Patents by Inventor Kamran SOURI
Kamran SOURI 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: 11791802Abstract: In a timing signal generator having a resonator, one or more temperature-sense circuits generate an analog temperature signal and a digital temperature signal indicative of temperature of the resonator. First and second temperature compensation signal generators to generate, respectively, an analog temperature compensation signal according to the analog temperature signal and a digital temperature compensation signal according to the digital temperature signal. Clock generating circuitry drives the resonator into mechanically resonant motion and generates a temperature-compensated output timing signal based on the mechanically resonant motion, the analog temperature compensation signal and the digital temperature compensation signal.Type: GrantFiled: October 26, 2022Date of Patent: October 17, 2023Assignee: SiTime CorporationInventors: Saleh Heidary Shalmany, Kamran Souri, Sassan Tabatabaei, U{hacek over (g)}ur Sönmez
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Patent number: 11716055Abstract: An oscillator includes a resonator, sustaining circuit and detector circuit. The sustaining circuit receives a sense signal indicative of mechanically resonant motion of the resonator generates an amplified output signal in response. The detector circuit asserts, at a predetermined phase of the amplified output signal, one or more control signals that enable an offset-reducing operation with respect to the sustaining amplifier circuit.Type: GrantFiled: April 2, 2022Date of Patent: August 1, 2023Assignee: SiTime CorporationInventors: Aaron Partridge, Sassan Tabatabaei, Lijun Chen, Kamran Souri
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Patent number: 11646698Abstract: In an integrated circuit device having a microelectromechanical-system (MEMS) resonator and a temperature transducer, a clock signal is generated by sensing resonant mechanical motion of the MEMS resonator and a temperature signal indicative of temperature of the MEMS resonator is generated via the temperature transducer. The clock signal and the temperature signal are output from the integrated circuit device concurrently.Type: GrantFiled: December 23, 2021Date of Patent: May 9, 2023Assignee: SiTime CorporationInventors: Sassan Tabatabaei, Kamran Souri, Saleh Heidary Shalmany, Charles I. Grosjean
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Patent number: 11528014Abstract: In a timing signal generator having a resonator, one or more temperature-sense circuits generate an analog temperature signal and a digital temperature signal indicative of temperature of the resonator. First and second temperature compensation signal generators to generate, respectively, an analog temperature compensation signal according to the analog temperature signal and a digital temperature compensation signal according to the digital temperature signal. Clock generating circuitry drives the resonator into mechanically resonant motion and generates a temperature-compensated output timing signal based on the mechanically resonant motion, the analog temperature compensation signal and the digital temperature compensation signal.Type: GrantFiled: December 7, 2021Date of Patent: December 13, 2022Assignee: SiTime CorporationInventors: Saleh Heidary Shalmany, Kamran Souri, Sassan Tabatabaei, U{hacek over (g)}ur Sönmez
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Patent number: 11323071Abstract: An oscillator includes a resonator, sustaining circuit and detector circuit. The sustaining circuit receives a sense signal indicative of mechanically resonant motion of the resonator generates an amplified output signal in response. The detector circuit asserts, at a predetermined phase of the amplified output signal, one or more control signals that enable an offset-reducing operation with respect to the sustaining amplifier circuit.Type: GrantFiled: March 12, 2021Date of Patent: May 3, 2022Assignee: SiTime CorporationInventors: Aaron Partridge, Sassan Tabatabaei, Lijun Chen, Kamran Souri
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Patent number: 11245361Abstract: In an integrated circuit device having a microelectromechanical-system (MEMS) resonator and a temperature transducer, a clock signal is generated by sensing resonant mechanical motion of the MEMS resonator and a temperature signal indicative of temperature of the MEMS resonator is generated via the temperature transducer. The clock signal and the temperature signal are output from the integrated circuit device concurrently.Type: GrantFiled: October 1, 2020Date of Patent: February 8, 2022Assignee: SiTime CorporationInventors: Sassan Tabatabaei, Kamran Souri, Saleh Heidary Shalmany, Charles I. Grosjean
