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).
-
Patent number: 9276545Abstract: 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 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: GrantFiled: November 11, 2013Date of Patent: March 1, 2016Assignee: BLACKBERRY LIMITEDInventors: Wen-Yen Chan, Nasserullah Khan, Ian Ka Yin Chung, Hamza Mohaimeen Bari
-
Patent number: 9014646Abstract: An electronic device may include a mobile wireless communications device having a first housing, a spatial diversity wireless transceiver carried by the first housing, and a first antenna carried by the first housing and coupled to the spatial diversity wireless transceiver. The electronic device may include an external antenna device having a second housing, and a second antenna carried thereby and configured to be coupled to the spatial diversity wireless transceiver. The spatial diversity wireless transceiver may be configured to selectively operate one of the first antenna and the second antenna to provide spatial diversity.Type: GrantFiled: December 23, 2013Date of Patent: April 21, 2015Assignee: BlackBerry LimitedInventor: Nasserullah Khan
-
Patent number: 8965321Abstract: 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: GrantFiled: April 26, 2013Date of Patent: February 24, 2015Assignee: BlackBerry LimitedInventors: Wen-Yen Chan, Nasserullah Khan
-
Patent number: 8873675Abstract: A transmitter for a mobile device utilizes at least one mapper 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 and a DAC then generates an analog representation of the encoded and modulated transmit signal. An amplifier stage coupled to the DAC amplifies the analog representation of the encoded and modulated transmit signal to generate a transmission signal. The transmitter further comprises an amplifier control block that generates an amplifier control signal to adjust at least one parameter of the amplifier stage. The amplifier control block includes at least one mapper to determine the amplifier control signal based on a peak to average power ratio and an average transmit power of the transmission signal. Environmental and operating conditions of the transmitter may be accounted for in the mappers.Type: GrantFiled: March 14, 2013Date of Patent: October 28, 2014Assignee: BlackBerry LimitedInventors: Wen-Yen Chan, Qingzhong Jiao, Xin Jin, Nasserullah Khan
-
Patent number: 8761305Abstract: 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: GrantFiled: September 12, 2012Date of Patent: June 24, 2014Assignee: BlackBerry LimitedInventors: Wen-Yen Chan, Nasserullah Khan
-
Publication number: 20140106682Abstract: An electronic device may include a mobile wireless communications device having a first housing, a spatial diversity wireless transceiver carried by the first housing, and a first antenna carried by the first housing and coupled to the spatial diversity wireless transceiver. The electronic device may include an external antenna device having a second housing, and a second antenna carried thereby and configured to be coupled to the spatial diversity wireless transceiver. The spatial diversity wireless transceiver may be configured to selectively operate one of the first antenna and the second antenna to provide spatial diversity.Type: ApplicationFiled: December 23, 2013Publication date: April 17, 2014Applicant: BLACKBERRY LIMITEDInventor: NASSERULLAH KHAN
-
Patent number: 8670503Abstract: 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: September 5, 2012Date of Patent: March 11, 2014Assignee: BlackBerry LimitedInventors: Wen-Yen Chan, Nasserullah Khan, Michael Habicher, Nagula Tharma Sangary, Qingzhong Jiao, Xin Jin
-
Publication number: 20140065990Abstract: 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 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: ApplicationFiled: November 11, 2013Publication date: March 6, 2014Applicant: BlackBerry LimitedInventors: Wen-Yen Chan, Nasserullah Khan, Ian Ka Yin Chung, Hamza Mohaimeen Bari
-
Patent number: 8655288Abstract: An electronic device may include a mobile wireless communications device having a first housing, a spatial diversity wireless transceiver carried by the first housing, and a first antenna carried by the first housing and coupled to the spatial diversity wireless transceiver. The electronic device may include an external antenna device having a second housing, and a second antenna carried thereby and configured to be coupled to the spatial diversity wireless transceiver. The spatial diversity wireless transceiver may be configured to selectively operate one of the first antenna and the second antenna to provide spatial diversity.Type: GrantFiled: January 27, 2012Date of Patent: February 18, 2014Assignee: BlackBerry LimitedInventor: Nasserullah Khan
