Patents by Inventor Nadim Khlat

Nadim Khlat 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: 20190181803
    Abstract: An envelope tracking (ET) amplifier circuit is provided. In examples discussed herein, an amplifier circuit(s) is configured to amplify a radio frequency (RF) signal based on an ET modulated voltage. A tracker circuit is configured to generate the ET modulated voltage based on a number of target voltage amplitudes derived from a time-variant signal envelope of the RF signal. However, the tracker circuit can cause the ET modulated voltage to deviate from the target voltage amplitudes due to various impedance variations. In this regard, a voltage memory digital pre-distortion (mDPD) circuit digitally pre-distorts the target voltage amplitudes based on the time-variant signal envelope such that the ET modulated voltage can closely track the target voltage amplitudes. As such, it is possible to mitigate ET modulated voltage deviation, thus helping to improve overall linearity performance of the ET amplifier circuit.
    Type: Application
    Filed: March 29, 2018
    Publication date: June 13, 2019
    Inventors: Jean-Frederic Chiron, Nadim Khlat, Andrew F. Folkmann, Michael R. Kay
  • Publication number: 20190181804
    Abstract: A wide-bandwidth envelope tracking (ET) circuit is provided. In examples discussed herein, the wide-bandwidth ET circuit is configured to enable a differential amplifier circuit(s) to amplify a radio frequency (RF) signal(s) modulated at a wide-bandwidth (e.g., up to 160 MHz) without increasing power dissipation. Specifically, the wide-bandwidth ET circuit employs a pair of tracker circuits to concurrently provide ET modulated voltages and currents (e.g., direct current and/or alternating current) to the differential amplifier circuit(s) for amplifying the RF signal(s). For example, each of the tracker circuits can be configured to provide one-half (½) of the total current required by the differential amplifier circuit(s). Accordingly, the tracker circuits can be implemented with smaller output stages. As a result, the tracker circuits can supply the ET modulated voltages at a higher slew rate and reduced output impedance, thus helping to improve power dissipation in the wide-bandwidth ET circuit.
    Type: Application
    Filed: April 27, 2018
    Publication date: June 13, 2019
    Inventor: Nadim Khlat
  • Publication number: 20190172671
    Abstract: Microelectromechanical system (MEMS) switches that provide low contact resistance over a large number of open and close contact cycles are disclosed. A MEMS switch device may include a plurality of parallel MEMS switches with a first MEMS switch that is configured differently in such a manner to close first and/or open last during open and close cycles. In this regard, the first MEMS switch may experience increased contact resistance over a large number of open and close cycles while other MEMS switches maintain a low contact resistance. In certain embodiments, the first MEMS switch is controlled by a different control signal to open and close differently than the other MEMS switches. In certain embodiments, a common control signal controls a plurality of MEMS switches and the first MEMS switch is mechanically different such that it opens and closes differently than other MEMS switches.
    Type: Application
    Filed: October 30, 2018
    Publication date: June 6, 2019
    Inventors: Nadim Khlat, Jonathan Hale Hammond
  • Patent number: 10312960
    Abstract: A switchable RF transmit/receive (TX/RX) multiplexer, which includes a group of RF TX bandpass filters, a group of RF TX switching elements, and a group of RF RX bandpass filters; is disclosed. The group of RF TX bandpass filters includes a first RF TX bandpass filter and a second RF TX bandpass filter, such that each of the first RF TX bandpass filter and the second RF TX bandpass filter is coupled to a first filter connection node. The group of RF TX switching elements includes a first RF TX switching element coupled between the first filter connection node and a first common connection node, which is coupled to a first RF antenna. Each of the group of RF RX bandpass filters is coupled to the first common connection node.
    Type: Grant
    Filed: October 29, 2015
    Date of Patent: June 4, 2019
    Assignee: Qorvo US, Inc.
    Inventor: Nadim Khlat
  • Publication number: 20190158262
    Abstract: A tunable filter reduces the total number of filters used in TDD (Time-Division Duplex) communication circuitry. The communication circuitry may include a tunable filter and a first switch associated with the tunable filter. The tunable filter may include a tuning component and a filtering component. The tuning component may be located with the first switch on a first die. The filtering component may be located in a laminate underneath the first switch. Power amplifiers for amplifying transmission signals may be located on a second die, and the second die may be located on the laminate.
