Patents by Inventor Abbas Komijani

Abbas Komijani 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).

  • Patent number: 9246435
    Abstract: A method and apparatus for charging a crystal oscillator are provided. A voltage generating module outputs a ramp voltage signal to a ring oscillator. The ring oscillator generates and outputs a waveform based on the ramp voltage signal. The ramp voltage signal facilitates the ring oscillator to output the waveform at a frequency that varies with time, wherein the varying frequency is within a frequency range of the crystal oscillator. An inverter generates a digital input signal based on the waveform. The digital input signal is sent to an input of the crystal oscillator for charging the crystal oscillator. A feedback module outputs a feedback signal based on the digital input signal, wherein the feedback signal controls the voltage generating module to generate a fixed voltage signal that facilitates the ring oscillator to output the waveform at a frequency that is equal to a resonance frequency of the crystal oscillator.
    Type: Grant
    Filed: February 9, 2015
    Date of Patent: January 26, 2016
    Assignee: QUALCOMM Incorporated
    Inventors: Amirpouya Kavousian, Yashar Rajavi, Alireza Khalili, Mohammad Bagher Vahid Far, Abbas Komijani
  • Publication number: 20160020752
    Abstract: A method and apparatus for minimizing transmit signal interference is provided. The method includes the steps of: receiving a signal and amplifying the received signal. The received signal is then mixed with an intermediate frequency signal to obtain a baseband modulated signal. The baseband modulated signal is first filtered in an RC filter. The resulting signal is then divided by a preselected amount and the first divided portion is sent to a main path of a biquad filter, which produces a first stage biquad filtered signal. The second portion of the divided signal is sent to an auxiliary path of the biquad filter, and produces a second filtered signal. The first and second signals are then recombined and sent to the second stage of the biquad filter, where further filtering takes place.
    Type: Application
    Filed: July 15, 2014
    Publication date: January 21, 2016
    Inventors: Mohammad Bagher Vahid Far, Cheng-Han Wang, Jesse Aaron Richmond, Thinh Cat Nguyen, Abbas Komijani, Yashar Rajavi, Alireza Khalili
  • Patent number: 9225369
    Abstract: An apparatus includes a main amplifier configured to receive an input signal. The main amplifier is also configured to generate an output signal. The apparatus also includes an auxiliary path configured to phase-shift the input signal to generate a cancellation signal to reduce or cancel a blocker component of the output signal.
    Type: Grant
    Filed: January 17, 2014
    Date of Patent: December 29, 2015
    Assignee: Qualcomm Incorporated
    Inventors: Mohammad Bagher Vahid Far, Abbas Komijani, Amirpouya Kavousian, Mazhareddin Taghivand, Alireza Khalili
  • Patent number: 9160584
    Abstract: A method and apparatus are disclosed for mitigating a frequency spur included with a transmitter output signal from a wireless device. For at least some embodiments, the wireless device may include an auxiliary synthesizer to generate a spur cancellation signal to be summed with the transmitter output signal to cancel or reduce the frequency spur. The auxiliary synthesizer may also generate an auxiliary clock signal to demodulate a received communication signal. In some embodiments, the transmitter output signal may be looped back to a receiver of the wireless device to determine whether the frequency spur is reduced below a threshold. Data from the receiver may be used to modify the spur cancellation signal.
    Type: Grant
    Filed: January 22, 2015
    Date of Patent: October 13, 2015
    Assignee: QUALCOMM Incorporated
    Inventors: Amirpouya Kavousian, Yashar Rajavi, Richard Tzewei Chang, Alireza Khalili, Mohammad Bagher Vahid Far, Abbas Komijani
  • Publication number: 20150286235
    Abstract: Certain aspects of the present disclosure provide voltage regulating circuits which are power efficient, low noise, and substantially insensitive to changes in process technology, power supply voltage, and temperature. Such circuits may be used to provide the regulated voltage for a voltage-controlled oscillator (VCO), for example, as found in a radio frequency front end (RFFE). One example voltage regulating circuit generally includes a current source configured to supply or sink a reference current and a current mirror having a bias branch and a main branch, wherein the bias branch is connected with the current source, wherein the main branch includes a source follower to provide the regulated voltage, and wherein the reference current is available at a node for the regulated voltage.
