Patents by Inventor Rahim Bagheri
Rahim Bagheri 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: 20240063923Abstract: Examples relate to setting a performance mode of an RF receiver front end. An example method includes determining a power state of an input signal to an RF receiver front end; and setting a performance mode of the RF receiver front end to one of at least three distinct performance modes offered by the RF receiver front end at least partially responsive to the determined power state of the input signal.Type: ApplicationFiled: August 22, 2023Publication date: February 22, 2024Inventors: Saeed Pourbagheri, Pansop Kim, Rahim Bagheri, Omid Rajaee, Hyunchul Kim, Amr Aly, Mohammad Mehrjoo, Sheng Liu
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Publication number: 20230378974Abstract: Delta-sigma modulation utilizing continuous-time input and discrete-time loop filter. An apparatus includes an input circuit, a switched-capacitor, an integrator, a quantizer and a feedback loop. The input circuit receives an analog signal and produce an analog input signal, the input circuit comprising a resistor-capacitor (RC) integrator. The switched-capacitor samples the analog input signal and produce a discrete-time, sampled input signal. The integrator processes the discrete-time, sampled input signal. The quantizer converts an output of the integrator to a digital signal. The feedback loop provides the digital signal to respective inputs of the RC integrator and the integrator.Type: ApplicationFiled: May 19, 2023Publication date: November 23, 2023Inventors: Omid Rajaee, Rahim Bagheri
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Patent number: 10805117Abstract: Embodiments of the present disclosure include an OFDM receiver circuit, which includes an FFT circuit configured to calculate an FFT of a plurality of sample values received by the receiver circuit, and a smoothing circuit configured to identify equalizer coefficients for the sample values by truncating portions of an impulse response of the FFT.Type: GrantFiled: July 6, 2017Date of Patent: October 13, 2020Assignee: MICROCHIP TECHNOLOGY INCORPORATEDInventors: Hamid Shafiee, Mohsen Pourkhaatoun, Kiran Gowda, Siddharth Shetty, Esmael Heidari, Ali Fard, Rahim Bagheri, Masoud Djafari
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Patent number: 10784891Abstract: Various embodiments relate to delta-sigma loop filters with input feedforward. A delta-sigma loop filter may include a first integrator and a quantizer having an input coupled to an output of the first integrator. The delta-sigma loop filter may further include a first summing node having an output coupled to an input of the first integrator. Further, the delta-sigma loop filter may include a feedforward path from an input of the delta-sigma loop filter to a first input of the first summing node. The delta-sigma loop filter may also include a first feedback path from an output of the quantizer to a second input of the first summing node.Type: GrantFiled: October 2, 2018Date of Patent: September 22, 2020Assignee: Microchip Technology IncorporatedInventors: Omid Rajaee, Rahim Bagheri, Saeed Pourbagheri, Mohammad Mehrjoo, Mahdi Bagheri, Edwin Chiem, Jun Wang
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Patent number: 10756751Abstract: Various embodiments relate to an analog-to-digital converter (ADC). The ADC may include a first channel including a first delta-sigma loop filter and a second channel including a second delta-sigma loop filter. Each of the first delta-sigma loop filter and the second delta-sigma loop filter may include a first integrator and a quantizer having an input coupled to an output of the first integrator. Each of the first delta-sigma loop filter and the second delta-sigma loop filter may also include a first summing node having an output coupled to an input of the first integrator, and a feedforward path from an input of the delta sigma loop filter to a first input of the first summing node. Further, each of the first delta-sigma loop filter and the second delta-sigma loop filter may include a first feedback path from an output of the quantizer to a second input of the first summing node.Type: GrantFiled: October 31, 2018Date of Patent: August 25, 2020Assignee: Microchip Technology IncorporatedInventors: Omid Rajaee, Rahim Bagheri, Saeed Pourbagheri, Mohammad Mehrjoo, Mahdi Bagheri, Edwin Chiem, Jun Wang
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Publication number: 20190348996Abstract: Various embodiments relate to an analog-to-digital converter (ADC). The ADC may include a first channel including a first delta-sigma loop filter and a second channel including a second delta-sigma loop filter. Each of the first delta-sigma loop filter and the second delta-sigma loop filter may include a first integrator and a quantizer having an input coupled to an output of the first integrator. Each of the first delta-sigma loop filter and the second delta-sigma loop filter may also include a first summing node having an output coupled to an input of the first integrator, and a feedforward path from an input of the delta-signal loop filter to a first input of the first summing node. Further, each of the first delta-sigma loop filter and the second delta-sigma loop filter may include a first feedback path from an output of the quantizer to a second input of the first summing node.Type: ApplicationFiled: October 31, 2018Publication date: November 14, 2019Inventors: Omid Rajaee, Rahim Bagheri, Saeed Pourbagheri, Mohammad Mehrjoo, Mahdi Bagheri, Edwin Chiem, Jun Wang
