Patents by Inventor Siavash Yazdi

Siavash Yazdi 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: 20220069774
    Abstract: Techniques are described for using valley detection for supply voltage modulation in power amplifier circuits. Embodiments operate in context of a power amplifier circuit configured to be driven by a supply voltage generated by a supply modulator and to receive an amplitude-modulated (AM) signal at its input. The output of the power amplifier circuit can be fed to a valley detector that can detect a valley level corresponding to the bottom of the envelope of the AM signal. The detected valley level can be fed back to the supply modulator and compared to a constant reference. In response to the comparison, the supply modulator can vary the supply voltage to the power amplifier circuit in a manner that effectively tracking the envelope of the power amplifier circuit's output signal, thereby effectively seeking a flat valley for the output signal's envelope.
    Type: Application
    Filed: November 9, 2021
    Publication date: March 3, 2022
    Inventors: Ahmed Emira, Siavash Yazdi, Kaveh Moazzami
  • Patent number: 11190141
    Abstract: Techniques are described for using valley detection for supply voltage modulation in power amplifier circuits. Embodiments operate in context of a power amplifier circuit configured to be driven by a supply voltage generated by a supply modulator and to receive an amplitude-modulated (AM) signal at its input. The output of the power amplifier circuit can be fed to a valley detector that can detect a valley level corresponding to the bottom of the envelope of the AM signal. The detected valley level can be fed back to the supply modulator and compared to a constant reference. In response to the comparison, the supply modulator can vary the supply voltage to the power amplifier circuit in a manner that effectively tracking the envelope of the power amplifier circuit's output signal, thereby effectively seeking a flat valley for the output signal's envelope.
    Type: Grant
    Filed: June 30, 2020
    Date of Patent: November 30, 2021
    Assignee: SHENZHEN GOODIX TECHNOLOGY CO., LTD.
    Inventors: Ahmed Emira, Siavash Yazdi, Kaveh Moazzami
  • Patent number: 11139738
    Abstract: A converter circuit is disclosed. The converter circuit includes a controller configured to operate a pull up component and a pull down component so as to deliver power to a load through an inductor. The controller is configured to operate in either of first and second operational modes based on average current delivered to the load. The converter circuit also includes a mode control circuit configured to change operational modes in response to an indication of current flowing from the inductor to the switch node, and in response to an indication that the average current delivered to the load is greater than the current threshold.
    Type: Grant
    Filed: January 6, 2020
    Date of Patent: October 5, 2021
    Assignee: SHENZHEN GOODIX TECHNOLOGY CO., LTD.
    Inventors: Esmail Babakrpur Nalousi, Siavash Yazdi, Ahmed Emira
  • Patent number: 11075578
    Abstract: A converter circuit includes a pull up component, a pull down component, and a controller configured to operate the pull up component and the pull down component so as to deliver power to a load. The controller is configured to operate the pull up and pull down components in first and second operational modes, based on an average current delivered to the load. The converter circuit also includes a mode control circuit to generate a mode control signal based in part on a representation of a peak current received at the switch node from the pull up component.
    Type: Grant
    Filed: January 6, 2020
    Date of Patent: July 27, 2021
    Assignee: SHENZHEN GOODIX TECHNOLOGY CO., LTD.
    Inventors: Siavash Yazdi, Esmail Babakrpur Nalousi, Ahmed Emira
  • Publication number: 20210211046
    Abstract: A converter circuit includes a pull up component, a pull down component, and a controller configured to operate the pull up component and the pull down component so as to deliver power to a load. The controller is configured to operate the pull up and pull down components in first and second operational modes, based on an average current delivered to the load. The converter circuit also includes a mode control circuit to generate a mode control signal based in part on a representation of a peak current received at the switch node from the pull up component.
    Type: Application
    Filed: January 6, 2020
    Publication date: July 8, 2021
    Inventors: Siavash YAZDI, Esmail BABAKRPUR NALOUSI, Ahmed EMIRA
  • Publication number: 20210211043
    Abstract: A converter circuit is disclosed. The converter circuit includes a controller configured to operate a pull up component and a pull down component so as to deliver power to a load through an inductor. The controller is configured to operate in either of first and second operational modes based on average current delivered to the load.
    Type: Application
    Filed: January 6, 2020
    Publication date: July 8, 2021
    Inventors: Esmail BABAKRPUR NALOUSI, Siavash YAZDI, Ahmed EMIRA
  • Patent number: 10938296
    Abstract: Techniques are described for ripple detection and cancellation in switching voltage regulator circuits. For example, in a switching voltage converter, a voltage is up-converted or down-converted by switching high side and low side switches and passed through a low-pass filter for averaging. While the act of switching can result in conversion of the voltage with good efficiency, it also typically generates ripples on the output voltage, which can be undesirable in some applications. Embodiments use the switching voltage, the output voltage, and a feed-forward loop to generate a current cancellation signal to have particular gain, timing, and polarity that effectively emulates the complement of the inductor ripple current. The cancellation current signal can be injected into the output node, such that the cancellation current signal sums with the inductor ripple current at the output node, thereby at least partially cancelling the effect of the inductor ripple current.
