Patents by Inventor Alireza Zolfaghari

Alireza Zolfaghari 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: 20210321521
    Abstract: Thermally induced graphene sensing circuitry and methods for producing circuits from such thermally induced circuits are presented in conjunction with applications to hydrocarbon exploration and production, and related subterranean activities. The thermally induced graphene circuity advantageously brings electrically interconnections otherwise absent on oilfield service tools, enabling components and tools to become smart.
    Type: Application
    Filed: April 8, 2020
    Publication date: October 14, 2021
    Inventors: Manuel Marya, Alireza Zolfaghari, Srinand Karuppoor
  • Patent number: 10435554
    Abstract: A degradable downhole component can include a thermoset composite material that includes a thermoset resin that includes crosslinks to a water-soluble polymer and fiber.
    Type: Grant
    Filed: September 19, 2017
    Date of Patent: October 8, 2019
    Assignee: SCHLUMBERGER TECHNOLOGY CORPORATION
    Inventors: Jushik Yun, Alireza Zolfaghari
  • Publication number: 20180079901
    Abstract: A degradable downhole component can include a thermoset composite material that includes a thermoset resin that includes crosslinks to a water-soluble polymer and fiber.
    Type: Application
    Filed: September 19, 2017
    Publication date: March 22, 2018
    Inventors: Jushik Yun, Alireza Zolfaghari
  • Patent number: 9140739
    Abstract: According to one disclosed embodiment, an on-chip resistor calibration circuit includes an RC oscillator having a test resistor and a precision capacitor as elements, a counter, and a reference clock. In one embodiment, an RC oscillator generates a waveform having a period dependent upon the resistance of the test resistor and the capacitance of the precision capacitor. In such an embodiment, a counter and a reference clock may be configured to measure the period of the waveform. Using a pre-determined capacitance of the precision capacitor, a resistance of the test resistor may be determined. In another embodiment, an RC oscillator generates first and second waveforms through use of an additional capacitor that can be switched in and out of the RC oscillator circuit. Using a pre-determined capacitance of the precision capacitor, an RC product of the test resistor and the additional capacitor may be determined.
    Type: Grant
    Filed: June 27, 2013
    Date of Patent: September 22, 2015
    Assignee: BROADCOM CORPORATION
    Inventors: Alireza Zolfaghari, Chin-Ming Chien, Bojko Marholev
  • Publication number: 20150092636
    Abstract: A system and method in a transceiver for reducing power. In transmission mode (Tx), a local oscillator (LO) generator (LOGEN) circuit modifies a PLL oscillation signal that runs at a fraction of the carrier signal. In the receive mode (Rx), the LOGEN circuit increases power consumption unnecessarily and is bypassed in favor of a PLL output which is a multiple of the carrier signal.
    Type: Application
    Filed: November 1, 2013
    Publication date: April 2, 2015
    Inventors: Ahmadreza Rofougaran, Maryam Rofougaran, Alireza Zolfaghari
  • Patent number: 8885690
    Abstract: Various embodiments are disclosed relating to power control techniques for wireless transmitters. In an example embodiment, an apparatus is provided that may include a digital-to-analog converter (DAC) adapted to convert a digital amplitude signal to an analog amplitude signal during a first transmission mode and adapted to convert a digital power level signal to an analog power level signal during a second transmission mode.
    Type: Grant
    Filed: May 20, 2013
    Date of Patent: November 11, 2014
    Assignee: Broadcom Corporation
    Inventors: Alireza Zolfaghari, Henrik Tholstrup Jensen, Hooman Darabi
  • Patent number: 8736322
    Abstract: A mobile communication device is provided that has a transceiver including a voltage controlled oscillator (VCO) and a calibration circuit for calibrating the VCO. The calibration circuit includes a logic block configured to estimate a calibration value for a tuning of the VCO to a desired frequency, and an asynchronous counter configured to execute a counting sequence to identify a frequency of the VCO after the tuning of the VCO using the calibration value, where the calibration circuit is configured to determine a tuned calibration value for producing the desired frequency from the counting sequence.
    Type: Grant
    Filed: November 16, 2011
    Date of Patent: May 27, 2014
    Assignee: Broadcom Corporation
    Inventors: Koji Kimura, Alireza Zolfaghari
  • Publication number: 20130285679
    Abstract: According to one disclosed embodiment, an on-chip resistor calibration circuit includes an RC oscillator having a test resistor and a precision capacitor as elements, a counter, and a reference clock. In one embodiment, an RC oscillator generates a waveform having a period dependent upon the resistance of the test resistor and the capacitance of the precision capacitor. In such an embodiment, a counter and a reference clock may be configured to measure the period of the waveform. Using a pre-determined capacitance of the precision capacitor, a resistance of the test resistor may be determined. In another embodiment, an RC oscillator generates first and second waveforms through use of an additional capacitor that can be switched in and out of the RC oscillator circuit. Using a pre-determined capacitance of the precision capacitor, an RC product of the test resistor and the additional capacitor may be determined.