    Type: Application
    Filed: April 3, 2014
    Publication date: October 8, 2015
    Applicant: QUALCOMM INCORPORATED
    Inventors: Mohammad Bagher VAHID FAR, Abbas KOMIJANI, Chan Hong PARK
  • Publication number: 20150207531
    Abstract: An apparatus includes a main amplifier configured to receive an input signal. The main amplifier is also configured to generate an output signal. The apparatus also includes an auxiliary path configured to phase-shift the input signal to generate a cancellation signal to reduce or cancel a blocker component of the output signal.
    Type: Application
    Filed: January 17, 2014
    Publication date: July 23, 2015
    Applicant: QUALCOMM Incorporated
    Inventors: Mohammad Bagher Vahid Far, Abbas Komijani, Amirpouya Kavousian, Mazhareddin Taghivand, Alireza Khalili
  • Patent number: 9048850
    Abstract: A frequency synthesizer is disclosed that includes an oscillator having an output to deliver a signal of a controllable frequency. The oscillator includes a capacitor bank responsive to an N-bit control signal to exhibit a capacitance. The oscillator output frequency is based on the capacitance. Control logic generates the N-bit control signal and determines each bit of the N-bit control signal through a binary search step and a modulation of a least-significant-bit (LSB) of the N-bit control signal. The LSB modulation, combined with the binary search for each bit, results in a higher accuracy frequency estimation.
    Type: Grant
    Filed: March 12, 2013
    Date of Patent: June 2, 2015
    Assignee: QUALCOMM Incorporated
    Inventors: Abbas Komijani, Emmanouil Terrovitis, Justin A. Hwang
  • Patent number: 8884707
    Abstract: An oscillator is disclosed that can generate an oscillation signal using a latch and two delay elements. For some embodiments, the oscillator includes an SR latch, a first delay element, and a second delay element. The SR latch has a first input, a second input, a first output, and a second output. The first delay element is coupled between the first output and the first input of the SR latch. The second delay element is coupled between the second output and the second input of the SR latch. For some embodiments, the first and second delay elements include a programmable pull-up circuit that allows the charging current to be adjusted in discrete amounts, and include a programmable capacitor circuit that allows the capacitance value to be adjusted in discrete amounts.
    Type: Grant
    Filed: October 12, 2012
    Date of Patent: November 11, 2014
    Assignee: QUALCOMM Incorporated
    Inventors: Emmanouil Terrovitis, Abbas Komijani
  • Publication number: 20140286450
    Abstract: Embodiments of a communication circuit are described. This communication circuit includes an input node to receive a set of data symbols and a partitioner coupled to the input node. This partitioner is to divide the set of data symbols into M irregular subgroups of data symbols, a given one of which includes non-consecutive data symbols in the set of data symbols. Moreover, this given irregular subgroup of data symbols includes at least two pairs of adjacent data symbols having different inter-data-symbol spacings in the set of data symbols. This communication circuit also includes M modulators coupled to the partitioner, where the given irregular subgroup of data symbols is coupled to a given modulator in the M modulators. Furthermore, the communication circuit includes M output nodes, where a given output node in the M output nodes is coupled to the given modulator and is to couple to an antenna element in M antenna elements.
    Type: Application
    Filed: October 29, 2013
    Publication date: September 25, 2014
    Applicant: Rambus Inc.
    Inventors: Aliazam Abbasfar, Abbas Komijani
  • Publication number: 20140002205
    Abstract: A frequency synthesizer is disclosed that includes an oscillator having an output to deliver a signal of a controllable frequency. The oscillator includes a capacitor bank responsive to an N-bit control signal to exhibit a capacitance. The oscillator output frequency is based on the capacitance. Control logic generates the N-bit control signal and determines each bit of the N-bit control signal through a binary search step and a modulation of a least-significant-bit (LSB) of the N-bit control signal. The LSB modulation, combined with the binary search for each bit, results in a higher accuracy frequency estimation.