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Patent number: 11228302Abstract: In a timing signal generator having a resonator, one or more temperature-sense circuits generate an analog temperature signal and a digital temperature signal indicative of temperature of the resonator. First and second temperature compensation signal generators to generate, respectively, an analog temperature compensation signal according to the analog temperature signal and a digital temperature compensation signal according to the digital temperature signal. Clock generating circuitry drives the resonator into mechanically resonant motion and generates a temperature-compensated output timing signal based on the mechanically resonant motion, the analog temperature compensation signal and the digital temperature compensation signal.Type: GrantFiled: March 11, 2021Date of Patent: January 18, 2022Assignee: SiTime CorporationInventors: Saleh Heidary Shalmany, Kamran Souri, Sassan Tabatabaei, U{hacek over (g)}ur Sönmez
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Patent number: 11005422Abstract: An oscillator includes a resonator, sustaining circuit and detector circuit. The sustaining circuit receives a sense signal indicative of mechanically resonant motion of the resonator generates an amplified output signal in response. The detector circuit asserts, at a predetermined phase of the amplified output signal, one or more control signals that enable an offset-reducing operation with respect to the sustaining amplifier circuit.Type: GrantFiled: March 3, 2020Date of Patent: May 11, 2021Assignee: SiTime CorporationInventors: Aaron Partridge, Sassan Tabatabaei, Lijun Chen, Kamran Souri
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Patent number: 10979031Abstract: In a timing signal generator having a resonator, one or more temperature-sense circuits generate an analog temperature signal and a digital temperature signal indicative of temperature of the resonator. First and second temperature compensation signal generators to generate, respectively, an analog temperature compensation signal according to the analog temperature signal and a digital temperature compensation signal according to the digital temperature signal. Clock generating circuitry drives the resonator into mechanically resonant motion and generates a temperature-compensated output timing signal based on the mechanically resonant motion, the analog temperature compensation signal and the digital temperature compensation signal.Type: GrantFiled: February 5, 2020Date of Patent: April 13, 2021Assignee: SiTime CorporationInventors: Saleh Heidary Shalmany, Kamran Souri, Sassan Tabatabaei, U{hacek over (g)}ur Sönmez
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Patent number: 10833632Abstract: In an integrated circuit device having a microelectromechanical-system (MEMS) resonator and a temperature transducer, a clock signal is generated by sensing resonant mechanical motion of the MEMS resonator and a temperature signal indicative of temperature of the MEMS resonator is generated via the temperature transducer. The clock signal and the temperature signal are output from the integrated circuit device concurrently.Type: GrantFiled: May 2, 2019Date of Patent: November 10, 2020Assignee: SiTime CorporationInventors: Sassan Tabatabaei, Kamran Souri, Saleh Heidary Shalmany, Charles I. Grosjean
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Patent number: 10622945Abstract: An oscillator includes a resonator, sustaining circuit and detector circuit. The sustaining circuit receives a sense signal indicative of mechanically resonant motion of the resonator generates an amplified output signal in response. The detector circuit asserts, at a predetermined phase of the amplified output signal, one or more control signals that enable an offset-reducing operation with respect to the sustaining amplifier circuit.Type: GrantFiled: July 26, 2018Date of Patent: April 14, 2020Assignee: SiTime CorporationInventors: Aaron Partridge, Sassan Tabatabaei, Lijun Chen, Kamran Souri
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Patent number: 10605676Abstract: A method includes: calculating a first calibration temperature based on a first ratio of a known external voltage to a delta voltage that is a difference between first and second base-emitter voltages of first and second sensing transistors, calculating a first sensed temperature based on a second ratio of the first base-emitter voltage to the delta voltage, adjusting one or more temperature fitting parameters based on a comparison of the first sensed temperature with the first calibration temperature; activating the on-chip heater; calculating a second calibration temperature based, at least in part, on a third ratio of the known external voltage to the delta voltage, calculating a second sensed temperature based on a fourth ratio of the first base-emitter voltage to the delta voltage, adjusting at least one of the one or more temperature fitting parameters based on a comparison of the second sensed temperature with the second calibration temperature.Type: GrantFiled: February 2, 2017Date of Patent: March 31, 2020Assignee: NXP B.V.Inventors: Bahman Yousefzadeh, Kamran Souri, Kofi A. A. Makinwa