    Type: Application
    Filed: June 27, 2013
    Publication date: October 31, 2013
    Inventors: Alireza Zolfaghari, Chin-Ming Chien, Bojko Marholev
  • Publication number: 20130252564
    Abstract: Various embodiments are disclosed relating to power control techniques for wireless transmitters. In an example embodiment, an apparatus is provided that may include a digital-to-analog converter (DAC) adapted to convert a digital amplitude signal to an analog amplitude signal during a first transmission mode and adapted to convert a digital power level signal to an analog power level signal during a second transmission mode.
    Type: Application
    Filed: May 20, 2013
    Publication date: September 26, 2013
    Inventors: Alireza Zolfaghari, Henrik Tholstrup Jensen, Hooman Darabi
  • Patent number: 8476911
    Abstract: According to one disclosed embodiment, an on-chip resistor calibration circuit includes an RC oscillator having a test resistor and a precision capacitor as elements, a counter, and a reference clock. In one embodiment, an RC oscillator generates a waveform having a period dependent upon the resistance of the test resistor and the capacitance of the precision capacitor. In such an embodiment, a counter and a reference clock may be configured to measure the period of the waveform. Using a pre-determined capacitance of the precision capacitor, a resistance of the test resistor may be determined. In another embodiment, an RC oscillator generates first and second waveforms through use of an additional capacitor that can be switched in and out of the RC oscillator circuit. Using a pre-determined capacitance of the precision capacitor, an RC product of the test resistor and the additional capacitor may be determined.
    Type: Grant
    Filed: November 10, 2010
    Date of Patent: July 2, 2013
    Assignee: Broadcom Corporation
    Inventors: Alireza Zolfaghari, Chin-Ming Chien, Bojko Marholev
  • Patent number: 8467473
    Abstract: Various embodiments are disclosed relating to power control techniques for wireless transmitters. In an example embodiment, an apparatus is provided that may include a digital-to-analog converter (DAC) adapted to convert a digital amplitude signal to an analog amplitude signal during a first transmission mode and adapted to convert a digital power level signal to an analog power level signal during a second transmission mode.
    Type: Grant
    Filed: March 31, 2006
    Date of Patent: June 18, 2013
    Assignee: Broadcom Corporation
    Inventors: Alireza Zolfaghari, Henrik Tholstrup Jensen, Hooman Darabi
  • Publication number: 20130120034
    Abstract: A mobile communication device is provided that has a transceiver including a voltage controlled oscillator (VCO) and a calibration circuit for calibrating the VCO. The calibration circuit includes a logic block configured to estimate a calibration value for a tuning of the VCO to a desired frequency, and an asynchronous counter configured to execute a counting sequence to identify a frequency of the VCO after the tuning of the VCO using the calibration value, where the calibration circuit is configured to determine a tuned calibration value for producing the desired frequency from the counting sequence.
    Type: Application
    Filed: November 16, 2011
    Publication date: May 16, 2013
    Applicant: BROADCOM CORPORATION
    Inventors: Koji Kimura, Alireza Zolfaghari
  • Patent number: 8406692
    Abstract: Various embodiments are disclosed relating to wireless systems, and also relating to transmitter amplifiers, such as, for example, polar transmitter amplifiers with variable output power. According to an example embodiment, a circuit is provided including a plurality of selectable amplifier cells. Each amplifier cell may receive a phase or frequency modulated signal and an amplitude modulated signal. Each amplifier cell may output a signal based upon a combination of the received amplitude modulated signal and the received phase or frequency modulated signal if the amplifier cell is selected. The circuit may provide a variable output current or output power based upon the selection of one or more of the amplifier cells.
    Type: Grant
    Filed: September 13, 2010
    Date of Patent: March 26, 2013
    Assignee: Broadcom Corporation
    Inventor: Alireza Zolfaghari
  • Patent number: 8280322
    Abstract: A phase locked loop (PLL) a phase detector, a charge pump, a loop filter, a controlled oscillator, and a feedback divider. The phase detector is coupled to produce a difference signal based on a difference between phase of a reference oscillation and phase of a feedback oscillation. The charge pump is coupled to convert the difference signal into an up-signal or a down signal. The loop filter coupled to filter the up signal or the down signal to produce a control signal. The controlled oscillator is coupled to generate an output oscillation based on the control signal. The feedback divider is coupled to generate the feedback oscillation from the output oscillation based on a divider value. The loop filter includes a first resistor-capacitor circuit and a second resistor-capacitor circuit. The first resistor-capacitor circuit is calibrated using a first calibration technique and the second resistor-capacitor circuit is calibrated using a second calibration technique.