    Type: Application
    Filed: January 22, 2019
    Publication date: May 23, 2019
    Inventor: Nadim Khlat
  • Patent number: 10298288
    Abstract: This disclosure relates to antenna switching circuitry and other radio frequency (RF) front-end circuitry. In one embodiment, the antenna switching circuitry includes a multiple throw solid-state transistor switch (MTSTS), a multiple throw microelectromechanical switch (MTMEMS), and a control circuit. The MTSTS is configured to selectively couple a first pole port to any one of a first set of throw ports and to selectively couple a second pole port to any one of a second set of throw ports. The MTMEMS is configured to selectively couple a third pole port to any one of a third set of throw ports. The control circuit is configured to control the selective coupling of the MTSTS and the MTMEMS. In this manner, the control circuit may operate the antenna switching circuitry so that RF signals may be routed in accordance with Long Term Evolution (LTE) Multiple-Input and Multiple-Output (MIMO) and/or LTE diversity specifications.
    Type: Grant
    Filed: July 29, 2013
    Date of Patent: May 21, 2019
    Assignee: Qorvo US, Inc.
    Inventor: Nadim Khlat
  • Patent number: 10291205
    Abstract: RF circuitry, which includes a first acoustic RF resonator (ARFR) and a first compensating ARFR, is disclosed. A first inductive element is coupled between the first compensating ARFR and a first end of the first ARFR. A second inductive element is coupled between the first compensating ARFR and a second end of the first ARFR. The first compensating ARFR, the first inductive element, and the second inductive element at least partially compensate for a parallel capacitance of the first ARFR.
    Type: Grant
    Filed: December 23, 2015
    Date of Patent: May 14, 2019
    Assignee: Qorvo US, Inc.
    Inventors: Nadim Khlat, Jean-Frederic Chiron, Marcus Granger-Jones, Andrew F. Folkmann, Robert Aigner
  • Patent number: 10284174
    Abstract: Disclosed in one embodiment is filter circuitry having first and second paths extending between first and second nodes. The first path has a first inductor and a second inductor coupled in series between the first node and the second node, wherein the first inductor and the second inductor are positively coupled with one another, and a first common node is provided between the first inductor and the second inductor. First shunt acoustic resonators are coupled between the first common node and a fixed voltage node. The second path includes a third inductor and a fourth inductor coupled in series between the first node and the second node. The third inductor and the fourth inductor are negatively coupled with one another, and a second common node is provided between the third inductor and the fourth inductor. Second acoustic resonators are coupled between the second common node and a fixed voltage node.
    Type: Grant
    Filed: September 12, 2017
    Date of Patent: May 7, 2019
    Assignee: Qorvo US, Inc.
    Inventors: Nadim Khlat, Jean-Frederic Chiron
  • Patent number: 10284412
    Abstract: An envelope tracking (ET) amplifier circuit is provided. The voltage mDPD circuit is provided in an ET amplifier circuit and configured to determine a voltage deviation relative to an ET modulated target voltage signal, execute an mDPD polynomial in one or more iterations to extract an mDPD coefficient(s), and adjust a time-variant target voltage envelope of the ET modulated target voltage signal based on the mDPD coefficient(s) extracted in each of the mDPD iterations to reduce the voltage deviation to a predefined threshold. By reducing the voltage deviation in the ET modulated voltage, it is possible improve linearity (e.g., gain linearity) of the ET amplifier circuit, which can lead to reduced power consumption and improved radio frequency (RF) performance.
    Type: Grant
    Filed: October 25, 2017
    Date of Patent: May 7, 2019
    Assignee: Qorvo US, Inc.
    Inventors: Nadim Khlat, Jean-Frederic Chiron, Andrew F. Folkmann
  • Patent number: 10277260
    Abstract: A multi radio access technology (RAT) radio circuit is provided. The multi RAT radio circuit can support concurrent transmission of radio frequency (RF) transmit signals modulated based on a first RAT and a second RAT and concurrent reception of RF receive signals modulated based on the first RAT and the second RAT. The multi RAT radio circuit splits each RF transmit signal into an in-phase transmit signal and a quadrature transmit signal. The determined phase offset is so configured such that the multi RAT radio circuit can effectively suppress an IMD(s) located above and below a transmit band(s) of the RF transmit signals. By suppressing the IMD(s), it is possible to improve RF performance of the multi RAT radio circuit regardless of whether the RF transmit signals and the RF receive signals are communicated in a contiguous or non-contiguous RF spectrum.
    Type: Grant
    Filed: February 6, 2018
    Date of Patent: April 30, 2019
    Assignee: Qorvo US, Inc.
