Patents by Inventor Reza Alavi
Reza Alavi has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
-
Publication number: 20240106396Abstract: The present invention relates to a push-pull amplifying unit and a Doherty amplifier. The push-pull amplifying unit comprises a first amplifier, a second amplifier, a first shunt inductor, and a second shunt inductor. The first and second shunt inductors have mutually connected second terminals and are inductively coupled to increase the impedance between the first output and the virtual ground and the impedance between the second output and the virtual ground at a fundamental frequency of a signal to be amplified by the push-pull amplifying unit relative to those impedances in the absence of said inductive coupling, and to decrease the impedance between the first output and the virtual ground and the impedance between the second output and the virtual ground at a second harmonic frequency of the signal to be amplified relative to those impedances in the absence of said inductive coupling.Type: ApplicationFiled: February 4, 2022Publication date: March 28, 2024Inventors: Mohammad Reza BEIKMIRZA, Seyed Morteza ALAVI, Leonardus Cornelis Nicolaas DE VREEDE, Freerk VAN RIJS, Radjindrepersad GAJADHARSING
-
Patent number: 11539561Abstract: Apparatuses and methods related to digital mobile radio (DMR) with enhanced transceiver are disclosed herein. The transceiver detects waveforms of signals received by a digital mobile station radio (MS). By detecting whether the waveforms of the signals, the transceiver allows a digital baseband processor of the MS to remain in a sleep state while the signals are being detected by the DMR, thereby reducing an amount of power used while the signals are being detected.Type: GrantFiled: January 25, 2021Date of Patent: December 27, 2022Assignee: Analog Devices International Unlimited CompanyInventors: Jian Wang, Yong Wang, Haijiao Fan, Reza Alavi, Abdelaziz Chihoub, Esha John, Saeed Aghtar
-
Publication number: 20210176102Abstract: Apparatuses and methods related to digital mobile radio (DMR) with enhanced transceiver are disclosed herein. The transceiver detects waveforms of signals received by a digital mobile station radio (MS). By detecting whether the waveforms of the signals, the transceiver allows a digital baseband processor of the MS to remain in a sleep state while the signals are being detected by the DMR, thereby reducing an amount of power used while the signals are being detected.Type: ApplicationFiled: January 25, 2021Publication date: June 10, 2021Applicant: Analog Devices International Unlimited CompanyInventors: Jian WANG, Yong WANG, Haijiao FAN, Reza ALAVI, Abdelaziz CHIHOUB, Esha JOHN, Saeed AGHTAR
-
Patent number: 10904055Abstract: Apparatuses and methods related to digital mobile radio (DMR) with enhanced transceiver are disclosed herein. The transceiver detects waveforms of signals received by a digital mobile station radio (MS). By detecting whether the waveforms of the signals, the transceiver allows a digital baseband processor of the MS to remain in a sleep state while the signals are being detected by the DMR, thereby reducing an amount of power used while the signals are being detected.Type: GrantFiled: February 6, 2019Date of Patent: January 26, 2021Assignee: ANALOG DEVICES INTERNATIONAL UNLIMITED COMPANYInventors: Jian Wang, Yong Wang, Haijiao Fan, Reza Alavi, Abdelaziz Chihoub, Esha John, Saeed Aghtar
-
Publication number: 20200235966Abstract: Apparatuses and methods related to digital mobile radio (DMR) with enhanced transceiver are disclosed herein. The transceiver detects waveforms of signals received by a digital mobile station radio (MS). By detecting whether the waveforms of the signals, the transceiver allows a digital baseband processor of the MS to remain in a sleep state while the signals are being detected by the DMR, thereby reducing an amount of power used while the signals are being detected.Type: ApplicationFiled: February 6, 2019Publication date: July 23, 2020Applicant: Analog Devices International Unlimited CompanyInventors: Jian WANG, Yong WANG, Haijiao FAN, Reza Alavi, Abdelaziz CHIHOUB, Esha JOHN, Saeed AGHTAR
-
Patent number: 9859915Abstract: A wideband RF tuner with blocker signal detector for detection of blocking signals and for fast recovery from noise limited region.Type: GrantFiled: September 12, 2016Date of Patent: January 2, 2018Assignee: Analog Devices, Inc.Inventors: Reza Alavi, Shobhit Agrawal, Kenneth J Keyes, Jr.
