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).
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Patent number: 11870396Abstract: 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: GrantFiled: November 9, 2021Date of Patent: January 9, 2024Assignee: SHENZHEN GOODIX TECHNOLOGY CO., LTD.Inventors: Ahmed Emira, Siavash Yazdi, Kaveh Moazzami
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Publication number: 20220069774Abstract: 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: ApplicationFiled: November 9, 2021Publication date: March 3, 2022Inventors: Ahmed Emira, Siavash Yazdi, Kaveh Moazzami
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Patent number: 11190141Abstract: 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: GrantFiled: June 30, 2020Date of Patent: November 30, 2021Assignee: SHENZHEN GOODIX TECHNOLOGY CO., LTD.Inventors: Ahmed Emira, Siavash Yazdi, Kaveh Moazzami
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Patent number: 11139738Abstract: 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: GrantFiled: January 6, 2020Date of Patent: October 5, 2021Assignee: SHENZHEN GOODIX TECHNOLOGY CO., LTD.Inventors: Esmail Babakrpur Nalousi, Siavash Yazdi, Ahmed Emira
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Patent number: 11075578Abstract: 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: GrantFiled: January 6, 2020Date of Patent: July 27, 2021Assignee: SHENZHEN GOODIX TECHNOLOGY CO., LTD.Inventors: Siavash Yazdi, Esmail Babakrpur Nalousi, Ahmed Emira
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Publication number: 20210211046Abstract: 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: ApplicationFiled: January 6, 2020Publication date: July 8, 2021Inventors: Siavash YAZDI, Esmail BABAKRPUR NALOUSI, Ahmed EMIRA
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Publication number: 20210211043Abstract: 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: ApplicationFiled: January 6, 2020Publication date: July 8, 2021Inventors: Esmail BABAKRPUR NALOUSI, Siavash YAZDI, Ahmed EMIRA
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Patent number: 10938296Abstract: 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: GrantFiled: February 14, 2020Date of Patent: March 2, 2021Assignee: SHENZHEN GOODIX TECHNOLOGY CO., LTD.Inventors: Siavash Yazdi, Ahmed Emira
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Publication number: 20200336112Abstract: 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: ApplicationFiled: June 30, 2020Publication date: October 22, 2020Inventors: Ahmed Emira, Siavash Yazdi, Kaveh Moazzami
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Patent number: 10763790Abstract: 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: GrantFiled: June 6, 2018Date of Patent: September 1, 2020Assignee: SHENZHEN GOODIX TECHNOLOGY CO., LTD.Inventors: Ahmed Emira, Siavash Yazdi, Kaveh Moazzami
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Publication number: 20200186023Abstract: 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: ApplicationFiled: February 14, 2020Publication date: June 11, 2020Inventors: Siavash Yazdi, Ahmed Emira
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Patent number: 10622891Abstract: 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: GrantFiled: May 6, 2019Date of Patent: April 14, 2020Assignee: SHENZHEN GOODIX TECHNOLOGY CO., LTD.Inventors: Siavash Yazdi, Faisal Hussien
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Patent number: 10608524Abstract: 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: GrantFiled: April 23, 2019Date of Patent: March 31, 2020Assignee: SHENZHEN GOODIX TECHNOLOGY CO., LTD.Inventors: Siavash Yazdi, Ahmed Emira
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Publication number: 20200083798Abstract: 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: ApplicationFiled: April 23, 2019Publication date: March 12, 2020Inventors: Siavash Yazdi, Ahmed Emira
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Publication number: 20190379333Abstract: 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: ApplicationFiled: June 6, 2018Publication date: December 12, 2019Inventors: Ahmed Emira, Siavash Yazdi, Kaveh Moazzami
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Publication number: 20190326815Abstract: 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: ApplicationFiled: May 6, 2019Publication date: October 24, 2019Inventors: Siavash Yazdi, Faisal Hussien
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Patent number: 10367417Abstract: 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: GrantFiled: April 19, 2018Date of Patent: July 30, 2019Assignee: SHENZHEN GOODIX TECHNOLOGY CO., LTD.Inventors: Siavash Yazdi, Faisal Hussien
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Patent number: 10333404Abstract: 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: GrantFiled: April 19, 2018Date of Patent: June 25, 2019Assignee: SHENZHEN GOODIX TECHNOLOGY CO., LTD.Inventors: Siavash Yazdi, Faisal Hussien
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Patent number: 10298114Abstract: 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: GrantFiled: September 8, 2018Date of Patent: May 21, 2019Assignee: SHENZHEN GOODIX TECHNOLOGY CO., LTD.Inventors: Siavash Yazdi, Ahmed Emira