Patents by Inventor Seyfollah Bazarjani

Seyfollah Bazarjani 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: 9425747
    Abstract: A system and method of improving the efficiency in the power consumption of an audio system. In essence, the technique is to adjust the power delivered from the power supply to the analog section, such as the power amplifier, in response to the volume level indicated by the volume control module and/or in response to the detected characteristic of the input audio signal. Thus, in this manner, the analog section is operated in a manner that is related to the level of the signal it is processing. Additionally, the system and method also relate to a technique of adjusting the dynamic ranges of the digital signal and the analog signal to improve the overall dynamic range of the system without needing to consume additional power.
    Type: Grant
    Filed: March 3, 2008
    Date of Patent: August 23, 2016
    Assignee: QUALCOMM Incorporated
    Inventors: Seyfollah Bazarjani, Guoqing Miao, Joseph R. Fitzgerald, Prajakt V. Kulkarni, Justin Joseph Rosen Gagne, Gene H. McAllister, Jeffrey Hinrichs, Jan Paul van der Wagt
  • Patent number: 8958575
    Abstract: A multi-mode amplifier with configurable DC-coupled or AC-coupled output is described. In one design, the multi-mode amplifier includes an amplifier and at least one DC level shifting circuit. The amplifier receives and amplifies an input signal and provides an output signal that is suitable for DC coupling to a load in a DC-coupled mode and for AC coupling to the load in an AC-coupled mode. The at least one DC level shifting circuit performs DC level shifting for at least one (e.g., input and/or output) common-mode voltage of the amplifier and is controlled based on whether the amplifier is operating in the DC-coupled or AC-coupled mode. The amplifier operates between VDD and VNEG supplies in the DC-coupled mode and between VDD and VSS supplies in the AC-coupled mode. The amplifier may include at least one gain stage, an internal DC level shifting circuit, and an output stage.
    Type: Grant
    Filed: February 20, 2008
    Date of Patent: February 17, 2015
    Assignee: QUALCOMM Incorporated
    Inventors: Uma Chilakapati, Anurag Pulincherry, Seyfollah Bazarjani
  • Patent number: 8503695
    Abstract: A digital offset is combined with an audio signal in the digital domain to cancel an output offset caused by one or more analog components processing the same audio signal. In this manner, the offset at the output of the audio signal path (e.g., at a power amplifier output) is reduced or eliminated. Consequently, audible artifacts, such as click-and-pop artifacts, can be reduced or eliminated. In audio devices operating in ground-referenced capless mode, power consumption is reduced because of reduced or eliminated direct current (DC) leakage current through speakers or headsets of such audio devices. In some circumstances, the digital offset in the digital domain may be applied at substantially all times of operation of the audio signal path.
    Type: Grant
    Filed: September 25, 2008
    Date of Patent: August 6, 2013
    Assignee: QUALCOMM Incorporated
    Inventors: Uma Chilakapati, Seyfollah Bazarjani, Joseph Fitzgerald, Guoqing Miao, Hui-Ya Nelson, Khalid Sidiqi, Jeffrey Hinrichs
  • Patent number: 8238855
    Abstract: The present invention encompasses a mobile station comprising a transmitter for transmitting outgoing signals from the mobile station and a receiver for receiving incoming signals, the receiver coupled to the transmitter and having N subreceivers, where N is an integer greater than one and each of the N subreceivers may independently be tuned to a desired frequency.
    Type: Grant
    Filed: November 1, 2006
    Date of Patent: August 7, 2012
    Assignee: QUALCOMM Incorporated
    Inventors: Tao Chen, Seyfollah Bazarjani, Edward G. Tiedemann, Jr.
  • Patent number: 8189802
    Abstract: An improved power amplifier system is provided. The power amplifier system includes a programmable digital filter and a power amplifier, each responsive to a plurality of frequency response settings and switching frequency settings, respectively. Each frequency response setting and switching frequency setting is adaptively selected by a processor device to match a bandwidth of an incoming audio signal. The processor device identifies the current bandwidth of an incoming audio signal and adaptively selects a switching rate setting and a frequency response setting based on the current bandwidth. The frequency response setting is selected so as to reduce noise fold over in the power amplifier for a corresponding bandwidth, sampling rate setting, and switching frequency setting.