    Type: Application
    Filed: March 12, 2013
    Publication date: January 2, 2014
    Applicant: QUALCOMM Incorporated
    Inventors: Abbas Komijani, Emmanouil Terrovitis, Justin A. Hwang
  • Publication number: 20140002198
    Abstract: An oscillator is disclosed that can generate an oscillation signal using a latch and two delay elements. For some embodiments, the oscillator includes an SR latch, a first delay element, and a second delay element. The SR latch has a first input, a second input, a first output, and a second output. The first delay element is coupled between the first output and the first input of the SR latch. The second delay element is coupled between the second output and the second input of the SR latch. For some embodiments, the first and second delay elements include a programmable pull-up circuit that allows the charging current to be adjusted in discrete amounts, and include a programmable capacitor circuit that allows the capacitance value to be adjusted in discrete amounts.
    Type: Application
    Filed: October 12, 2012
    Publication date: January 2, 2014
    Applicant: Qualcomm Incorporated
    Inventors: Emmanouil TERROVITIS, Abbas Komijani
  • Patent number: 8571126
    Abstract: Embodiments of a communication circuit are described. This communication circuit includes an input node (212) to receive a set of data symbols and a partitioner (216) coupled to the input node. The partitioner is to divide the set of data symbols into M irregular subgroups of data symbols, a given one of which includes non-consecutive data symbols in the set of data symbols. Moreover, this given irregular subgroup of data symbols includes at least two pairs of adjacent data symbols having different inter-data-symbol spacings in the set of data symbols. This communication circuit also includes M modulators (218-1, 218-N1) coupled to the partitioner, where the given irregular subgroup of data symbols is coupled to a given modulator in the M modulators. Furthermore, the communication circuit includes M output nodes, where a given output node in the M output nodes is coupled to the given modulator and is to couple to an antenna element in M antenna elements (226).
    Type: Grant
    Filed: April 22, 2008
    Date of Patent: October 29, 2013
    Assignee: Rambus Inc.
    Inventors: Aliazam Abbasfar, Abbas Komijani
  • Patent number: 8482462
    Abstract: Embodiments in the present disclosure pertain to a multi-antenna beam-forming system for transmitting constant envelope signals decomposed from a variable envelope signal. The variable envelope signal is decomposed into two constant envelope signals. Each of the constant envelope signals are separately amplified by power amplifiers and transmitted over separate antennas. Beam steering delays can be added to the transmit paths of the constant envelope signals to direct the beam to the location of a receiver. The transmitted constant envelope signals combine through spatial out-phasing such that a receiving antenna receives a variable envelope signal.
    Type: Grant
    Filed: October 5, 2009
    Date of Patent: July 9, 2013
    Assignee: Rambus Inc.
    Inventors: Abbas Komijani, Aliazam Abbasfar
  • Patent number: 8350625
    Abstract: A power amplifier circuit comprising a scalable power amplifier including an input and an output, and a plurality of activated amplifier elements operative to produce an output signal at the output, and operative to dynamically vary a power output level of the output signal. A variable impedance circuit operatively responsive to dynamically load the output of the scalable power amplifier. Wherein the scalable power amplifier further includes an amplifier configuration circuit operatively responsive to selectively activate the selectively activated amplifier elements by at least reducing power to at least one of the selectively activated amplifier elements.
    Type: Grant
    Filed: September 13, 2011
    Date of Patent: January 8, 2013
    Assignee: California Institute of Technology
    Inventors: Abbas Komijani, Seyed-Ali Hajimiri, Scott D. Kee, Ichiri Aoki
  • Patent number: 8169266
    Abstract: 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: Grant
    Filed: August 8, 2007
    Date of Patent: May 1, 2012
    Assignee: WiLinx Corporation
    Inventors: Edris Rostami, Rahim Bagheri, Masoud Djafari, Abbas Komijani
  • Publication number: 20120001692
    Abstract: Reconfigurable distributed active transformers are provided. The exemplary embodiments provided allow changing of the effective number and configuration of the primary and secondary windings, where the distributed active transformer structures can be reconfigured dynamically to control the output power levels, allow operation at multiple frequency bands, maintain a high performance across multiple channels, and sustain desired characteristics across process, temperature and other environmental variations. Integration of the distributed active transformer power amplifiers and a low noise amplifier on a semiconductor substrate can also be provided.
