公开(公告)号：US09859915B2

公开(公告)日：2018-01-02

申请号：US15263315

申请日：2016-09-12

Applicant: Analog Devices, Inc.

Inventor： Reza Alavi ,  Shobhit Agrawal ,  Kenneth J Keyes, Jr.

IPC: H03M3/00 ,  H03M1/12 ,  H04B7/00 ,  H04B1/10 ,  H03G3/30 ,  H03F3/189 ,  H03F1/52

CPC classification number: H03M3/462 ,  H03F1/52 ,  H03F3/189 ,  H03F2200/294 ,  H03F2200/426 ,  H03F2200/451 ,  H03G3/3052 ,  H03G3/3068 ,  H03J2200/17

Abstract: A wideband RF tuner with blocker signal detector for detection of blocking signals and for fast recovery from noise limited region.

公开(公告)号：US20230163798A1

公开(公告)日：2023-05-25

申请号：US18158328

申请日：2023-01-23

Applicant: Analog Devices, Inc.

Inventor： Reza Alavi ,  Adam Ruan ,  Yupeng Liu

IPC: H04B1/16 ,  H04B17/354 ,  H04B1/71

CPC classification number: H04B1/1676 ,  H04B17/354 ,  H04B1/7101

Abstract: The present disclosure provides a method and a system to estimate LO leakage and quadrature error parameters for a transmitter RF front end, such as a direct up-conversion transmitter RF front end, in a joint fashion. The proposed method utilizes a PN sequence inserted at the transmitter baseband. At the observation receiver side, an RX accumulator is implemented to sum receiver signals to take advantage of a despreading gain using the same PN sequence from transmitter side. Through the despreading process, the receiver-transmitter channel may be estimated and used to extract the quadrature error parameters. The estimated channel may also be used to eliminate user data interference presented within the RX accumulator output, which may further be used to compute the LO leakage.

公开(公告)号：US09787415B2

公开(公告)日：2017-10-10

申请号：US13826365

申请日：2013-03-14

Applicant: Analog Devices, Inc.

Inventor： Jianxun Fan ,  Reza Alavi ,  Steven R. Bal ,  David J. McLaurin

IPC: H04B17/11 ,  H04B1/52 ,  H04B15/04 ,  H04B1/525

CPC classification number: H04B17/11 ,  H04B1/525 ,  H04B15/04

Abstract: A method and apparatus for estimating and compensating TX LO leakage using circuitry on a loopback path connecting the transmitter and receiver are provided. The TX LO leakage may be estimated by measuring the DC signal on the receiver, measuring the phase difference between the received LO signal and the receiver LO signal, and filtering LO harmonics that may arise from the use of non-linear mixers. The DC signal on the receiver may be measured by opening and closing the loopback path, or changing the gain of the loopback path, or flipping the phase of looped back TX signal. The method may be used in an initialization or tracking calibration scheme.

公开(公告)号：US09762284B2

公开(公告)日：2017-09-12

申请号：US15092422

申请日：2016-04-06

Applicant: Analog Devices, Inc.

Inventor： Reza Alavi ,  Saeed Aghtar ,  Kenneth J. Keyes

IPC: H04L25/03 ,  H04B1/525 ,  H04B1/12 ,  H04B17/14

CPC classification number: H04B1/525 ,  H04B1/123 ,  H04B17/14

Abstract: A method of operating a radio frequency transceiver may include generating, by a transmit circuit of the transceiver, in-phase (I) and quadrature (Q) analog signals based on a digital calibration signal; mixing, by the transmit circuit, the I and Q analog signals with local oscillator (LO) and phase shifted LO signals to generate upconverted I and Q signals, the LO signal having a first frequency, and combining the upconverted I and Q signals to generate a combined signal; and converting, by a receive circuit of the transceiver, a signal based on the combined signal to a received digital signal using a sampling rate at a second frequency, the second frequency being less than the first frequency, wherein the converting downconverts frequency content in the combined signal.

公开(公告)号：US20160294437A1

公开(公告)日：2016-10-06

申请号：US15092422

申请日：2016-04-06

Applicant: Analog Devices, Inc.

Inventor： Reza Alavi ,  Saeed Aghtar ,  Kenneth J. Keyes

IPC: H04B1/525 ,  H04B1/00 ,  H04B1/04 ,  H04L7/00

CPC classification number: H04B1/525 ,  H04B1/123 ,  H04B17/14

Abstract: A method of operating a radio frequency transceiver may include generating, by a transmit circuit of the transceiver, in-phase (I) and quadrature (Q) analog signals based on a digital calibration signal; mixing, by the transmit circuit, the I and Q analog signals with local oscillator (LO) and phase shifted LO signals to generate upconverted I and Q signals, the LO signal having a first frequency, and combining the upconverted I and Q signals to generate a combined signal; and converting, by a receive circuit of the transceiver, a signal based on the combined signal to a received digital signal using a sampling rate at a second frequency, the second frequency being less than the first frequency, wherein the converting downconverts frequency content in the combined signal.

Abstract translation: 操作射频收发器的方法可以包括：基于数字校准信号，由收发器的发射电路产生同相（I）和正交（Q）模拟信号; 通过发送电路将本地振荡器（LO）和相移LO信号的I和Q模拟信号混合以产生上变频的I和Q信号，LO信号具有第一频率，并组合上变频的I和Q信号以产生 组合信号 以及通过所述收发器的接收电路，使用第二频率的采样率将基于所述组合信号的信号转换为接收到的数字信号，所述第二频率小于所述第一频率，其中所述转换将所述频率内容转换为 组合信号。