-
Patent number: 9787415Abstract: 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.Type: GrantFiled: March 14, 2013Date of Patent: October 10, 2017Assignee: ANALOG DEVICES, INC.Inventors: Jianxun Fan, Reza Alavi, Steven R. Bal, David J. McLaurin
-
Patent number: 9762284Abstract: 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.Type: GrantFiled: April 6, 2016Date of Patent: September 12, 2017Assignee: Analog Devices, Inc.Inventors: Reza Alavi, Saeed Aghtar, Kenneth J. Keyes
-
Publication number: 20170077886Abstract: A wideband RF tuner with blocker signal detector for detection of blocking signals and for fast recovery from noise limited region.Type: ApplicationFiled: September 12, 2016Publication date: March 16, 2017Inventors: Reza Alavi, Shobhit Agrawal, Kenneth J. Keyes
-
Publication number: 20160294437Abstract: 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.Type: ApplicationFiled: April 6, 2016Publication date: October 6, 2016Inventors: Reza Alavi, Saeed Aghtar, Kenneth J. Keyes
-
Patent number: 8965317Abstract: Embodiments of the present invention may provide a signal processor with a wide gain range. The signal processor may comprise at least a discrete step gain stage and a continuous variable gain amplifier (VGA) stage. The discrete step gain stage may comprise a programmable gain amplifier (PGA) (e.g., low noise amplifiers 1 and 2 (LNA1 and LNA2)). The VGA stage may provide a continuous range to compensate the LNAs gain steps. In one embodiment, the AGC controller enables an inherent hysteresis with the AGC step change if required.Type: GrantFiled: April 26, 2011Date of Patent: February 24, 2015Assignee: Analog Devices, Inc.Inventors: Reza Alavi, Saeed Aghtar, Christoph Steinbrecher, Arathi Sundaresan
-
Publication number: 20140269863Abstract: 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.Type: ApplicationFiled: March 14, 2013Publication date: September 18, 2014Applicant: Analog Devices, Inc.Inventors: Jianxun Fan, Reza Alavi, Steven R. Bal, David J. McLaurin
-
Publication number: 20130050132Abstract: Techniques to control a capacitive touch screen that decrease processing time and increase noise rejection. The techniques may include injecting a plurality of excitation signals having unique spectral profiles onto conductors of the capacitive touch screen, sampling signals returned from the screen, and determining a location of touch. The techniques may further include injecting a plurality of excitation signals having unique spectral profiles onto adjacent or non-adjacent conductors of the capacitive touch screen. The techniques may further include injecting a plurality of excitation signals having unique spectral profiles onto conductors of the capacitive touch screen in unequal measures. The techniques may also include mapping frequency characteristics of noise present on the capacitive touch screen.Type: ApplicationFiled: August 26, 2011Publication date: February 28, 2013Applicant: ANALOG DEVICES, INC.Inventors: Javier Calpe Maravilla, Alberto Marinas, Santiago Iriarte, Enrique Company Bosch, Miguel Chanca, Reza Alavi, Vladimir Friedman, John Cleary
-
Publication number: 20120274398Abstract: Embodiments of the present invention may provide a signal processor with a wide gain range. The signal processor may comprise at least a discrete step gain stage and a continuous variable gain amplifier (VGA) stage. The discrete step gain stage may comprise a programmable gain amplifier (PGA) (e.g., low noise amplifiers 1 and 2 (LNA1 and LNA2)). The VGA stage may provide a continuous range to compensate the LNAs gain steps. In one embodiment, the AGC controller enables an inherent hysteresis with the AGC step change if required.Type: ApplicationFiled: April 26, 2011Publication date: November 1, 2012Applicant: ANALOG DEVICES, INC.Inventors: Reza ALAVI, Saeed AGHTAR, Christoph STEINBRECHER, Arathi SUNDARESAN
-
Patent number: 8286067Abstract: A method for delivering control information together with sampled data between a DSP and an RF/analog front-end in a high speed communication modem, which embeds sampled data and control information in frames to be transferred over one interface. A frame may comprise various fields, each may consist of one or more bytes or octets. The frame may have a data field for carrying the sampled data, and at least one control field for transferring the control information to update RF/analog front-end registers. The control field may include an octet containing a control address, an octet containing a control command, and an octet containing control data. The frame may also provide means of synchronization, e.g., by using a sync field to identify the frame boundary.Type: GrantFiled: October 19, 2009Date of Patent: October 9, 2012Assignee: Analog Devices, Inc.Inventors: Vladimir Friedman, Reza Alavi, Raju Hormis, Leo Montreuil
-
Publication number: 20100199158Abstract: A method for delivering control information together with sampled data between a DSP and an RF/analog front-end in a high speed communication modem, which embeds sampled data and control information in frames to be transferred over one interface. A frame may comprise various fields, each may consist of one or more bytes or octets. The frame may have a data field for carrying the sampled data, and at least one control field for transferring the control information to update RF/analog front-end registers. The control field may include an octet containing a control address, an octet containing a control command, and an octet containing control data. The frame may also provide means of synchronization, e.g., by using a sync field to identify the frame boundary.Type: ApplicationFiled: October 19, 2009Publication date: August 5, 2010Applicant: ANALOG DEVICES, INC.Inventors: Vladimir Friedman, Reza Alavi, Raju Hormis, Leo Montreuil
-
Patent number: 7050521Abstract: A method and system is provided for acquisition of the initial timing for a digital phase lock loop timing recovery system. A modified loop filter and post filter allows for an instantaneously change the oscillation frequency of a controllable oscillator and an instantaneous relative change of the sampling phase of the sampled data. These two features are used for initial timing recovery, in which the process of frequency and phase acquisition is separated into two independent steps. Once the initial timing is acquired, the timing recovery system is operated as a conventional digital phase lock loop timing recovery system to track additional frequency and phase drifts at the receiver with respect to the transmitter.Type: GrantFiled: May 13, 2002Date of Patent: May 23, 2006Assignee: Analog Devices, Inc.Inventor: Reza Alavi