Patents by Inventor Erhan Ozalevli
Erhan Ozalevli 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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Publication number: 20200007145Abstract: An example device comprises a digital-to-analog converter (DAC) comprising first and second transistors coupled to a first amplifier, the second transistor coupled to a first output of the DAC and to an output of the first amplifier, and third and fourth transistors coupled to the first amplifier and to a second output of the DAC, the third and fourth transistors switchably coupled to a voltage supply and to the first transistor. The device also comprises a first node coupled to the first output of the DAC and to a resistor. The device further includes a second node coupled to the second output of the DAC, and a second amplifier coupled to the second node and to the first transistor and switchably coupled to the third and fourth transistors. The device also comprises a comparator coupled to the first node.Type: ApplicationFiled: November 14, 2018Publication date: January 2, 2020Inventors: Mustapha EL MARKHI, Erhan OZALEVLI, Tuli DAKE, Rohit BHAN
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Publication number: 20190386575Abstract: A wireless power transfer system using a resonant rectifier circuit with capacitor sensing. A wireless power transfer system includes a power receiver resonant circuit and a synchronous rectifier. The power receiver resonant circuit includes an inductor and a capacitor connected in series with the inductor. The synchronous rectifier is configured to identify zero crossings of alternating current flowing through the inductor based on voltage across the capacitor, and control synchronous rectification of the alternating current based on timing of the zero crossings.Type: ApplicationFiled: August 28, 2019Publication date: December 19, 2019Inventors: Mustapha El Markhi, Erhan Ozalevli, Tuli Dake, Dingkun Du, Gianpaolo Lisi, Jingwei Xu
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Patent number: 10512130Abstract: LED backlight circuits for a display and methods for operating the circuits are disclosed. The LED backlight circuit includes a set of drivers and a set of LED strings. A driver can be capable of coupling to any of the LED strings at a given time. Examples of the disclosure can include different configurations of drivers. In some instances, the driver may include an auxiliary transistor that allows the driver to settle before being switched to control a respective LED string. In some examples, the driver can include switches and an idle transistor that can be operated such that a low current path through the driver can exist when the driver is not coupled to a LED string.Type: GrantFiled: February 1, 2019Date of Patent: December 17, 2019Assignee: Apple Inc.Inventors: Erhan Ozalevli, Behzad Mohtashemi
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Patent number: 10469073Abstract: Aspects of the present disclosure provide for a circuit, comprising a first node configured to couple to a first current source and a second current source. The circuit also comprises a first filter configured to couple between a voltage supply and the first node, the first filter being a first dynamically controllable current filter. The circuit further comprises a current mirror coupled between the first node and a second node configured to couple to a third current source and a fourth current source. The circuit additionally comprises a second filter configured to couple between the second node and a ground node, the second filter being a second dynamically controllable current filter.Type: GrantFiled: July 27, 2018Date of Patent: November 5, 2019Assignee: Texas Instruments IncorporatedInventors: Erhan Ozalevli, Mustapha El Markhi, Rohit Bhan
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Patent number: 10439502Abstract: A wireless power transfer system using a resonant rectifier circuit with capacitor sensing. A wireless power transfer system includes a power receiver resonant circuit and a synchronous rectifier. The power receiver resonant circuit includes an inductor and a capacitor connected in series with the inductor. The synchronous rectifier is configured to identify zero crossings of alternating current flowing through the inductor based on voltage across the capacitor, and control synchronous rectification of the alternating current based on timing of the zero crossings.Type: GrantFiled: September 28, 2016Date of Patent: October 8, 2019Assignee: Texas Instruments IncorporatedInventors: Mustapha El Markhi, Erhan Ozalevli, Tuli Dake, Dingkun Du, Gianpaolo Lisi, Jingwei Xu
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Publication number: 20190131863Abstract: In a described example, an apparatus includes: transistor having a first terminal coupled to an input terminal, a second terminal coupled to an output terminal, and a gate terminal; a temperature sensor configured to sense a junction temperature of the transistor and generate a temperature signal based on the sensed junction temperature; and a gate driver circuit configured to generate a gate signal based on the temperature signal and to output the gate signal to the gate terminal of the transistor.Type: ApplicationFiled: November 1, 2017Publication date: May 2, 2019Inventors: Mustapha El Markhi, Erhan Ozalevli, Tuli Dake
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Publication number: 20190109596Abstract: One example includes a phase-locked loop (PLL) circuit. The circuit includes a frequency divider and phase detector configured to generate a plurality of non-overlapping switching signals based on an input signal and a PLL output signal. The circuit also includes a linear frequency-to-current (F2I) converter configured to generate a control current having an amplitude that is based on the plurality of non-overlapping switching signals. The circuit further includes a linear current-controlled oscillator configured to generate the PLL output signal to have a frequency and phase to be approximately equal to the input signal based on the amplitude of the control current.Type: ApplicationFiled: December 11, 2018Publication date: April 11, 2019Inventors: ERHAN OZALEVLI, MUSTAPHA EL MARKHI, TULI DAKE
