Patents by Inventor Nasserullah Khan

Nasserullah Khan 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).

  • Publication number: 20130005286
    Abstract: Various embodiments described herein relate to a power management block and an amplification block used in the transmitter of a communication subsystem. The power management block provides improved control for the gain control signal provided to a pre-amplifier and the supply voltage provided to a power amplifier which are both in the amplification block. The power expended by the power amplifier is optimized by employing a continuous control method in which one or more feedback loops are employed to take into account various characteristics of the transmitter components and control values.
    Type: Application
    Filed: September 12, 2012
    Publication date: January 3, 2013
    Applicant: RESEARCH IN MOTION LIMITED
    Inventors: Wen-Yen Chan, Nasserullah Khan
  • Publication number: 20120329411
    Abstract: A power management system and method for a wireless communication device generates an average desired transmit power signal based on at least one of a received signal strength indicator signal and a power control instruction signal from a base station. A power supply level adjustment signal is generated based on the data parameters of an outgoing data stream and at least one environmental information signal. A combination of the power supply level adjustment signal and the average desired transmit power or a gain control signal and an altered version of the power supply level adjustment signal is used to generate a variable power supply signal that is provided to an output amplifier block for sufficiently generating outgoing wireless device radio signals while reducing power loss in the output amplifier block.
    Type: Application
    Filed: September 5, 2012
    Publication date: December 27, 2012
    Applicant: RESEARCH IN MOTION LIMITED
    Inventors: Wen-Yen CHAN, Nasserullah KHAN, Qingzhong JIAO, Xin JIN, Michael HABICHER, Nagula Tharma SANGARY
  • Patent number: 8295397
    Abstract: Various embodiments described herein relate to a power management block and an amplification block used in the transmitter of a communication subsystem. The power management block provides improved control for the gain control signal provided to a pre-amplifier and the supply voltage provided to a power amplifier which are both in the amplification block. The power expended by the power amplifier is optimized by employing a continuous control method in which one or more feedback loops are employed to take into account various characteristics of the transmitter components and control values.
    Type: Grant
    Filed: May 21, 2010
    Date of Patent: October 23, 2012
    Assignee: Research In Motion Limited
    Inventors: Wen-Yen Chan, Nasserullah Khan
  • Patent number: 8295792
    Abstract: Various embodiments described herein relate to a power management block and an amplification block used in the transmitter of a communication subsystem. The power management block provides improved control for the gain control signal provided to a pre-amplifier and the supply voltage provided to a power amplifier which are both in the amplification block. The power expended by the power amplifier is optimized by employing a continuous control method in which one or more feedback loops are employed to take into account various characteristics of the transmitter components and control values.
    Type: Grant
    Filed: January 17, 2012
    Date of Patent: October 23, 2012
    Assignee: Research In Motion Limited
    Inventors: Wen-Yen Chan, Nasserullah Khan
  • Patent number: 8295403
    Abstract: A communications subsystem for a wireless device for correcting errors in a reference frequency signal. The communications subsystem comprises a frequency generator for generating the reference frequency signal and a closed loop reference frequency correction module that generates a reference frequency adjustment signal for correcting the reference frequency signal when the communications subsystem operates in closed loop mode. The subsystem further includes an open loop frequency correction means that that samples values of the reference frequency adjustment signal during the closed loop mode and generates a frequency correction signal for correcting the reference frequency signal when the communications subsystem operates in a mode other than closed loop mode.
    Type: Grant
    Filed: January 30, 2009
    Date of Patent: October 23, 2012
    Assignee: Research In Motion Limited
    Inventors: Wen-Yen M. Chan, Xin Jin, Qingzhong Jiao, Nasserullah Khan, Nagula Tharma Sangary
  • Patent number: 8290085
    Abstract: A power management system and method for a wireless communication device generates an average desired transmit power signal based on at least one of a received signal strength indicator signal and a power control instruction signal from a base station. A power supply level adjustment signal is generated based on the data parameters of an outgoing data stream and at least one environmental information signal. A combination of the power supply level adjustment signal and the average desired transmit power or a gain control signal and an altered version of the power supply level adjustment signal is used to generate a variable power supply signal that is provided to an output amplifier block for sufficiently generating outgoing wireless device radio signals while reducing power loss in the output amplifier block.
    Type: Grant
    Filed: July 28, 2011
    Date of Patent: October 16, 2012
    Assignee: Research In Motion Limited
    Inventors: Wen-Yen Chan, Nasserullah Khan, Xin Jin, Nagula Tharma Sangary, Michael Franz Habicher, Qingzhong Jiao
  • Publication number: 20120220242
    Abstract: A stage is provided for a receiver of a wireless device. The stage comprises a matching network that separates amplified signals of interest received from an amplifier from amplified unwanted signals received from the amplifier in conjunction with additional downstream filters. The stage also comprises a signal path that comprises components for receiving and processing the amplified signals of interest, and a shunt path that comprises components for adjusting reflected energy sent back to the amplifier for limiting the output swing of the amplifier in a frequency band corresponding to the amplified unwanted signals.
