公开(公告)号：US12028821B2

公开(公告)日：2024-07-02

申请号：US17478622

申请日：2021-09-17

Applicant: Samsung Electronics Co., Ltd.

Inventor： Tiangao Gou ,  Pranav Dayal ,  Niranjan Ratnakar ,  Gennady Feygin ,  Jungwon Lee

IPC: H04W56/00 ,  H03D3/00 ,  H04L27/36

CPC classification number: H04W56/004 ,  H03D3/009 ,  H04L27/364 ,  H03D2200/0045

Abstract: A method for providing IQ mismatch (IQMM) compensation includes: estimating an overall frequency response of a compensation filter by stepping through a frequency range starting at an initial frequency and performing (1) through (3) at each step, a selected frequency at each step being a multiple of a subcarrier frequency of the initial frequency: (1) sending a single tone signal at the selected frequency, (2) determining a first response of a mismatched signal at the selected frequency and a second response of the mismatched signal at an image frequency of the selected frequency, and (3) estimating a frequency response of the compensation filter at the selected frequency based on the first response and the second response; generating time-domain filter taps based on the estimated overall frequency response of the compensation filter; determining a time delay based on the time-domain filter taps; and generating a compensated signal based on the time delay.

公开(公告)号：US20180375711A1

公开(公告)日：2018-12-27

申请号：US15632093

申请日：2017-06-23

Applicant: Integrated Device Technology, Inc.

Inventor： CHUYING MAO ,  Ran LI ,  Jean-Marc MOURANT

IPC: H04L27/38 ,  H04B1/30 ,  H04L5/02 ,  H04L27/00 ,  H03D3/00 ,  H03D7/16 ,  H04L23/02 ,  H03C3/40

CPC classification number: H04L27/3863 ,  H03B27/00 ,  H03C3/40 ,  H03D3/009 ,  H03D7/165 ,  H04B1/30 ,  H04L5/02 ,  H04L23/02 ,  H04L27/0014 ,  H04L2027/0016 ,  H04L2027/0018

Abstract: Wide band quadrature signal generation includes a frequency synthesizer generating a LO or 2×LO signal, a polyphase filter coupled to receive the LO signal and generate first in-phase and quadrature LO signals, a 2:1 frequency divider coupled to receive the 2×LO signal and generate second in-phase and quadrature LO signals, and a LO signal selector for selecting either the first or second in-phase LO signals as an output in-phase LO signal and either the first or second quadrature LO signals as an output quadrature LO signal based on an output frequency. In some embodiments, when the output frequency is above a threshold, the first in-phase and quadrature LO signals are selected as the output in-phase and quadrature LO signals and when the output frequency is at or below the threshold, the second in-phase and quadrature LO signals are selected as the output in-phase and quadrature LO signals.

公开(公告)号：US09906384B1

公开(公告)日：2018-02-27

申请号：US15275968

申请日：2016-09-26

Applicant: NXP B.V.

Inventor： Robert Rutten ,  Lucien Johannes Breems ,  Johannes Hubertus Antonius Brekelmans ,  Jan Niehof ,  Muhammed Bolatkale ,  Shagun Bajoria

IPC: H04L25/03

CPC classification number: H04L25/03885 ,  H03D3/009 ,  H04L27/3863 ,  H04L2025/0349 ,  H04L2025/03808

Abstract: Corrections are provided for mismatches between an in-phase (I) signal and a quadrature-phase (Q) signal, the I and Q signals having a first frequency band. A frequency filter circuit filters the I and Q signals to produce a filtered I and Q output with a second frequency band that is a subset of the first frequency band. Digital circuitry includes a multiple-tap correction filter having a plurality of taps and configured to generate I and Q output signals by filtering the I and Q signals according to respective sets of coefficients for the plurality of taps. A coefficient estimator generates the sets of coefficients relative to different frequency bands.

公开(公告)号：US20170272109A1

公开(公告)日：2017-09-21

申请号：US15505444

申请日：2015-08-25

Applicant: Tensorcom, Inc.

Inventor： KhongMeng Tham ,  Huainan Ma ,  Zaw Soe ,  Ricky Lap Kei Cheung

IPC: H04B1/04 ,  H03D7/12

CPC classification number: H04B1/0475 ,  H03C2200/0058 ,  H03D3/008 ,  H03D3/009 ,  H03D7/125 ,  H03D7/165 ,  H04B1/04 ,  H04B1/0458 ,  H04B2001/0408

Abstract: Local oscillator (LO) leakage and Image are common and undesirable effects in typical transmitters. Typically, fairly complex hardware and algorithms are used to calibrate and reduce these impairments. A single transistor that draws essentially no dc current and occupies a very small area detects the LO leakage and Image signals. The single transistor operating as a square-law device is used to mix the signals at the input and output ports of a power amplifier. The mixed signal generated by the single transistor enables the simultaneous calibration of the LO leakage and Image Rejection.