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Patent number: 10200048Abstract: One example includes a phase-locked loop (PLL) circuit. The circuit includes a frequency divider and phase detector configured to generate a plurality of non-overlapping switching signals based on an input signal and a PLL output signal. The circuit also includes a linear frequency-to-current (F2I) converter configured to generate a control current having an amplitude that is based on the plurality of non-overlapping switching signals. The circuit further includes a linear current-controlled oscillator configured to generate the PLL output signal to have a frequency and phase to be approximately equal to the input signal based on the amplitude of the control current.Type: GrantFiled: November 8, 2016Date of Patent: February 5, 2019Assignee: TEXAS INSTRUMENTS INCORPORATEDInventors: Erhan Ozalevli, Mustapha El Markhi, Tuli Dake
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Publication number: 20180131377Abstract: One example includes a phase-locked loop (PLL) circuit. The circuit includes a frequency divider and phase detector configured to generate a plurality of non-overlapping switching signals based on an input signal and a PLL output signal. The circuit also includes a linear frequency-to-current (F2I) converter configured to generate a control current having an amplitude that is based on the plurality of non-overlapping switching signals. The circuit further includes a linear current-controlled oscillator configured to generate the PLL output signal to have a frequency and phase to be approximately equal to the input signal based on the amplitude of the control current.Type: ApplicationFiled: November 8, 2016Publication date: May 10, 2018Inventors: ERHAN OZALEVLI, MUSTAPHA EL MARKHI, TULI DAKE
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Publication number: 20180090993Abstract: A wireless power transfer system using a resonant rectifier circuit with capacitor sensing. A wireless power transfer system includes a power receiver resonant circuit and a synchronous rectifier. The power receiver resonant circuit includes an inductor and a capacitor connected in series with the inductor. The synchronous rectifier is configured to identify zero crossings of alternating current flowing through the inductor based on voltage across the capacitor, and control synchronous rectification of the alternating current based on timing of the zero crossings.Type: ApplicationFiled: September 28, 2016Publication date: March 29, 2018Applicant: TEXAS INSTRUMENTS INCORPORATEDInventors: Mustapha El MARKHI, Erhan OZALEVLI, Tuli DAKE, Dingkun DU, Gianpaolo LISI, Jingwei XU
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Patent number: 9292038Abstract: A synchronization circuit receives an external clock input. The circuit includes an internal oscillator; a clock detection circuit, coupled to the external clock input, for determining whether a clock signal at the external clock input is valid; circuitry for keeping the frequency of the internal oscillator constant until the clock detection circuit determines that an external clock signal is valid; and circuitry for switching the output of the synchronization circuit from the internal oscillator to the external clock input when the clock detection circuit determines than an external clock signal is valid.Type: GrantFiled: November 3, 2014Date of Patent: March 22, 2016Assignee: TEXAS INSTRUMENTS INCORPORATEDInventor: Erhan Ozalevli
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Patent number: 9083252Abstract: A DC-DC converter includes a primary side sense circuit to detect a load current of the DC-DC converter based on reflected current from a secondary winding of the DC-DC converter to a primary winding of the DC-DC converter. A primary side diode models effects of a secondary side diode that is driven from the secondary winding of the DC-DC converter. An output correction circuit controls a switching waveform to the primary winding of the DC-DC converter based on feedback from the primary side sense circuit and the primary side diode.Type: GrantFiled: October 23, 2012Date of Patent: July 14, 2015Assignee: TEXAS INSTRUMENTS INCORPORATEDInventors: Erhan Ozalevli, David Daniels, Luthuli E. Dake
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Publication number: 20140112023Abstract: A DC-DC converter includes a primary side sense circuit to detect a load current of the DC-DC converter based on reflected current from a secondary winding of the DC-DC converter to a primary winding of the DC-DC converter. A primary side diode models effects of a secondary side diode that is driven from the secondary winding of the DC-DC converter. An output correction circuit controls a switching waveform to the primary winding of the DC-DC converter based on feedback from the primary side sense circuit and the primary side diode.Type: ApplicationFiled: October 23, 2012Publication date: April 24, 2014Applicant: TEXAS INSTRUMENTS INCORPORATEDInventors: ERHAN OZALEVLI, DAVID DANIELS, LUTHULI E. DAKE
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Patent number: 8044646Abstract: Various apparatuses, methods and systems for a voltage regulator are disclosed herein. For example, some embodiments provide an apparatus for regulating a voltage including an N-channel transistor that is connected between an input and an output, an error amplifier that is connected to the output, a capacitor that is connected between the error amplifier and a gate of the N-channel transistor, and a comparator that is connected to a node between the error amplifier and the capacitor. The apparatus also includes a charge pump that is switchably connected to the gate of the N-channel transistor. The apparatus is adapted to connect the charge pump to the gate of the N-channel transistor when a voltage at the node between the error amplifier and the capacitor rises above a threshold voltage.Type: GrantFiled: April 10, 2009Date of Patent: October 25, 2011Assignee: Texas Instruments IncorporatedInventors: Erhan Ozalevli, Luthuli E. Dake, Gregory Romas, Ching-yuh Tsay