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Publication number: 20190348995Abstract: Various embodiments relate to delta-sigma loop filters with input feedforward. A delta-sigma loop filter may include a first integrator and a quantizer having an input coupled to an output of the first integrator. The delta-sigma loop filter may further include a first summing node having an output coupled to an input of the first integrator. Further, the delta-sigma loop filter may include a feedforward path from an input of the delta-sigma loop filter to a first input of the first summing node. The delta-sigma loop filter may also include a first feedback path from an output of the quantizer to a second input of the first summing node.Type: ApplicationFiled: October 2, 2018Publication date: November 14, 2019Inventors: Omid Rajaee, Rahim Bagheri, Saeed Pourbagheri, Mohammad Mehrjoo, Mahdi Bagheri, Edwin Chiem, Jun Wang
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Patent number: 10122568Abstract: A receiver circuit includes a conversion circuit configured to down-convert a received radio-frequency signal to a baseband signal, an analog-to-digital converter configured to sample the baseband signal into a sampled signal, a Fast Fourier transform (FFT) circuit configured to perform an FFT on the sampled signal, and a digital compensation circuit configured to compensate for IQ distortion in a frequency domain.Type: GrantFiled: July 6, 2017Date of Patent: November 6, 2018Assignee: MICROCHIP TECHNOLOGY INCORPORATEDInventors: Hamid Shafiee, Mohsen Pourkhaatoun, Kiran Gowda, Siddharth Shetty, Esmael Heidari, Ali Fard, Rahim Bagheri, Masoud Djafari
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Publication number: 20180013605Abstract: A receiver circuit includes a conversion circuit configured to down-convert a received radio-frequency signal to a baseband signal, an analog-to-digital converter configured to sample the baseband signal into a sampled signal, a Fast Fourier transform (FFT) circuit configured to perform an FFT on the sampled signal, and a digital compensation circuit configured to compensate for IQ distortion in a frequency domain.Type: ApplicationFiled: July 6, 2017Publication date: January 11, 2018Applicant: Microchip Technology IncorporatedInventors: Hamid Shafiee, Mohsen Pourkhaatoun, Kiran Gowda, Siddharth Shetty, Esmael Heidari, Ali Fard, Rahim Bagheri, Masoud Djafari
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Publication number: 20180013591Abstract: Embodiments of the present disclosure include an OFDM receiver circuit, which includes an FFT circuit configured to calculate an FFT of a plurality of sample values received by the receiver circuit, and a smoothing circuit configured to identify equalizer coefficients for the sample values by truncating portions of an impulse response of the FFT.Type: ApplicationFiled: July 6, 2017Publication date: January 11, 2018Applicant: Microchip Technology IncorporatedInventors: Hamid Shafiee, Mohsen Pourkhaatoun, Kiran Gowda, Siddharth Shetty, Esmael Heidari, Ali Fard, Rahim Bagheri, Masoud Djafari
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Patent number: 8179167Abstract: Embodiments of the present invention include methods for wide bandwidth synthesizer circuits and methods. In one embodiment, the present invention includes a frequency synthesizer comprising a multiplexer and a band group selector. The multiplexer is coupled to receive a plurality of sinusoidal signals. Each sinusoidal signal has a unique frequency. The band group selector selects between a plurality of band groups. The band group selector is coupled to receive a first signal from the multiplexer. The multiplexer multiplexes between the plurality of sinusoidal signals and provides the first signal. The band group selector includes a band mixer. The band mixer mixes the first signal with a band signal having a band frequency. The band signal corresponds to a band group selected from the plurality of band groups. The band group selector provides a transmitter mixer signal and a receiver mixer signal.Type: GrantFiled: March 10, 2009Date of Patent: May 15, 2012Assignee: WiLinx CorporationInventors: Mahdi Bagheri, Ali Karimi-Sanjaaani, Edris Rostami, Masoud Djafari, Mohammad E. Heidari, Rahim Bagheri
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Patent number: 8169266Abstract: Embodiments of the present invention include circuits and methods for improving the spectral purity of mixer circuits. In one embodiment the present invention includes a mixer circuit comprising a first transistor having a gate, a source and a drain, a second transistor having a gate, a source and a drain, a first capacitance coupled between the source of the first transistor and the source of the second transistor and a bias circuit having an input, a first output coupled to the source of the first transistor and a second output coupled to the source of the second transistor. The present invention may be advantageously used in a wireless transmitter application.Type: GrantFiled: August 8, 2007Date of Patent: May 1, 2012Assignee: WiLinx CorporationInventors: Edris Rostami, Rahim Bagheri, Masoud Djafari, Abbas Komijani
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Publication number: 20120089005Abstract: A multi-modal medical imaging and type detection have been described have been disclosed. By combining a broadband radio imaging system and one or more other modalities of image processing an enhanced image and/or tissue classification can be produced.Type: ApplicationFiled: October 10, 2011Publication date: April 12, 2012Applicant: WiLinx CorporationInventors: Rahim Bagheri, Ghobad Heidari-Bateni
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Publication number: 20110267148Abstract: A Multiphase VCO Circuits and Methods with Wide Tuning Range have been disclosed.Type: ApplicationFiled: April 27, 2011Publication date: November 3, 2011Applicant: WiLinx CorporationInventors: Mahdi Bagheri, Rahim Bagheri