公开(公告)号：US09660856B2

公开(公告)日：2017-05-23

申请号：US14806492

申请日：2015-07-22

Applicant: Linear Technology Corporation

Inventor： John Perry Myers

IPC: H04L25/03 ,  H04L27/36 ,  H03F1/32 ,  H04B3/32 ,  H03D3/00 ,  H03F3/45 ,  H04B1/10

CPC classification number: H04L27/364 ,  H03C2200/0083 ,  H03D3/009 ,  H03D2200/0088 ,  H03F1/3211 ,  H03F1/3247 ,  H03F3/4508 ,  H03F3/45475 ,  H04B1/1036 ,  H04B3/32 ,  H04L25/03343 ,  H04L27/368

Abstract: A method and system of compensating for distortion in a baseband in-phase (I) and a corresponding baseband quadrature (Q) signal. The circuit includes an in-phase I attenuator configured to attenuate the baseband in-phase I signal and an in-phase Q attenuator configured to attenuate the baseband Q signal. There are one or more circuits that are configured to receive the attenuated in-phase I signal and the attenuated baseband Q signal. Each circuit performs a different calculation based on predetermined equations configured to determine the IM2, HD2@0°, HD2@90°, IM3@0°, IM3@90°, HD3@0°, and HD3@90°. The distortion compensation circuit is configured to use the result of at least one of the calculation circuits to generate I and Q distortion compensation signals.

公开(公告)号：US20170093458A1

公开(公告)日：2017-03-30

申请号：US14864070

申请日：2015-09-24

Applicant: QUALCOMM Incorporated

Inventor： Hassan Rafique ,  Divaydeep Sikri

IPC: H04B1/68 ,  H04L27/36

CPC classification number: H04B1/68 ,  H03D3/009 ,  H04B1/30 ,  H04B10/5165 ,  H04B17/21 ,  H04B17/26 ,  H04L27/366 ,  H04L27/3863

Abstract: In some examples, a method and apparatus for wireless communication are disclosed. A wireless user equipment (UE) may receive an over-the-air tone pilot and apply the received pilot to a mixer. The mixer may mix the pilot with a local tone to generate a baseband signal. Here, the UE may determine an estimate of one or more parameters corresponding to a residual side band (RSB) in the baseband signal resulting from the mixer, and may accordingly apply the estimated one or more parameters to compensate for the RSB. The estimated RSB parameters may be refreshed online, by taking samples of the over-the-air tone pilot at a suitable refresh rate.

公开(公告)号：US09413294B2

公开(公告)日：2016-08-09

申请号：US14129629

申请日：2011-07-03

Applicant: Udi Suissa ,  Avi Cohen

Inventor： Udi Suissa ,  Avi Cohen

IPC: H04B1/38 ,  H04L5/16 ,  H03D3/00 ,  H04L27/00 ,  H04L27/36 ,  H04L27/38

CPC classification number: H03D3/009 ,  H04L27/0014 ,  H04L27/364 ,  H04L27/38

Abstract: The subject matter discloses an apparatus residing within an RF chip, comprising: a detection unit for detecting IQ mismatch in an IQ signal; an analog calibration module comprising a first analog calibration mechanism for calibrating IQ mismatch in the phase component and a second analog calibration mechanism for calibrating IQ mismatch in the amplitude component; and a control unit for determining a calibration sequence of the IQ signal.

Abstract translation: 主题公开了一种驻留在RF芯片内的装置，包括：用于检测IQ信号中的IQ失配的检测单元; 模拟校准模块，包括用于校准相位分量中的IQ失配的第一模拟校准机构和用于校准幅度分量中的IQ失配的第二模拟校准机构; 以及用于确定IQ信号的校准序列的控制单元。

公开(公告)号：US09379929B2

公开(公告)日：2016-06-28

申请号：US14220425

申请日：2014-03-20

Applicant: QUALCOMM Incorporated

Inventor： Cheng-Han Wang ,  I-Liang Lin ,  Liang Zhao ,  Hong Sun Kim ,  Yi Zeng

IPC: H04B1/10 ,  H04L27/34 ,  H04L27/36 ,  H03D3/00

CPC classification number: H04L27/3405 ,  H03C2200/0041 ,  H03D3/008 ,  H03D3/009 ,  H03D2200/0045 ,  H04L27/364

Abstract: A circuit for performing a residual side band calibration is described. The circuit generally includes a phase imbalance detection circuit. The phase imbalance detection circuit may include a limiter. The phase imbalance detection circuit may be independent of gain imbalance. The circuit may also include a phase imbalance correction circuit. The phase imbalance detection circuit may control coupling between an inphase path and a quadrature path.