    Inventors: Nadim Khlat, Andrew F. Folkmann
  • Publication number: 20190115873
    Abstract: Embodiments of the disclosure relate to a multi-mode power management system supporting fifth-generation new radio (5G-NR). The multi-mode power management system includes first tracker circuitry and second tracker circuitry each capable of supplying an envelope tracking (ET) modulated or an average power tracking (APT) modulated voltage. In examples discussed herein, the first tracker circuitry and the second tracker circuitry have been configured to support third-generation (3G) and fourth-generation (4G) power amplifier circuits in various 3G/4G operation modes. The multi-mode power management system is adapted to further support a 5G-NR power amplifier circuit(s) in various 5G-NR operation modes based on the existing first tracker circuitry and/or the existing second tracker circuitry.
    Type: Application
    Filed: December 12, 2018
    Publication date: April 18, 2019
    Inventor: Nadim Khlat
  • Publication number: 20190109614
    Abstract: A multi-amplifier power management circuit and related apparatus are provided. The multi-amplifier power management circuit includes a transceiver circuit and an amplifier circuit, which are physically separated (e.g., in different integrated circuits). The amplifier circuit receives a radio frequency (RF) signal from the transceiver circuit and splits the RF signal into a number of RF transmit signals. The amplifier circuit includes a number of amplifiers configured to amplify the RF transmit signals. In examples discussed herein, the multi-amplifier power management circuit can be provided in an apparatus (e.g., a mobile communication device). The amplifier circuit may be collocated with a number of transmit antennas closer to an edge(s) of the apparatus. By collocating the amplifier circuit and the transmit antennas closer to the edge(s) of the apparatus, it may be possible to reduce RF signal radiation distance, thus helping to improve radiation efficiency and reduce heat dissipation in the apparatus.
    Type: Application
    Filed: May 21, 2018
    Publication date: April 11, 2019
    Inventor: Nadim Khlat
  • Publication number: 20190109613
    Abstract: An envelope tracking (ET) system is provided. The ET amplifies a radio frequency (RF) signal correspond to an amplitude bandwidth exceeding a voltage modulation bandwidth limitation of the ET system. The ET system compresses the amplitude bandwidth to match the voltage modulation bandwidth of the ET system. More specifically, the ET system compresses a predefined voltage waveform, which tracks time-variant amplitudes of a digital form of the RF signal, to generate a modified voltage waveform at a reduced bandwidth. To ensure that signal distortion(s) resulted from the bandwidth compression can be corrected, the ET system nonlinearly modifies predefined amplitude(s) of the predefined voltage waveform to generate modified amplitude(s) of the modified voltage waveform that is never less than the predefined amplitude(s) of the predefined voltage waveform. As such, the ET system can amplify the RF signal with improved linearity and efficiency, without degrading spectral performance of the RF signal.
    Type: Application
    Filed: February 5, 2018
    Publication date: April 11, 2019
    Inventors: Nadim Khlat, Andrew F. Folkmann
  • Publication number: 20190109566
    Abstract: Nonlinear bandwidth compression circuitry is provided. In examples discussed herein, nonlinear bandwidth compression circuitry can be configured to modify predefined amplitude(s) of a predefined voltage waveform to generate modified amplitude(s) of a modified voltage waveform that is never less than the predefined amplitude(s) of the predefined voltage waveform. Thus, by providing the nonlinear bandwidth compression circuitry in an envelope tracking (ET) system to perform bandwidth compression, signal distortion(s) resulted from the bandwidth compression can be corrected (e.g., via digital pre-distortion). As such, the ET system can amplify a radio frequency (RF) signal having a signal modulation bandwidth exceeding a voltage modulation bandwidth limitation of the ET system, without degrading spectral performance of the RF signal.
    Type: Application
    Filed: February 5, 2018
    Publication date: April 11, 2019
    Inventors: Andrew F. Folkmann, Nadim Khlat, James M. Retz
  • Patent number: 10256790
    Abstract: RF circuitry, which includes a first acoustic RF resonator (ARFR) and a first compensating ARFR, is disclosed. A first inductive element is coupled between the first compensating ARFR and a first end of the first ARFR. A second inductive element is coupled between the first compensating ARFR and a second end of the first ARFR. The first compensating ARFR, the first inductive element, and the second inductive element at least partially compensate for a parallel capacitance of the first ARFR.