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Patent number: 7941475Abstract: Embodiments of the present invention include programmable filter circuits and methods. In one embodiment, the present invention includes a programmable filter for filtering an input signal comprising a storage element for storing a plurality of digital values representing a discrete time window function, and a plurality of filter channels, each channel comprising a multiplying digital-to-analog converter having a plurality of digital inputs coupled to the storage element and an analog input for receiving said input signal to be filtered, at least one capacitor having at least one terminal coupled to an output of the multiplying digital-to-analog converter, and a sampling device coupled between the at least one terminal of the at least one capacitor and an output of the filter. In another embodiment, the present invention includes a software defined radio.Type: GrantFiled: August 9, 2006Date of Patent: May 10, 2011Assignee: WiLinx CorporationInventors: Rahim Bagheri, Ahmad Mirzaei
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Patent number: 7924802Abstract: Embodiments of the present invention transmit signals simultaneously over a communication channel at different RF center frequencies, and may use a single power amplifier and antenna. In one embodiment the present invention includes a method of transmitting information in a wireless communication channel comprising receiving digital signals having data to be transmitted, converting the signals to analog signals, up-converting each analog signal, combining the up-converted signals, amplifying the combined up-converted signal and transmitting the combined up-converted signal. In one embodiment, the same data is sent over a transmission channel at two different frequencies to improve reliability.Type: GrantFiled: January 23, 2008Date of Patent: April 12, 2011Assignee: WiLinx CorporationInventors: Alireza Tarighat-Mehrabani, Rahim Bagheri, Alireza Mehrnia, Mahmoud Darvishzadeh
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Publication number: 20100233979Abstract: Embodiments of the present invention include methods for wide bandwidth synthesizer circuits and methods. In one embodiment, the present invention includes a frequency synthesizer comprising a multiplexer and a band group selector. The multiplexer is coupled to receive a plurality of sinusoidal signals. Each sinusoidal signal has a unique frequency. The band group selector selects between a plurality of band groups. The band group selector is coupled to receive a first signal from the multiplexer. The multiplexer multiplexes between the plurality of sinusoidal signals and provides the first signal. The band group selector includes a band mixer. The band mixer mixes the first signal with a band signal having a band frequency. The band signal corresponds to a band group selected from the plurality of band groups. The band group selector provides a transmitter mixer signal and a receiver mixer signal.Type: ApplicationFiled: March 10, 2009Publication date: September 16, 2010Applicant: WiLinx CorporationInventors: Mahdi Bagheri, Ali Karimi-Sanjaaani, Edris Rostami, Masoud Djafari, Mohammad E. Heidari, Rahim Bagheri
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Patent number: 7764103Abstract: In one embodiment, the present invention includes an electronic circuit comprising a first stage having a first differential inductive element and a second differential inductive element, and a second stage coupled to an output of the first stage, the second stage having a first differential inductive element and a second differential inductive element, wherein the first and second differential inductive elements of the first stage couple magnetically to generate a first phase error, wherein the first and second differential inductive elements of the second stage couple magnetically to generate a second phase error, and wherein the second phase error cancels the first phase error.Type: GrantFiled: August 25, 2008Date of Patent: July 27, 2010Assignee: WiLinx CorporationInventors: Mahdi Bagheri, Kaveh Moazzami, Filipp A. Baron, Mohammad E. Heidari, Rahim Bagheri
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Publication number: 20100044093Abstract: In one embodiment the present invention includes an electrical arrangement comprising conductive elements such as electrical traces. The conductive elements carry differential signals. The conductive elements extend horizontally and have alternating sections around one or more center lines. Ground lines may be included the further enhance signal integrity. In one embodiment, magnetic field cancellation may be achieved by providing an offset between pairs of alternating differential elements.Type: ApplicationFiled: August 25, 2008Publication date: February 25, 2010Applicant: WiLinx CorporationInventors: Kaveh Moazzami, Mahdi Bagheri, Edris Rostami, Rahim Bagheri
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Publication number: 20100045404Abstract: In one embodiment, the present invention includes an electronic circuit comprising a first stage having a first differential inductive element and a second differential inductive element, and a second stage coupled to an output of the first stage, the second stage having a first differential inductive element and a second differential inductive element, wherein the first and second differential inductive elements of the first stage couple magnetically to generate a first phase error, wherein the first and second differential inductive elements of the second stage couple magnetically to generate a second phase error, and wherein the second phase error cancels the first phase error.Type: ApplicationFiled: August 25, 2008Publication date: February 25, 2010Applicant: WiLinx CorporationInventors: Mahdi Bagheri, Kaveh Moazzami, Filipp A. Baron, Mohammad E. Heidari, Rahim Bagheri