Abstract translation: 描述用于执行残余边带校准的电路。 该电路通常包括相位不平衡检测电路。 相位不平衡检测电路可以包括限幅器。 相位不平衡检测电路可以与增益不平衡无关。 电路还可以包括相位不平衡校正电路。 相位不平衡检测电路可以控制同相路径和正交路径之间的耦合。

公开(公告)号：US09344270B2

公开(公告)日：2016-05-17

申请号：US13829232

申请日：2013-03-14

Applicant: QUALCOMM Incorporated

Inventor： Li Liu ,  Praveen-Kumar Sampath ,  Lai Kan Leung ,  Chiewcharn Narathong ,  Soon-Seng Lau ,  Ketan Humnabadkar ,  Raghu Narayan Challa ,  Devavrata Vasant Godbole

IPC: H03D3/24 ,  H04L27/20 ,  H04L7/033 ,  H03B21/01 ,  H04W52/02

CPC classification number: H04L7/0331 ,  H03B21/01 ,  H03D3/009 ,  H04W52/02 ,  H04W52/0209 ,  Y02D70/1222 ,  Y02D70/1262 ,  Y02D70/142 ,  Y02D70/144 ,  Y02D70/164

Abstract: Techniques for detecting and correcting phase discontinuity of a local oscillator (LO) signal are disclosed. In one design, a wireless device includes an LO generator and a phase detector. The LO generator generates an LO signal used for frequency conversion and is periodically powered on and off. The phase detector detects the phase of the LO signal when the LO generator is powered on. The detected phase of the LO signal is used to identify phase discontinuity of the LO signal. The wireless device may further include (i) a single-tone generator that generates a single-tone signal used to detect the phase of the LO signal, (ii) a downconverter that downconverts the single-tone signal with the LO signal and provides a downconverted signal used by the phase detector to detect the phase of LO signal, and (iii) phase corrector that corrects phase discontinuity of the LO signal in the analog domain or digital domain.

Abstract translation: 公开了用于检测和校正本地振荡器（LO）信号的相位不连续性的技术。 在一种设计中，无线设备包括LO发生器和相位检测器。 LO发生器产生用于频率转换的LO信号，并且周期性地通电和关断。 当LO发生器通电时，相位检测器检测LO信号的相位。 LO信号的检测相位用于识别LO信号的相位不连续性。 无线设备还可以包括（i）生成用于检测LO信号的相位的单音信号的单音发生器，（ii）下变频器，其使用LO信号对单音信号进行下变频，并提供 相位检测器用于检测LO信号的相位的下变频信号，以及（iii）校正模拟域或数字域中的LO信号的相位不连续性的相位校正器。

公开(公告)号：US09337965B2

公开(公告)日：2016-05-10

申请号：US14679987

申请日：2015-04-06

Applicant: Aviat U.S., Inc.

Inventor： Emerick Vann ,  Yen-Fang Chao ,  Youming Qin ,  Roland Matian

IPC: H04L1/20 ,  H04B1/16 ,  H03C3/40 ,  H03D3/00 ,  H03D7/16 ,  H04B1/30 ,  H04L27/38 ,  H04B1/00 ,  H04L1/00 ,  H04B1/28 ,  H04B1/10

CPC classification number: H04L1/206 ,  H03C3/406 ,  H03D3/009 ,  H03D7/168 ,  H04B1/0014 ,  H04B1/10 ,  H04B1/16 ,  H04B1/28 ,  H04B1/30 ,  H04L1/0036 ,  H04L1/203 ,  H04L1/208 ,  H04L27/38 ,  H04L27/3854

Abstract: Various embodiments provide for systems and methods for signal conversion of one modulated signal to another modulated signal using demodulation and then re-modulation. According to some embodiments, a signal receiving system may comprise an I/Q demodulator that demodulates a first modulated signal to an in-phase (“I”) signal and a quadrature (“Q”) signal, an I/Q signal adjustor that adaptively adjusts the Q signal to increase the signal-to-noise ratio (SNR) of a transitory signal that is based on a second modulated signal, and an I/Q modulator that modulates the I signal and the adjusted Q signal to the second modulated signal. To increase the SNR, the Q signal may be adjusted based on a calculated error determined for the transitory signal during demodulation by a demodulator downstream from the I/Q modulator.