    Type: Grant
    Filed: February 8, 2010
    Date of Patent: October 2, 2012
    Assignee: Broadcom Corporation
    Inventors: Alireza Zolfaghari, Hooman Darabi
  • Patent number: 8280325
    Abstract: According to an example embodiment, an apparatus may be provided that is configurable to operate in either a separate power amplifier configuration or a combined power amplifier configuration.
    Type: Grant
    Filed: February 27, 2009
    Date of Patent: October 2, 2012
    Assignee: Broadcom Corporation
    Inventor: Alireza Zolfaghari
  • Patent number: 8275332
    Abstract: An apparatus comprising a plurality of switchable full step mixer unit cells, wherein each switchable full step unit cell is configured to, when the full step transceiver mixer unit cell is turned on, increase the gain experienced by an electronic signal by a full step increment, and wherein the step increment is substantially constant regardless of temperature; and at least one switchable partial step mixer unit cell configured to, when the partial step transceiver mixer unit is turned on, increase the gain experienced by the electronic signal by a predetermined step increment less than that of a full step, and wherein the partial step increment is substantially constant regardless of temperature.
    Type: Grant
    Filed: November 22, 2011
    Date of Patent: September 25, 2012
    Assignee: Broadcom Corporation
    Inventors: Ahmad Mirzaei, Alireza Zolfaghari, Hooman Darabi
  • Patent number: 8194785
    Abstract: In an envelope comparison embodiment, a delay calibrator produces a delay signal based on a comparison of a feedback signal and an envelope component of the transmitted signal. A down-converter produces the feedback signal from an outgoing modulated RF signal based on at least one local oscillation. Envelope detectors in the delay calibrator and the envelope signal path are operably coupled to a summing node that produces a delay error signal based on a temporal difference between the two envelopes. One embodiment includes phase detectors to detect and adjust the zero crossings of the feedback signal and the envelope signal path. As the delay mismatch between the envelope signal path and the phase signal path increases, the power spectrum increases in adjacent communication channels. A mask margin measurement technique measures the power level in an adjacent channel and adjusts the envelope path delay accordingly.
    Type: Grant
    Filed: January 19, 2009
    Date of Patent: June 5, 2012
    Assignee: Broadcom Corporation
    Inventors: Alireza Zolfaghari, Henrik T. Jensen, Ahmadreza (Reza) Rofougaran
  • Patent number: 8183932
    Abstract: Aspects of a method and system for processing signals via an integrated low noise amplifier having a configurable input signaling mode are provided. In this regard, one or more circuits comprising an integrated amplifier may be configurable such that, in a first configuration, the one or more circuits are operable to handle a differential input signal, and, in a second mode of operation, the one or more circuits are operable to handle a single-ended input signal. The one or more circuits may output a differential signal when handling a differential input signal and when handling a single-ended input signal. In some instances, whether the one or more circuits are operable to handle a differential input signal or a single-ended input signal may determined by an inductance of a bond wire coupling the integrated amplifier to an integrated circuit package.
    Type: Grant
    Filed: March 5, 2010
    Date of Patent: May 22, 2012
    Assignee: Broadcom Corporation
    Inventor: Alireza Zolfaghari
  • Publication number: 20120112773
    Abstract: According to one disclosed embodiment, an on-chip resistor calibration circuit includes an RC oscillator having a test resistor and a precision capacitor as elements, a counter, and a reference clock. In one embodiment, an RC oscillator generates a waveform having a period dependent upon the resistance of the test resistor and the capacitance of the precision capacitor. In such an embodiment, a counter and a reference clock may be configured to measure the period of the waveform. Using a pre-determined capacitance of the precision capacitor, a resistance of the test resistor may be determined. In another embodiment, an RC oscillator generates first and second waveforms through use of an additional capacitor that can be switched in and out of the RC oscillator circuit. Using a pre-determined capacitance of the precision capacitor, an RC product of the test resistor and the additional capacitor may be determined.
    Type: Application
    Filed: November 10, 2010
    Publication date: May 10, 2012
    Applicant: Broadcom Corporation
    Inventors: Alireza Zolfaghari, Chin-Ming Chien, Bojko Marholev
  • Patent number: 8145146
    Abstract: A radio frequency (RF) transmitter front-end includes a digital to analog conversion module and a power amplifier module. The digital to analog conversion module is coupled to convert amplitude information into analog amplitude adjust signals when a first mode is active and is coupled to convert power level information into analog power level signals when a second mode is active. The power amplifier module is coupled to amplify first phase modulated RF signals in accordance with the analog amplitude adjust signals to produce first outbound RF signals when the first mode is active and is coupled to amplify second phase modulated RF signals in accordance with the analog power level signals to produce second outbound RF signals when the second mode is active.
    Type: Grant
    Filed: May 28, 2010
    Date of Patent: March 27, 2012
    Assignee: Broadcom Corporation
    Inventors: Mohammad Nariman, Alireza Zolfaghari, Hooman Darabi