC分类号： H03F3/04 ,  H04B1/28

CPC分类号： H03F3/193 ,  H03F1/223 ,  H03F1/301 ,  H03F1/3205 ,  H03F2200/108 ,  H03F2200/162 ,  H03F2200/24 ,  H03F2200/294 ,  H03F2200/372 ,  H03F2200/489 ,  H03F2200/492 ,  H03F2200/75

摘要： An amplifier comprises a source degeneration inductance and at least two field effect transistors coupled in parallel and having mutually different gate biasing. Source connections of the field effect transistors are coupled along different positions of the source degeneration inductance.

摘要翻译： 放大器包括源极退化电感和并联耦合并且具有相互不同的栅极偏置的至少两个场效应晶体管。 场效应晶体管的源极连接沿源极退化电感的不同位置耦合。

公开(公告)号：US20050107051A1

公开(公告)日：2005-05-19

申请号：US10792171

申请日：2004-03-02

申请人： Vladimir Aparin ,  Gary Ballantyne ,  Charles Persico

发明人： Vladimir Aparin ,  Gary Ballantyne ,  Charles Persico

IPC分类号： H04B1/52 ,  H04B1/00 ,  H01Q11/12 ,  H03C1/62 ,  H04B1/04 ,  H04B1/44 ,  H04B15/00 ,  H04B17/00

CPC分类号： H04B1/525

摘要： An adaptive filter suitable for fabrication on an RF integrated circuit and used for transmit (TX) leakage rejection in a wireless full-duplex communication system is described. The adaptive filter includes a summer and an adaptive estimator. The summer receives an input signal having a TX leakage signal and an estimator signal having an estimate of the TX leakage signal, subtracts the estimator signal from the input signal, and provides an output signal having the TX leakage signal attenuated. The adaptive estimator receives the output signal and a reference signal having a version of the transmit signal, estimates the TX leakage signal in the input signal based on the output signal and the reference signal, and provides the estimator signal. The adaptive estimator may utilize an LMS algorithm to minimize a mean square error between the TX leakage signal in the input signal and the TX leakage signal estimate in the estimator signal.

摘要翻译： 描述了适用于在RF集成电路上制造并用于无线全双工通信系统中的发射（TX）泄漏抑制的自适应滤波器。 自适应滤波器包括一个加法器和一个自适应估计器。 夏天接收具有TX泄漏信号的输入信号和具有TX泄漏信号的估计的估计信号，从输入信号中减去估计器信号，并且提供具有衰减的TX泄漏信号的输出信号。 自适应估计器接收输出信号和具有发射信号版本的参考信号，基于输出信号和参考信号估计输入信号中的TX泄漏信号，并提供估计器信号。 自适应估计器可以利用LMS算法来最小化输入信号中的TX泄漏信号与估计器信号中的TX泄漏信号估计之间的均方误差。

公开(公告)号：US06717463B2

公开(公告)日：2004-04-06

申请号：US09961460

申请日：2001-09-21

申请人： Vladimir Aparin ,  Peter J. Shah

发明人： Vladimir Aparin ,  Peter J. Shah

IPC分类号： H03F126

CPC分类号： H03F1/32 ,  H03F1/34 ,  H03F3/19

摘要： A radio frequency amplifier with improved linearity and minimal third-order distortion. The amplifier includes a first transistor having first, second and third terminals with the first terminal being an input terminal and the second terminal being the output terminal and the third terminal being a common terminal. A linearization circuit is included having first and second terminals. The first terminal is connected to the common terminal of the transistor and the second terminal is connected to the input terminal of the transistor. In a specific embodiment, the linearization circuit is implemented as a unity gain buffer with an input terminal connected to the common terminal of the transistor and an output terminal connected to the input terminal of the transistor. In accordance with the inventive teachings, the buffer has a low gain and high output impedance at first frequency (f1) of a first signal applied to the circuit and a second frequency (f2) of a second signal applied to the circuit and a unity gain and low output impedance a difference between the first and second frequencies. In another specific embodiment, the inductor is inserted between the output of the unity gain buffer and the input terminal of the transistor. In alternative embodiments, circuitry is shown for providing a direct current offset at the input of the transistor. As another alternative, the linearization circuit consists of series inductor and capacitor connected between the common and input terminals of the transistor. In yet another embodiment, the linearization circuit consists of the first and the second series inductor and capacitor circuits. The first series LC circuit is connected between the common terminal of the transistor and ground and the second series LC circuit is connected between the input terminal of the transistor and ground.

摘要翻译： 具有改善线性度和最小三阶失真的射频放大器。 放大器包括具有第一，第二和第三端子的第一晶体管，第一端子是输入端子，第二端子是输出端子，第三端子是公共端子。 包括具有第一和第二端子的线性化电路。 第一端子连接到晶体管的公共端子，第二端子连接到晶体管的输入端子。 在具体实施例中，线性化电路被实现为具有连接到晶体管的公共端子的输入端子和连接到晶体管的输入端子的输出端子的单位增益缓冲器。 根据本发明，缓冲器在施加到电路的第一信号的第一频率（f1）处施加低增益和高输出阻抗，以及施加到电路的第二信号的第二频率（f2）和单位增益 并且低输出阻抗是第一和第二频率之间的差。 在另一个具体实施例中，电感器插入在单位增益缓冲器的输出端和晶体管的输入端子之间。 在替代实施例中，示出了用于在晶体管的输入处提供直流偏移的电路。 作为另一种选择，线性化电路由连接在晶体管的公共端和输入端之间的串联电感和电容组成。 在另一个实施例中，线性化电路由第一和第二串联电感器和电容器电路组成。 第一串联LC电路连接在晶体管的公共端和地之间，第二串联LC电路连接在晶体管的输入端和地之间。