    Type: Grant
    Filed: February 14, 2020
    Date of Patent: March 2, 2021
    Assignee: SHENZHEN GOODIX TECHNOLOGY CO., LTD.
    Inventors: Siavash Yazdi, Ahmed Emira
  • Publication number: 20200336112
    Abstract: Techniques are described for using valley detection for supply voltage modulation in power amplifier circuits. Embodiments operate in context of a power amplifier circuit configured to be driven by a supply voltage generated by a supply modulator and to receive an amplitude-modulated (AM) signal at its input. The output of the power amplifier circuit can be fed to a valley detector that can detect a valley level corresponding to the bottom of the envelope of the AM signal. The detected valley level can be fed back to the supply modulator and compared to a constant reference. In response to the comparison, the supply modulator can vary the supply voltage to the power amplifier circuit in a manner that effectively tracking the envelope of the power amplifier circuit's output signal, thereby effectively seeking a flat valley for the output signal's envelope.
    Type: Application
    Filed: June 30, 2020
    Publication date: October 22, 2020
    Inventors: Ahmed Emira, Siavash Yazdi, Kaveh Moazzami
  • Patent number: 10763790
    Abstract: Techniques are described for using valley detection for supply voltage modulation in power amplifier circuits. Embodiments operate in context of a power amplifier circuit configured to be driven by a supply voltage generated by a supply modulator and to receive an amplitude-modulated (AM) signal at its input. The output of the power amplifier circuit can be fed to a valley detector that can detect a valley level corresponding to the bottom of the envelope of the AM signal. The detected valley level can be fed back to the supply modulator and compared to a constant reference. In response to the comparison, the supply modulator can vary the supply voltage to the power amplifier circuit in a manner that effectively tracking the envelope of the power amplifier circuit's output signal, thereby effectively seeking a flat valley for the output signal's envelope.
    Type: Grant
    Filed: June 6, 2018
    Date of Patent: September 1, 2020
    Assignee: SHENZHEN GOODIX TECHNOLOGY CO., LTD.
    Inventors: Ahmed Emira, Siavash Yazdi, Kaveh Moazzami
  • Publication number: 20200186023
    Abstract: Techniques are described for ripple detection and cancellation in switching voltage regulator circuits. For example, in a switching voltage converter, a voltage is up-converted or down-converted by switching high side and low side switches and passed through a low-pass filter for averaging. While the act of switching can result in conversion of the voltage with good efficiency, it also typically generates ripples on the output voltage, which can be undesirable in some applications. Embodiments use the switching voltage, the output voltage, and a feed-forward loop to generate a current cancellation signal to have particular gain, timing, and polarity that effectively emulates the complement of the inductor ripple current. The cancellation current signal can be injected into the output node, such that the cancellation current signal sums with the inductor ripple current at the output node, thereby at least partially cancelling the effect of the inductor ripple current.
    Type: Application
    Filed: February 14, 2020
    Publication date: June 11, 2020
    Inventors: Siavash Yazdi, Ahmed Emira
  • Patent number: 10622891
    Abstract: A method for controlling a load-current zero-crossing of a switching regulator having a high-side switch and a low-side switch includes detecting, by a spike detection circuit, a presence of a spike on an output voltage of the switching regulator, determining, by the spike detection circuit, in the event that a spike is present, whether the spike is a positive spike or a negative spike, and adjusting a turn-off timing of the low-side switch based on a determination result.
    Type: Grant
    Filed: May 6, 2019
    Date of Patent: April 14, 2020
    Assignee: SHENZHEN GOODIX TECHNOLOGY CO., LTD.
    Inventors: Siavash Yazdi, Faisal Hussien
  • Patent number: 10608524
    Abstract: Techniques are described for ripple detection and cancellation in switching voltage regulator circuits. For example, in a switching voltage converter, a voltage is up-converted or down-converted by switching high side and low side switches and passed through a low-pass filter for averaging. While the act of switching can result in conversion of the voltage with good efficiency, it also typically generates ripples on the output voltage, which can be undesirable in some applications. Embodiments use the switching voltage, the output voltage, and a feed-forward loop to generate a current cancellation signal to have particular gain, timing, and polarity that effectively emulates the complement of the inductor ripple current. The cancellation current signal can be injected into the output node, such that the cancellation current signal sums with the inductor ripple current at the output node, thereby at least partially cancelling the effect of the inductor ripple current.