    Type: Application
    Filed: September 13, 2011
    Publication date: January 5, 2012
    Inventors: Abbas Komijani, Seyed-Ali Hajimiri, Scott D. Kee, Ichiri Aoki
  • Patent number: 8018283
    Abstract: Reconfigurable distributed active transformers are provided. The exemplary embodiments provided allow changing of the effective number and configuration of the primary and secondary windings, where the distributed active transformer structures can be reconfigured dynamically to control the output power levels, allow operation at multiple frequency bands, maintain a high performance across multiple channels, and sustain desired characteristics across process, temperature and other environmental variations. Integration of the distributed active transformer power amplifiers and a low noise amplifier on a semiconductor substrate can also be provided.
    Type: Grant
    Filed: June 8, 2010
    Date of Patent: September 13, 2011
    Assignee: California Institute of Technology
    Inventors: Abbas Komijani, Seyed-Ali Hajimiri, Scott D. Kee, Ichiro Aoki
  • Patent number: 7812775
    Abstract: A phased array mm-wave device includes a substrate, a mm-wave transmitter integrated onto the substrate configured to transmit a mm-wave signal and/or a mm-wave receiver integrated onto the substrate and configured to receive a mm-wave signal. The mm-wave device also includes a phased array antenna system integrated onto the substrate and including two or more antenna elements. The phased array mm-wave device also includes one or more dielectric lenses. A distributed mm-wave distributed combining tree circuit includes at least two pairs of differential transconductors with regenerative degeneration and accepts at least two differential input signals. Two mm-wave loopback methods measure the phased array antenna patterns and the performance of an integrated receiver transmitter system.
    Type: Grant
    Filed: September 22, 2006
    Date of Patent: October 12, 2010
    Assignee: California Institute of Technology
    Inventors: Aydin Babakhani, Xiang Guan, Seyed Ali Hajimiri, Abbas Komijani, Arun Natarajan
  • Publication number: 20100244955
    Abstract: Reconfigurable distributed active transformers are provided. The exemplary embodiments provided allow changing of the effective number and configuration of the primary and secondary windings, where the distributed active transformer structures can be reconfigured dynamically to control the output power levels, allow operation at multiple frequency bands, maintain a high performance across multiple channels, and sustain desired characteristics across process, temperature and other environmental variations. Integration of the distributed active transformer power amplifiers and a low noise amplifier on a semiconductor substrate can also be provided.
    Type: Application
    Filed: June 8, 2010
    Publication date: September 30, 2010
    Inventors: Abbas Komijani, Seyed-Ali Hajimiri, Scott D. Kee, Ichiro Aoki
  • Publication number: 20100231452
    Abstract: A phased array mm-wave device includes a substrate, a mm-wave transmitter integrated onto the substrate configured to transmit a mm-wave signal and/or a mm-wave receiver integrated onto the substrate and configured to receive a mm-wave signal. The mm-wave device also includes a phased array antenna system integrated onto the substrate and including two or more antenna elements. The phased array mm-wave device also includes one or more dielectric lenses. A distributed mm-wave distributed combining tree circuit includes at least two pairs of differential transconductors with regenerative degeneration and accepts at least two differential input signals. Two mm-wave loopback methods measure the phased array antenna patterns and the performance of an integrated receiver transmitter system.
    Type: Application
    Filed: September 22, 2006
    Publication date: September 16, 2010
    Applicant: California Institute of Technology
    Inventors: Aydin Babakhani, Xiang Guan, Seyed Ali Hajimiri, Abbas Komijani, Arun Natarajan