公开(公告)号：BR9915672A

公开(公告)日：2001-11-13

申请号：BR9915672

申请日：1999-12-03

Applicant: QUALCOMM INC

Inventor： APARIN VLADIMIR ,  PERSICO CHARLES K

IPC: H03F1/32 ,  H03H11/28

Abstract: Techniques to reduce intermodulation distortion at the output of an active circuit having even-order and odd-order nonlinearities. The IM3 products generated by the even-order nonlinearity of the active circuit are canceled against the IM3 products generated by the odd-order nonlinearity. The amplitude and phase of the IM3 products can be manipulated by adjusting either the source or load impedance, or both, of the active circuit. The amplitude and phase of the IM2 products generated by the even-order nonlinearity can be manipulated by adjusting the impedance of the active circuit at sub-harmonic and second harmonic frequencies (i.e., the frequencies of the IM2 products). The amplitude and phase of the IM3 products generated by the odd-order nonlinearity can be manipulated by adjusting the impedance of the active circuit at the fundamental frequency. By properly tuning or "matching" the impedance of either the source or load, or both, of the active circuit at either the sub-harmonic or second harmonic frequency, or both, the amplitude and phase of the IM2 products can be adjusted such that the IM3 products resulting from the even-order nonlinearity approximately cancel the IM3 product(s) resulting from the odd-order nonlinearity.

公开(公告)号：NO20012706L

公开(公告)日：2001-07-31

申请号：NO20012706

申请日：2001-06-01

Applicant: QUALCOMM INC

Inventor： APARIN VLADIMIR ,  PERSICO CHARLES JAMES

IPC: H03H11/28 ,  H03F1/32

Abstract: Techniques to reduce intermodulation distortion at the output of an active circuit having even-order and odd-order nonlinearities. The IM3 products generated by the even-order nonlinearity of the active circuit are canceled against the IM3 products generated by the odd-order nonlinearity. The amplitude and phase of the IM3 products can be manipulated by adjusting either the source or load impedance, or both, of the active circuit. The amplitude and phase of the IM2 products generated by the even-order nonlinearity can be manipulated by adjusting the impedance of the active circuit at sub-harmonic and second harmonic frequencies (i.e., the frequencies of the IM2 products). The amplitude and phase of the IM3 products generated by the odd-order nonlinearity can be manipulated by adjusting the impedance of the active circuit at the fundamental frequency. By properly tuning or "matching" the impedance of either the source or load, or both, of the active circuit at either the sub-harmonic or second harmonic frequency, or both, the amplitude and phase of the IM2 products can be adjusted such that the IM3 products resulting from the even-order nonlinearity approximately cancel the IM3 product(s) resulting from the odd-order nonlinearity.

公开(公告)号：AU2726500A

公开(公告)日：2000-08-01

申请号：AU2726500

申请日：2000-01-13

Applicant: QUALCOMM INC

Inventor： APARIN VLADIMIR

IPC: H03H7/42 ,  H03F3/45 ,  H03H11/32

Abstract: Many applications require the conversion of a differential current signal into a single-ended signal. The shortcomings encountered with existing approaches include poor conversion efficiency, limited bandwidth, and large size. The converter disclosed uses active devices to obtain a unit of small size and high efficiency having a wide bandwidth of operation.

公开(公告)号：CA2289212A1

公开(公告)日：1998-11-26

申请号：CA2289212

申请日：1998-05-21

Applicant: QUALCOMM INC

Inventor： APARIN VLADIMIR

IPC: H03F3/45 ,  H03H11/22

Abstract: An active phase splitter (100, 102) comprises two or more phase shift circuits (110, 150). Each phase shift circuit comprises a number of active devices (112, 114, 152, 150) and capacitors (116, 156, 158). For a single-pole active phase splitter, within each phase shift circuit, two active devices are configured as a cascode amplifier. The first active device is configured as a common source amplifier and the second active device is configured as a common gate amplifier. A capacitor (116, 156) is connected across the gate and drain of the first active device to generate the necessary pole-zero pair for the phase shift circuit. The cascode configuration results in the desired transfer function and provides transconversion of voltage input (V1A) to current outputs (Ia, Ib). Active phase splitters with two or more poles can be built using the same inventive concept.

公开(公告)号：WO2014100511A3

公开(公告)日：2014-08-28

申请号：PCT/US2013076747

申请日：2013-12-19

Applicant: QUALCOMM INC

Inventor： APARIN VLADIMIR

IPC: H03G3/30

CPC classification number: H03G3/00 ,  H03G3/3078

Abstract: Techniques for simultaneously receiving multiple transmitted signals with independent gain control are disclosed. In an exemplary design, an apparatus (e.g., a wireless device, an integrated circuit, etc.) includes a low noise amplifier (LNA) and first and second receive circuits. The LNA amplifies a receiver input signal and provides (i) a first amplified signal for a first set of at least one transmitted signal being received and (ii) a second amplified signal for a second set of at least one transmitted signal being received. The first receive circuit scales the first amplified signal based on a first adjustable gain selected for the first set of transmitted signal(s). The second receive circuit scales the second amplified signal based on a second adjustable gain selected for the second set of transmitted signal(s). The first and second adjustable gains may be independently selected, e.g., based on the received powers of the transmitted signals.

Abstract translation: 公开了用于利用独立增益控制同时接收多个发送信号的技术。 在示例性设计中，装置（例如，无线设备，集成电路等）包括低噪声放大器（LNA）以及第一和第二接收电路。 LNA放大接收器输入信号并且提供（i）用于接收的第一组至少一个发射信号的第一放大信号和（ii）用于接收第二组至少一个发射信号的第二放大信号。 第一接收电路基于为第一组发射信号选择的第一可调增益来缩放第一放大信号。 第二接收电路基于为第二组发射信号选择的第二可调增益来缩放第二放大信号。 第一和第二可调整增益可以例如基于所发送信号的接收功率而被独立地选择。

公开(公告)号：WO2011139858A2

公开(公告)日：2011-11-10

申请号：PCT/US2011034395

申请日：2011-04-28

Applicant: QUALCOMM INC ,  APARIN VLADIMIR ,  GILMORE ROBERT P

Inventor： APARIN VLADIMIR ,  GILMORE ROBERT P

IPC: G06K9/00 ,  G06N3/00 ,  H03M1/12 ,  H03M7/30 ,  H03M13/00 ,  H04B1/04 ,  H04B7/005

CPC classification number: H03M7/30 ,  G06K9/00496 ,  H03F1/3258

Abstract: 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.

Abstract translation: 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。 凸度优化可用于确定最小化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。