    Type: Grant
    Filed: April 23, 2019
    Date of Patent: March 31, 2020
    Assignee: SHENZHEN GOODIX TECHNOLOGY CO., LTD.
    Inventors: Siavash Yazdi, Ahmed Emira
  • Publication number: 20200083798
    Abstract: Techniques are described for ripple detection and cancellation in switching voltage regulator circuits. For example, in a switching voltage converter, a voltage is up-converted or down-converted by switching high side and low side switches and passed through a low-pass filter for averaging. While the act of switching can result in conversion of the voltage with good efficiency, it also typically generates ripples on the output voltage, which can be undesirable in some applications. Embodiments use the switching voltage, the output voltage, and a feed-forward loop to generate a current cancellation signal to have particular gain, timing, and polarity that effectively emulates the complement of the inductor ripple current. The cancellation current signal can be injected into the output node, such that the cancellation current signal sums with the inductor ripple current at the output node, thereby at least partially cancelling the effect of the inductor ripple current.
    Type: Application
    Filed: April 23, 2019
    Publication date: March 12, 2020
    Inventors: Siavash Yazdi, Ahmed Emira
  • Publication number: 20190379333
    Abstract: Techniques are described for using valley detection for supply voltage modulation in power amplifier circuits. Embodiments operate in context of a power amplifier circuit configured to be driven by a supply voltage generated by a supply modulator and to receive an amplitude-modulated (AM) signal at its input. The output of the power amplifier circuit can be fed to a valley detector that can detect a valley level corresponding to the bottom of the envelope of the AM signal. The detected valley level can be fed back to the supply modulator and compared to a constant reference. In response to the comparison, the supply modulator can vary the supply voltage to the power amplifier circuit in a manner that effectively tracking the envelope of the power amplifier circuit's output signal, thereby effectively seeking a flat valley for the output signal's envelope.
    Type: Application
    Filed: June 6, 2018
    Publication date: December 12, 2019
    Inventors: Ahmed Emira, Siavash Yazdi, Kaveh Moazzami
  • Publication number: 20190326815
    Abstract: A method for controlling a load-current zero-crossing of a switching regulator having a high-side switch and a low-side switch includes detecting, by a spike detection circuit, a presence of a spike on an output voltage of the switching regulator, determining, by the spike detection circuit, in the event that a spike is present, whether the spike is a positive spike or a negative spike, and adjusting a turn-off timing of the low-side switch based on a determination result.
    Type: Application
    Filed: May 6, 2019
    Publication date: October 24, 2019
    Inventors: Siavash Yazdi, Faisal Hussien
  • Patent number: 10367417
    Abstract: A control device for a switching voltage regulator having a high-side switch and a low-side switch to supply a switching voltage to a load includes a comparator configured to compare the switching voltage with a reference voltage to provide an enable signal to the low-side switch, and a spike detection circuit configured to receive the switching voltage and output an offset control signal to execute a time shift to the enable signal.
    Type: Grant
    Filed: April 19, 2018
    Date of Patent: July 30, 2019
    Assignee: SHENZHEN GOODIX TECHNOLOGY CO., LTD.
    Inventors: Siavash Yazdi, Faisal Hussien
  • Patent number: 10333404
    Abstract: A control device for a switching voltage regulator having a high-side switch and a low-side switch to supply a switching voltage to a load includes a comparator configured to compare the switching voltage with a reference voltage to provide an enable signal to the low-side switch, and a spike detection circuit configured to receive the switching voltage and output an offset control signal to execute a time shift to the enable signal.
    Type: Grant
    Filed: April 19, 2018
    Date of Patent: June 25, 2019
    Assignee: SHENZHEN GOODIX TECHNOLOGY CO., LTD.
    Inventors: Siavash Yazdi, Faisal Hussien
  • Patent number: 10298114
    Abstract: Techniques are described for ripple detection and cancellation in switching voltage regulator circuits. For example, in a switching voltage converter, a voltage is up-converted or down-converted by switching high side and low side switches and passed through a low-pass filter for averaging. While the act of switching can result in conversion of the voltage with good efficiency, it also typically generates ripples on the output voltage, which can be undesirable in some applications. Embodiments use the switching voltage, the output voltage, and a feed-forward loop to generate a current cancellation signal to have particular gain, timing, and polarity that effectively emulates the complement of the inductor ripple current. The cancellation current signal can be injected into the output node, such that the cancellation current signal sums with the inductor ripple current at the output node, thereby at least partially cancelling the effect of the inductor ripple current.
    Type: Grant
    Filed: September 8, 2018
    Date of Patent: May 21, 2019
    Assignee: SHENZHEN GOODIX TECHNOLOGY CO., LTD.
    Inventors: Siavash Yazdi, Ahmed Emira