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Patent number: 10594301Abstract: In a timing signal generator having a resonator, one or more temperature-sense circuits generate an analog temperature signal and a digital temperature signal indicative of temperature of the resonator. First and second temperature compensation signal generators to generate, respectively, an analog temperature compensation signal according to the analog temperature signal and a digital temperature compensation signal according to the digital temperature signal. Clock generating circuitry drives the resonator into mechanically resonant motion and generates a temperature-compensated output timing signal based on the mechanically resonant motion, the analog temperature compensation signal and the digital temperature compensation signal.Type: GrantFiled: June 8, 2018Date of Patent: March 17, 2020Assignee: SiTime CorporationInventors: Saleh Heidary Shalmany, Kamran Souri, Sassan Tabatabaei, U{hacek over (g)}ur Sönmez
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Publication number: 20180217009Abstract: A method includes: calculating a first calibration temperature based on a first ratio of a known external voltage to a delta voltage that is a difference between first and second base-emitter voltages of first and second sensing transistors, calculating a first sensed temperature based on a second ratio of the first base-emitter voltage to the delta voltage, adjusting one or more temperature fitting parameters based on a comparison of the first sensed temperature with the first calibration temperature; activating the on-chip heater; calculating a second calibration temperature based, at least in part, on a third ratio of the known external voltage to the delta voltage, calculating a second sensed temperature based on a fourth ratio of the first base-emitter voltage to the delta voltage, adjusting at least one of the one or more temperature fitting parameters based on a comparison of the second sensed temperature with the second calibration temperature.Type: ApplicationFiled: February 2, 2017Publication date: August 2, 2018Inventors: BAHMAN YOUSEFZADEH, KAMRAN SOURI, KOFI A. A. MAKINWA
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Patent number: 8665130Abstract: An ADC is disclosed which has, as a first stage, a successive approximation converter, or other compensated, direct comparison converter, followed by a sigma delta modulation converter as a second stage. The sigma delta converter may beneficially be a first order modulator. The resulting ADC combines accuracy with low power consumption per conversion, and thus is particularly suited for use in temperature sensors for applications such as RFID transponders. Such a temperature sensor and an RFID transponder are also disclosed. There is also disclosed a method of analog-to-digital conversion, comprising a first successive approximation register or other compensated, direct comparison conversion stage followed by a sigma delta modulation stage, which, further, may be combined with providing a proportional-to-absolute-temperature (PTAT) signal, for low-power, accurate temperature sensing.Type: GrantFiled: February 4, 2011Date of Patent: March 4, 2014Assignee: NXP, B.V.Inventors: Kofi Afolabi Anthony Makinwa, Kamran Souri
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Publication number: 20110200070Abstract: An ADC is disclosed which has, as a first stage, a successive approximation converter, or other compensated, direct comparison converter, followed by a sigma delta modulation converter as a second stage. The sigma delta converter may beneficially be a first order modulator. The resulting ADC combines accuracy with low power consumption per conversion, and thus is particularly suited for use in temperature sensors for applications such as RFID transponders. Such a temperature sensor and an RFID transponder are also disclosed. There is also disclosed a method of analog-to-digital conversion, comprising a first successive approximation register or other compensated, direct comparison conversion stage followed by a sigma delta modulation stage, which, further, may be combined with providing a proportional-to-absolute-temperature (PTAT) signal, for low-power, accurate temperature sensing.Type: ApplicationFiled: February 4, 2011Publication date: August 18, 2011Applicant: NXP B.V.Inventors: Kofi Afolabi Anthony MAKINWA, Kamran SOURI