-
Patent number: 8620238Abstract: 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 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: GrantFiled: July 23, 2010Date of Patent: December 31, 2013Assignee: BlackBerry LimitedInventors: Wen-Yen Chan, Nasserullah Khan, Ian Ka Yin Chung, Hamza Mohaimeen Bari
-
Patent number: 8606199Abstract: 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: GrantFiled: September 12, 2012Date of Patent: December 10, 2013Assignee: BlackBerry LimitedInventors: Wen-Yen Chan, Nasserullah Khan
-
Publication number: 20130273863Abstract: A transmitter for a mobile device utilizes at least one mapper 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 and a DAC then generates an analog representation of the encoded and modulated transmit signal. An amplifier stage coupled to the DAC amplifies the analog representation of the encoded and modulated transmit signal to generate a transmission signal. The transmitter further comprises an amplifier control block that generates an amplifier control signal to adjust at least one parameter of the amplifier stage. The amplifier control block includes at least one mapper to determine the amplifier control signal based on a peak to average power ratio and an average transmit power of the transmission signal. Environmental and operating conditions of the transmitter may be accounted for in the mappers.Type: ApplicationFiled: March 14, 2013Publication date: October 17, 2013Inventors: Wen-Yen CHAN, Qingzhong JIAO, Xin JIN, Nasserullah KHAN
-
Publication number: 20130244607Abstract: 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: April 26, 2013Publication date: September 19, 2013Applicant: RESEARCH IN MOTION LIMITEDInventors: Wen-Yen Chan, Nasserullah Khan
-
Publication number: 20130196710Abstract: An electronic device may include a mobile wireless communications device having a first housing, a spatial diversity wireless transceiver carried by the first housing, and a first antenna carried by the first housing and coupled to the spatial diversity wireless transceiver. The electronic device may include an external antenna device having a second housing, and a second antenna carried thereby and configured to be coupled to the spatial diversity wireless transceiver. The spatial diversity wireless transceiver may be configured to selectively operate one of the first antenna and the second antenna to provide spatial diversity.Type: ApplicationFiled: January 27, 2012Publication date: August 1, 2013Applicant: Research In Motion LimitedInventor: Nasserullah KHAN
-
Patent number: 8477878Abstract: 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: September 13, 2012Date of Patent: July 2, 2013Assignee: Research In Motion LimitedInventors: Wen-Yen Chan, Nasserullah Khan, Nagula Tharma Sangary, Qingzhong Jiao, Xin Jin
-
Publication number: 20130149978Abstract: 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: September 12, 2012Publication date: June 13, 2013Applicant: RESEARCH IN MOTION LIMITEDInventors: Wen-Yen Chan, Nasserullah Khan
-
Patent number: 8447257Abstract: 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: GrantFiled: May 3, 2012Date of Patent: May 21, 2013Assignee: Research In Motion LimitedInventors: Wen-Yen Chan, Nasserullah Khan
-
Patent number: 8428181Abstract: 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: GrantFiled: May 21, 2010Date of Patent: April 23, 2013Assignee: Research In Motion LimitedInventors: Wen-Yen Chan, Nasserullah Khan, Xin Jin, Qingzhong Jiao
-
Publication number: 20130016800Abstract: 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: September 13, 2012Publication date: January 17, 2013Applicant: RESEARCH IN MOTION LIMITEDInventors: Wen-Yen CHAN, Xin JIN, Qingzhong JIAO, Nasserullah KHAN, Nagula Tharma SANGARY
-
Publication number: 20130012147Abstract: 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: September 12, 2012Publication date: January 10, 2013Applicant: RESEARCH IN MOTION LIMITEDInventors: Wen-Yen Chan, Nasserullah Khan