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Patent number: 7843246Abstract: In accordance with an aspect of the present invention, an external FET driving circuit includes a driving portion, a drain-to-gate clamp portion and a current feedback portion. The driving portion provides a driving signal to the external FET. The drain-to-gate clamp portion protects the external FET from flyback current, when the external FET is quickly turned OFF. The current feedback portion controls the driving signal provided by the driver.Type: GrantFiled: November 12, 2008Date of Patent: November 30, 2010Assignee: Texas Instruments IncorporatedInventors: Erhan Ozalevli, Luthuli Dake, Rashed Anam
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Publication number: 20100259235Abstract: Various apparatuses, methods and systems for a voltage regulator are disclosed herein. For example, some embodiments provide an apparatus for regulating a voltage including an N-channel transistor that is connected between an input and an output, an error amplifier that is connected to the output, a capacitor that is connected between the error amplifier and a gate of the N-channel transistor, and a comparator that is connected to a node between the error amplifier and the capacitor. The apparatus also includes a charge pump that is switchably connected to the gate of the N-channel transistor. The apparatus is adapted to connect the charge pump to the gate of the N-channel transistor when a voltage at the node between the error amplifier and the capacitor rises above a threshold voltage.Type: ApplicationFiled: April 10, 2009Publication date: October 14, 2010Inventors: Erhan Ozalevli, Luthuli E. Dake, Gregory Romas, Ching-yuh Tsay
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Publication number: 20100156384Abstract: Methods and apparatus for higher-order correction of bandgap voltage references are disclosed. An example bandgap voltage reference circuit disclosed herein comprises a bandgap voltage generation circuit comprising a first resistor, the bandgap voltage generation circuit configured to generate a proportional-to-absolute-temperature current to drive the first resistor to produce a first voltage, the first voltage contributing to an output bandgap voltage, and a first correction circuit electrically coupled to the first resistor and configured to provide a first correction current, the first correction circuit comprising a first nonlinear device configured to generate the first correction current only within a first temperature range, the first correction current decreasing with increasing temperature, the first correction current to drive the first resistor to increase the first voltage only within the first temperature range.Type: ApplicationFiled: December 18, 2008Publication date: June 24, 2010Inventors: Erhan Ozalevli, Luthuli E. Dake, Gregory Romas, Gary L. Wakeman
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Patent number: 7728575Abstract: Methods and apparatus for higher-order correction of bandgap voltage references are disclosed. An example bandgap voltage reference circuit disclosed herein comprises a bandgap voltage generation circuit comprising a first resistor, the bandgap voltage generation circuit configured to generate a proportional-to-absolute-temperature current to drive the first resistor to produce a first voltage, the first voltage contributing to an output bandgap voltage, and a first correction circuit electrically coupled to the first resistor and configured to provide a first correction current, the first correction circuit comprising a first nonlinear device configured to generate the first correction current only within a first temperature range, the first correction current decreasing with increasing temperature, the first correction current to drive the first resistor to increase the first voltage only within the first temperature range.Type: GrantFiled: December 18, 2008Date of Patent: June 1, 2010Assignee: Texas Instruments IncorporatedInventors: Erhan Ozalevli, Luthuli E. Dake, Gregory Romas, Gary L. Wakeman
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Publication number: 20100117707Abstract: In accordance with an aspect of the present invention, an external FET driving circuit includes a driving portion, a drain-to-gate clamp portion and a current feedback portion. The driving portion provides a driving signal to the external FET. The drain-to-gate clamp portion protects the external FET from flyback current, when the external FET is quickly turned OFF. The current feedback portion controls the driving signal provided by the driver.Type: ApplicationFiled: November 12, 2008Publication date: May 13, 2010Inventors: Erhan Ozalevli, Luthuli Dake, Rashed Anam
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Patent number: 7348909Abstract: Disclosed herein is a reconfigurable mixed signal distributed arithmetic system including: an array of tunable voltage references operable for receiving a delayed digital input signal; a combination device in electrical communication with the array of tunable floating-gate voltage references that selectively combines an output of the array of tunable voltage references into an analog output signal; and a feedback element in electrical communication with the combination device, wherein the array of tunable voltages and the delayed digital input signal combine to perform a distributed arithmetic function and the reconfigurable mixed signal distributed arithmetic system responsively generates the analog output signal.Type: GrantFiled: August 17, 2006Date of Patent: March 25, 2008Assignee: Georgia Tech Research CorporationInventors: Erhan Ozalevli, Paul Hasler, David Verl Anderson, Walter Geeshan Huang