    Type: Grant
    Filed: December 23, 2015
    Date of Patent: April 9, 2019
    Assignee: Qorvo US, Inc.
    Inventors: Nadim Khlat, Jean-Frederic Chiron, Marcus Granger-Jones, Andrew F. Folkmann, Robert Aigner
  • Patent number: 10250290
    Abstract: This disclosure relates generally to radio frequency (RF) front-end circuitry for different types of carrier aggregation, along with methods of operating the same. In one embodiment, the RF front-end circuitry includes a first diplexer, a second diplexer, first antenna selection circuitry, and second antenna selection circuitry. In order to maintain adequate isolation between high bands and low bands but provide carrier aggregation, the first antenna selection circuitry is configured to selectively couple each of a first plurality of RF ports to any one of a first low band port in the first diplexer and a second low band port in the second diplexer, while the second antenna selection circuitry is configured to selectively couple each of the second plurality of RF ports to any one of a first high band port in the first diplexer and a second high band port in the second diplexer.
    Type: Grant
    Filed: July 30, 2013
    Date of Patent: April 2, 2019
    Assignee: Qorvo US, Inc.
    Inventor: Nadim Khlat
  • Patent number: 10243537
    Abstract: Filter circuitry uses acoustic resonators to provide a frequency response having a stopband between two passbands. The filter circuitry includes at least one series acoustic resonator coupled between an input node and an output node. A compensation circuit is also coupled between the input node and the output node. The compensation circuit includes a first inductor and a second inductor coupled in series between the input node and the output node. The first inductor and the second inductor are negatively coupled with one another, wherein a common node is provided between the first inductor and the second inductor. A shunt circuit is coupled between the common node and a fixed voltage node. The shunt circuit includes a shunt inductor coupled in series with a plurality of parallel-coupled shunt acoustic resonators.
    Type: Grant
    Filed: November 9, 2016
    Date of Patent: March 26, 2019
    Assignee: Qorvo US, Inc.
    Inventor: Nadim Khlat
  • Publication number: 20190089310
    Abstract: An envelope tracking (ET) power management circuit is provided. The ET power management circuit includes an amplifier circuit(s) configured to output a radio frequency (RF) signal at a defined power level corresponding to a direct current, an alternating current, and an ET modulated voltage received by the amplifier circuit(s). The ET power management circuit can operate in a high-power ET mode when the defined power level exceeds a defined power level threshold and the RF signal is modulated to include no more than a defined number of resource blocks. The ET power management includes two ET tracker circuitries each generating a respective ET modulated voltage and two charge pump circuitries each generating a respective current. In the high-power ET mode, both charge pump circuitries are activated to each provide a reduced current to the amplifier circuit, thus helping to reduce a footprint and cost of the ET power management circuit.
    Type: Application
    Filed: March 29, 2018
    Publication date: March 21, 2019
    Inventors: Nadim Khlat, Michael R. Kay
  • Patent number: 10237050
    Abstract: A tunable filter reduces the total number of filters used in TDD (Time-Division Duplex) communication circuitry. The communication circuitry may include a tunable filter and a first switch associated with the tunable filter. The tunable filter may include a tuning component and a filtering component. The tuning component may be located with the first switch on a first die. The filtering component may be located in a laminate underneath the first switch. Power amplifiers for amplifying transmission signals may be located on a second die, and the second die may be located on the laminate.
    Type: Grant
    Filed: April 3, 2018
    Date of Patent: March 19, 2019
    Assignee: Qorvo US, Inc.
    Inventor: Nadim Khlat
  • Publication number: 20190081649
    Abstract: A multi radio access technology (RAT) radio circuit is provided. The multi RAT radio circuit can support concurrent transmission of radio frequency (RF) transmit signals modulated based on a first RAT and a second RAT and concurrent reception of RF receive signals modulated based on the first RAT and the second RAT. The multi RAT radio circuit splits each RF transmit signal into an in-phase transmit signal and a quadrature transmit signal. The determined phase offset is so configured such that the multi RAT radio circuit can effectively suppress an IMD(s) located above and below a transmit band(s) of the RF transmit signals. By suppressing the IMD(s), it is possible to improve RF performance of the multi RAT radio circuit regardless of whether the RF transmit signals and the RF receive signals are communicated in a contiguous or non-contiguous RF spectrum.
    Type: Application
    Filed: February 6, 2018
    Publication date: March 14, 2019
    Inventors: Nadim Khlat, Andrew F. Folkmann