Patents by Inventor Seyed Amir Reza Ahmadi Mehr
Seyed Amir Reza Ahmadi Mehr 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: 10749503Abstract: A discrete time filter network with an input signal connection and an output signal connection and comprising a capacitor bank with a plurality of history capacitors, and at least one sampling capacitor which operates at a predetermined cycling rate to couple to at least one history capacitor at a time, which history capacitor is selected from the capacitor bank so as to share electrical charge between such selected history capacitor and the sampling capacitor, wherein there is a plurality of sampling capacitors that are provided in the capacitor bank, and the discrete time filter network is provided with at least one switch network comprising a plurality of clock driven switches for making selected cyclical connections between the sampling capacitors and the history capacitors in the capacitor bank at the predetermined cycling rate.Type: GrantFiled: January 3, 2019Date of Patent: August 18, 2020Assignee: QUALINX B.V.Inventors: Iman Madadi, Massoud Tohidian, Seyed Amir Reza Ahmadi Mehr
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Publication number: 20190140610Abstract: A discrete time filter network with an input signal connection and an output signal connection and comprising a capacitor bank with a plurality of history capacitors, and at least one sampling capacitor which operates at a predetermined cycling rate to couple to at least one history capacitor at a time, which history capacitor is selected from the capacitor bank so as to share electrical charge between such selected history capacitor and the sampling capacitor, wherein there is a plurality of sampling capacitors that are provided in the capacitor bank, and the discrete time filter network is provided with at least one switch network comprising a plurality of clock driven switches for making selected cyclical connections between the sampling capacitors and the history capacitors in the capacitor bank at the predetermined cycling rate.Type: ApplicationFiled: January 3, 2019Publication date: May 9, 2019Inventors: Iman Madadi, Massoud Tohidian, Seyed Amir Reza Ahmadi Mehr
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Patent number: 9641164Abstract: A quadrature LC tank based digitally controlled ring oscillator (DCO). The oscillator structure incorporates a plurality of stages, each stage including a buffer and a series LC tank. Four stages are coupled together to create a 360 degree phase shift around a loop. The oscillation frequency of the oscillator is the same as the resonant frequency of each LC tank, therefore it avoids quality factor degradation of LC tanks found in the prior art. In one example embodiment, class-D amplifiers are used to drive each of the LC tanks. Capacitor banks before at the input and output of the buffers provide coarse and fine tuning of the frequency of oscillation. The high efficiency exhibited by these amplifiers results in very good phase noise performance of this oscillator. The oscillator utilizes a startup circuit to launch oscillation upon power on.Type: GrantFiled: November 19, 2014Date of Patent: May 2, 2017Assignee: Technische Universiteit DelftInventors: Massoud Tohidian, Robert Bogdan Staszewski, Ali Fotowat Ahmady, Seyed Amir Reza Ahmadi Mehr, Mahmoud Kamarei, Fabien Ndagijimana
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Publication number: 20170104455Abstract: A quadrature LC tank based digitally controlled ring oscillator (DCO). The oscillator structure incorporates a plurality of stages, each stage including a buffer and a series LC tank. Four stages are coupled together to create a 360 degree phase shift around a loop. The oscillation frequency of the oscillator is the same as the resonant frequency of each LC tank, therefore it avoids quality factor degradation of LC tanks found in the prior art. In one example embodiment, class-D amplifiers are used to drive each of the LC tanks. Capacitor banks before at the input and output of the buffers provide coarse and fine tuning of the frequency of oscillation. The high efficiency exhibited by these amplifiers results in very good phase noise performance of this oscillator. The oscillator utilizes a startup circuit to launch oscillation upon power on.Type: ApplicationFiled: December 21, 2016Publication date: April 13, 2017Applicant: Technische Universiteit DelftInventors: Massoud Tohidian, Robert Bogdan Staszewski, Ali Fotowat Ahmady, Seyed Amir Reza Ahmadi Mehr, Mahmoud Kamarei, Fabien Ndagijimana
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Patent number: 9306690Abstract: The invention provides a transmitter comprising two (or more) phase locked loops controlling respective oscillators, and implementing different phase modulation. Multiple phases are derived from the respective oscillators, and an edge rotator forms an output signal from a combination of the phases. The oscillators can operate at different frequencies, neither of which is an integer multiple of the other, whereas the output signals of the multiplexers of the first and second phase locked loops are closer in frequency and can be the same. This reduces the problem of pulling, with a circuit that can be implemented with low power and area and with the versatility of being digitally intensive.Type: GrantFiled: June 11, 2013Date of Patent: April 5, 2016Assignee: SAMBA HOLDCO NETHERLANDS B.V.Inventors: Seyed Amir Reza Ahmadi Mehr, Robert Bogdan Staszewski, Mark Pieter van der Heijden
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Publication number: 20150372665Abstract: A quadrature LC tank based digitally controlled ring oscillator (DCO). The oscillator structure incorporates a plurality of stages, each stage including a buffer and a series LC tank. Four stages are coupled together to create a 360 degree phase shift around a loop. The oscillation frequency of the oscillator is the same as the resonant frequency of each LC tank, therefore it avoids quality factor degradation of LC tanks found in the prior art. In one example embodiment, class-D amplifiers are used to drive each of the LC tanks Capacitor banks before at the input and output of the buffers provide coarse and fine tuning of the frequency of oscillation. The high efficiency exhibited by these amplifiers results in very good phase noise performance of this oscillator. The oscillator utilizes a startup circuit to launch oscillation upon power on.Type: ApplicationFiled: November 19, 2014Publication date: December 24, 2015Applicant: Technische Universiteit DelftInventors: Massoud Tohidian, Robert Bogdan Staszewski, Ali Fotowat Ahmady, Seyed Amir Reza Ahmadi Mehr, Mahmoud Kamarei, Fabien Ndagijimana
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Publication number: 20130343173Abstract: The invention provides a transmitter comprising two (or more) phase locked loops controlling respective oscillators, and implementing different phase modulation. Multiple phases are derived from the respective oscillators, and an edge rotator forms an output signal from a combination of the phases. The oscillators can operate at different frequencies, neither of which is an integer multiple of the other, whereas the output signals of the multiplexers of the first and second phase locked loops are closer in frequency and can be the same. This reduces the problem of pulling, with a circuit that can be implemented with low power and area and with the versatility of being digitally intensive.Type: ApplicationFiled: June 11, 2013Publication date: December 26, 2013Applicant: NXP B.V.Inventors: Seyed Amir Reza Ahmadi Mehr, Robert Bogdan Staszewski, Mark Pieter van der Heijden