    Type: Application
    Filed: May 3, 2012
    Publication date: August 30, 2012
    Applicant: RESEARCH IN MOTION LIMITED
    Inventors: Wen-Yen Chan, Nasserullah Khan
  • Patent number: 8190113
    Abstract: A stage is provided for a receiver of a wireless device. The stage comprises a matching network that separates amplified signals of interest received from an amplifier from amplified unwanted signals received from the amplifier in conjunction with additional downstream filters. The stage also comprises a signal path that comprises components for receiving and processing the amplified signals of interest, and a shunt path that comprises components for adjusting reflected energy sent back to the amplifier for limiting the output swing of the amplifier in a frequency band corresponding to the amplified unwanted signals.
    Type: Grant
    Filed: August 27, 2008
    Date of Patent: May 29, 2012
    Assignee: Research In Motion Limited
    Inventors: Wen-Yen Chan, Nasserullah Khan
  • Publication number: 20120122411
    Abstract: Various embodiments described herein relate to a power management block and an amplification block used in the transmitter of a communication subsystem. The power management block provides improved control for the gain control signal provided to a pre-amplifier and the supply voltage provided to a power amplifier which are both in the amplification block. The power expended by the power amplifier is optimized by employing a continuous control method in which one or more feedback loops are employed to take into account various characteristics of the transmitter components and control values.
    Type: Application
    Filed: January 17, 2012
    Publication date: May 17, 2012
    Applicant: RESEARCH IN MOTION LIMITED
    Inventors: Wen-Yen Chan, Nasserullah Khan
  • Patent number: 8160517
    Abstract: Various embodiments described herein relate to a power management block and an amplification block used in the transmitter of a communication subsystem. The power management block provides improved control for the gain control signal provided to a pre-amplifier and the supply voltage provided to a power amplifier which are both in the amplification block. The power expended by the power amplifier is optimized by employing a continuous control method in which one or more feedback loops are employed to take into account various characteristics of the transmitter components and control values.
    Type: Grant
    Filed: May 21, 2010
    Date of Patent: April 17, 2012
    Assignee: Research In Motion Limited
    Inventors: Wen-Yen Chan, Nasserullah Khan
  • Publication number: 20120021704
    Abstract: Various embodiments described herein relate to a power management block and one or more amplification blocks used in the transmitter of a communication subsystem. The power management block provides improved control for the gain control signal provided to a pre-amplifier and the supply voltage provided to a power amplifier, both of which are included in a selected one of the amplification blocks. The power expended by the power amplifier is optimized by employing a continuous control method in which one or more feedback loops are employed to take 1n into account various characteristics of the transmitter components and control values. Post power amplifier transmission power is detected for input into the one or more feedback loops executed in the power management block. A controller for the power amplifier is design to stabilize the system with respect to gain expansion in the power amplifier.
    Type: Application
    Filed: July 23, 2010
    Publication date: January 26, 2012
    Applicant: RESEARCH IN MOTION LIMITED
    Inventors: Wen-Yen Chan, Nasserullah Khan, Ian Ka Yin Chung, Hamza Mohaimeen Bari
  • Publication number: 20110319124
    Abstract: A power management system and method for a wireless communication device generates an average desired transmit power signal based on at least one of a received signal strength indicator signal and a power control instruction signal from a base station. A power supply level adjustment signal is generated based on the data parameters of an outgoing data stream and at least one environmental information signal. A combination of the power supply level adjustment signal and the average desired transmit power or a gain control signal and an altered version of the power supply level adjustment signal is used to generate a variable power supply signal that is provided to an output amplifier block for sufficiently generating outgoing wireless device radio signals while reducing power loss in the output amplifier block.
    Type: Application
    Filed: July 28, 2011
    Publication date: December 29, 2011
    Applicant: RESEARCH IN MOTION LIMITED
    Inventors: Wen-Yen Chan, Nasserullah Khan, Qingzhong Jiao, Xin Jin, Nagula Tharma Sangary, Michael Franz Habicher
  • Patent number: 8000409
    Abstract: A power management system and method for a wireless communication device generates an average desired transmit power signal based on at least one of a received signal strength indicator signal and a power control instruction signal from a base station. A power supply level adjustment signal is generated based on the data parameters of an outgoing data stream and at least one environmental information signal. A combination of the power supply level adjustment signal and the average desired transmit power or a gain control signal and an altered version of the power supply level adjustment signal is used to generate a variable power supply signal that is provided to an output amplifier block for sufficiently generating outgoing wireless device radio signals while reducing power loss in the output amplifier block.
