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).
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Patent number: 7787566Abstract: 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: GrantFiled: June 5, 2009Date of Patent: August 31, 2010Assignee: Research In Motion LimitedInventors: Wen-Yen M. Chan, Nasserullah Khan, Qingzhong Jiao, Nagula Tharma Sangary, Michael Franz Habicher, Xin Jin
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Publication number: 20090245419Abstract: 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: ApplicationFiled: June 5, 2009Publication date: October 1, 2009Applicant: RESEARCH IN MOTION LIMITEDInventors: Wen-Yen Chan, Nasserullah Khan, Qingzhong Jiao, Xin Jin, Nagula Tharma Sangary, Michael Franz Habicher
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Publication number: 20090239487Abstract: 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: ApplicationFiled: June 3, 2009Publication date: September 24, 2009Applicant: RESEARCH IN MOTION LIMITEDInventors: Xin Jin, Nagula T. Sangary, M. Khaledul Islam, Wen Zhao, Nasserullah Khan, Wen-Yen Chan, Qing Zhong Jiao
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Patent number: 7558540Abstract: 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: GrantFiled: November 4, 2003Date of Patent: July 7, 2009Assignee: Research In Motion LimitedInventors: Xin Jin, Nagula T. Sangary, M. Khaledul Islam, Wen Zhao, Nasserullah Khan, Wen-Yen Chan, Qing Zhong Jiao
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Patent number: 7551689Abstract: 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: GrantFiled: February 4, 2008Date of Patent: June 23, 2009Assignee: Research In Motion LimitedInventors: Wen-Yen M. Chan, Nasserullah Khan, Qingzhong Jiao, Nagula Tharma Sangary, Michael Franz Habicher, Xin Jin
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Publication number: 20090135956Abstract: 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: ApplicationFiled: January 30, 2009Publication date: May 28, 2009Applicant: RESEARCH IN MOTION LIMITEDInventors: Wen-Yen Chan, Xin Jin, Qingzhong Jiao, Nasserullah Khan, Nagula Tharma Sangary
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Patent number: 7508888Abstract: 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: GrantFiled: April 28, 2005Date of Patent: March 24, 2009Assignee: Research In Motion LimitedInventors: Wen-Yen Chan, Xin Jin, Qingzhong Jiao, Nasserullah Khan, Nagula Tharma Sangary
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Publication number: 20080318542Abstract: 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: ApplicationFiled: August 27, 2008Publication date: December 25, 2008Applicant: RESEARCH IN MOTION LIMITEDInventors: Wen-Yen Chan, Nasserullah Khan
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Patent number: 7433666Abstract: A pre-processing stage is provided for a receiver of a wireless device. The pre-processing stage includes an amplifier that receives signals of interest and unwanted signals and produces amplified signals of interest and amplified unwanted signals, and a matching network that separates the amplified signals of interest from the amplified unwanted signals in conjunction with additional downstream filters. The preprocessing stage also includes a signal path that includes components for receiving and pre-processing the amplified signals of interest, and a shunt path that includes 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: GrantFiled: May 4, 2005Date of Patent: October 7, 2008Assignee: Research In Motion LimitedInventors: Wen-Yen Chan, Nasserullah Khan
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Publication number: 20080118001Abstract: 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: ApplicationFiled: February 4, 2008Publication date: May 22, 2008Applicant: RESEARCH IN MOTION LIMITEDInventors: Wen-Yen Chan, Nasserullah Khan, Qingzhong Jiao, Xin Jin, Nagula Sangary, Michael Habicher
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Patent number: 7333563Abstract: 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: GrantFiled: February 20, 2004Date of Patent: February 19, 2008Assignee: Research in Motion LimitedInventors: Wen-Yen Chan, Nasserullah Khan, Qingzhong Jiao, Xin Jin, Nagula Tharma Sangary, Michael Franz Habicher
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Publication number: 20070291872Abstract: 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: ApplicationFiled: June 14, 2007Publication date: December 20, 2007Applicant: RESEARCH IN MOTION LIMITEDInventors: Wen-Yen Chan, Nasserullah Khan
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Publication number: 20070291718Abstract: 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: ApplicationFiled: June 14, 2007Publication date: December 20, 2007Applicant: RESEARCH IN MOTION LIMITEDInventors: Wen-Yen Chan, Nasserullah Khan
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Publication number: 20060154635Abstract: A pre-processing stage is provided for a receiver of a wireless device. The pre-processing stage includes an amplifier that receives signals of interest and unwanted signals and produces amplified signals of interest and amplified unwanted signals, and a matching network that separates the amplified signals of interest from the amplified unwanted signals in conjunction with additional downstream filters. The preprocessing stage also includes a signal path that includes components for receiving and pre-processing the amplified signals of interest, and a shunt path that includes 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: ApplicationFiled: May 4, 2005Publication date: July 13, 2006Applicant: Research in Motion LimitedInventors: Wen-Yen Chan, Nasserullah Khan
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Publication number: 20060104394Abstract: 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: ApplicationFiled: April 28, 2005Publication date: May 18, 2006Applicant: Research in Motion LimitedInventors: Wen-Yen Chan, Xin Jin, Qingzhong Jiao, Nasserullah Khan, Nagula Sangary
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Publication number: 20050186923Abstract: 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: ApplicationFiled: February 20, 2004Publication date: August 25, 2005Applicant: Research In Motion LimitedInventors: Wen-Yen Chen, Nasserullah Khan, Qingzhong Jiao, Xin Jin, Nagula Sangary, Michael Habicher
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Publication number: 20040147235Abstract: 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: ApplicationFiled: November 4, 2003Publication date: July 29, 2004Inventors: Xin Jin, Nagula T. Sangary, M. Khaledul Islam, Wen Zhao, Nasserullah Khan, Wen-Yen Chan, Qing Zhong Jiao
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Patent number: 6483388Abstract: A direct digital frequency synthesizer and a hybrid frequency synthesizer combining the direct digital frequency synthesizer and a phase locked loop is provided. The direct digital frequency synthesizer includes a phase accumulator that is configured to generate a discrete phase signal. Spurious phase modulation in the discrete phase signal is reduced by a noise shaper, and the output of the noise shaper is then used to address a phase-to-amplitude translator. The phase-to-amplitude translator generates a discrete waveform which is converted to a continuous waveform by a digital to analog converter. The hybrid frequency synthesizer uses a mixer to combine a reference frequency generated by a reference source and a DDFS output signal generated by a direct digital frequency synthesizer. The output from the mixer is then coupled to the input of a phase locked loop which multiplies the mixer output to generate the frequency synthesizer output.Type: GrantFiled: May 30, 2001Date of Patent: November 19, 2002Assignee: Research In Motion LimitedInventor: Nasserullah Khan
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Publication number: 20020008588Abstract: A direct digital frequency synthesizer and a hybrid frequency synthesizer combining the direct digital frequency synthesizer and a phase locked loop is provided. The direct digital frequency synthesizer includes a phase accumulator that is configured to generate a discrete phase signal. Spurious phase modulation in the discrete phase signal is reduced by a noise shaper, and the output of the noise shaper is then used to address a phase-to-amplitude translator. The phase-to-amplitude translator generates a discrete waveform which is converted to a continuous waveform by a digital to analog converter. The hybrid frequency synthesizer uses a mixer to combine a reference frequency generated by a reference source and a DDFS output signal generated by a direct digital frequency synthesizer. The output from the mixer is then coupled to the input of a phase locked loop which multiplies the mixer output to generate the frequency synthesizer output.Type: ApplicationFiled: May 30, 2001Publication date: January 24, 2002Inventor: Nasserullah Khan