    Type: Grant
    Filed: July 30, 2010
    Date of Patent: August 16, 2011
    Assignee: Research In Motion Limited
    Inventors: Wen-Yen Chan, Nasserullah Khan, Qingzhong Jiao, Xin Jin, Nagula Tharma Sangary, Michael Franz Habicher
  • Publication number: 20110130105
    Abstract: A transmitter for a mobile device utilizes at least one mapper in order to improve power efficiency while still meeting out of band spurious emissions and waveform quality requirements. An encoder and modulator generates an encoded and modulated transmit signal from an input signal. A digital to analog converter coupled to the encoder and modulator generates an analog representation of the encoded and modulated transmit signal. An amplifier stage coupled to the digital to analog converter amplifies the analog representation of the encoded and modulated transmit signal to generate a transmission signal. The transmitter further comprises an amplifier control block configured to generate an amplifier control signal for adjusting at least one parameter of the amplifier stage. At least one mapper is provided in the amplifier control block, used to determine the amplifier control signal based on a peak to average power ratio and an average transmit power of the transmission signal.
    Type: Application
    Filed: May 21, 2010
    Publication date: June 2, 2011
    Applicant: RESEARCH IN MOTION LIMITED
    Inventors: Wen-Yen Chan, Nasserullah Khan, Xin Jin, Qingzhong Jiao
  • Patent number: 7907920
    Abstract: Various embodiments described herein relate to a power management block and an amplification block used in the transmitter of a communication subsystem. The power management block provides improved control for the gain control signal provided to a pre-amplifier and the supply voltage provided to a power amplifier which are both in the amplification block. The power expended by the power amplifier is optimized by employing a continuous control method in which one or more feedback loops are employed to take into account various characteristics of the transmitter components and control values.
    Type: Grant
    Filed: June 14, 2007
    Date of Patent: March 15, 2011
    Assignee: Research In Motion Limited
    Inventors: Wen-Yen Chan, Nasserullah Khan
  • Patent number: 7873119
    Abstract: Various embodiments described herein relate to a power management block and an amplification block used in the transmitter of a communication subsystem. The power management block provides improved control for the gain control signal provided to a pre-amplifier and the supply voltage provided to a power amplifier which are both in the amplification block. The power expended by the power amplifier is optimized by employing a continuous control method in which one or more feedback loops are employed to take into account various characteristics of the transmitter components and control values.
    Type: Grant
    Filed: June 14, 2007
    Date of Patent: January 18, 2011
    Assignee: Research In Motion Limited
    Inventors: Wen-Yen Chan, Nasserullah Khan
  • Patent number: 7869776
    Abstract: A method and apparatus for regulating Tx power in a multi-rate mobile device transmitter containing signal dependent gain stages. A data rate and signal format indicator signal corresponding to the transmitted signal, and a desired reference power signal are fed to a mapper that outputs a calibration value based on the desired reference power level at the antenna. The calibration value controls the power amplifier gain characteristics in real time.
    Type: Grant
    Filed: June 3, 2009
    Date of Patent: January 11, 2011
    Assignee: Research In Motion Limited
    Inventors: Xin Jin, Nagula T. Sangary, Muhammad Khaledul Islam, Wen Zhao, Nasserullah Khan, Wen-Yen Chan, Qing Zhong Jiao
  • Publication number: 20100291887
    Abstract: A power management system and method for a wireless communication device generates an average desired transmit power signal based on at least one of a received signal strength indicator signal and a power control instruction signal from a base station. A power supply level adjustment signal is generated based on the data parameters of an outgoing data stream and at least one environmental information signal. A combination of the power supply level adjustment signal and the average desired transmit power or a gain control signal and an altered version of the power supply level adjustment signal is used to generate a variable power supply signal that is provided to an output amplifier block for sufficiently generating outgoing wireless device radio signals while reducing power loss in the output amplifier block.
    Type: Application
    Filed: July 30, 2010
    Publication date: November 18, 2010
    Applicant: RESEARCH IN MOTION LIMITED
    Inventors: Wen-Yen Chan, Nasserullah Khan, Qingzhong Jiao, Xin Jin, Nagula Tharma Sangary, Michael Franz Habicher
  • Publication number: 20100233978
    Abstract: Various embodiments described herein relate to a power management block and an amplification block used in the transmitter of a communication subsystem. The power management block provides improved control for the gain control signal provided to a pre-amplifier and the supply voltage provided to a power amplifier which are both in the amplification block. The power expended by the power amplifier is optimized by employing a continuous control method in which one or more feedback loops are employed to take into account various characteristics of the transmitter components and control values.
    Type: Application
    Filed: May 21, 2010
    Publication date: September 16, 2010
    Applicant: RESEARCH IN MOTION LIMITED
    Inventors: Wen-Yen Chan, Nasserullah Khan
  • Publication number: 20100227578
    Abstract: Various embodiments described herein relate to a power management block and an amplification block used in the transmitter of a communication subsystem. The power management block provides improved control for the gain control signal provided to a pre-amplifier and the supply voltage provided to a power amplifier which are both in the amplification block. The power expended by the power amplifier is optimized by employing a continuous control method in which one or more feedback loops are employed to take into account various characteristics of the transmitter components and control values.
    Type: Application
    Filed: May 21, 2010
    Publication date: September 9, 2010
    Applicant: RESEARCH IN MOTION LIMITED
    Inventors: Wen-Yen Chan, Nasserullah Khan