    Type: Grant
    Filed: March 19, 2009
    Date of Patent: May 29, 2012
    Assignee: Qualcomm Incorporated
    Inventors: Guoqing Miao, Matt Sienko, Seyfollah Bazarjani
  • Patent number: 7929714
    Abstract: An integrated audio transducer with associated signal processing electronics is disclosed. A silicon audio transducer, such as a MEMS microphone or speaker, can be integrated with audio processing electronics in a single package. The audio processing electronics can be configured using control signals. The audio processing electronics can provide a single line serial data interface and a single line control interface. The audio transducers can be integrated with associated processing electronics. A silicon microphone can be integrated with an Analog to Digital Converter (ADC). The ADC output can be a single line serial interface. The ADC can be configured using a single line serial control interface. A speaker may be integrated with a Digital to Analog Converter (DAC). Audio transducers can also be integrated with more complex processing electronics. Audio processing parameters such as gain, dynamic range, and filter characteristics may be configured using the serial interface.
    Type: Grant
    Filed: August 11, 2004
    Date of Patent: April 19, 2011
    Assignee: QUALCOMM Incorporated
    Inventors: Seyfollah Bazarjani, Louis D. Oliveira
  • Patent number: 7859340
    Abstract: Complimentary Metal-Oxide-Semiconductor (CMOS) circuits made with core transistors are capable of reliable operation from an IO power supply with voltage that exceeds the reliability limit of the transistors. In embodiments, biasing of an operational amplifier is changed in part to a fixed voltage corresponding to the reliability limit. In embodiments, switched capacitor networks are made with one or more amplifiers and switches including core transistors, but without exposing the core transistors to voltages in excess of their reliability limit. In embodiments, operational transconductance amplifiers (OTAs) include core transistors and operate from IO power supplies. Level shifters for shifting the levels of a power down signal may be used to avoid excessive voltage stress of the OTAs' core transistors during turn-off. Non-level shifting means may be used to clamp output voltages and selected internal voltages of the OTAs, also avoiding excessive voltage stress of the core transistors during turn-off.
    Type: Grant
    Filed: March 26, 2008
    Date of Patent: December 28, 2010
    Assignee: QUALCOMM Incorporated
    Inventors: Guoqing Miao, Seyfollah Bazarjani
  • Publication number: 20100239102
    Abstract: An improved power amplifier system is provided. The power amplifier system includes a programmable digital filter and a power amplifier, each responsive to a plurality of frequency response settings and switching frequency settings, respectively. Each frequency response setting and switching frequency setting is adaptively selected by a processor device to match a bandwidth of an incoming audio signal. The processor device identifies the current bandwidth of an incoming audio signal and adaptively selects a switching rate setting and a frequency response setting based on the current bandwidth. The frequency response setting is selected so as to reduce noise fold over in the power amplifier for a corresponding bandwidth, sampling rate setting, and switching frequency setting.
    Type: Application
    Filed: March 19, 2009
    Publication date: September 23, 2010
    Applicant: QUALCOMM Incorporated
    Inventors: Guoqing Miao, Matt Sienko, Seyfollah Bazarjani
  • Patent number: 7750837
    Abstract: Techniques for adaptively generating bias current for a switched-capacitor circuit are described. The switched-capacitor circuit charges and discharges at least one switching capacitor at a sampling rate and may be a ?? ADC that digitizes an analog signal at the sampling rate and provides digital samples. The switched-capacitor circuit may support multiple modes associated with different sampling rates. A bias circuit generates a bias current for the switched-capacitor circuit to be proportional to the sampling rate for a selected mode, to provide a bandwidth proportional to the sampling rate for an operational transconductance amplifier (OTA) within the switched-capacitor circuit, and to track changes in the switching capacitor(s) due to variations in integrated circuit (IC) process and temperature. The settling time of the switched-capacitor circuit may track with the multiple modes and across IC process and temperature variations.
    Type: Grant
    Filed: August 1, 2008
    Date of Patent: July 6, 2010
    Assignee: QUALCOMM Incorporated
    Inventors: Chuanyang Wang, Xiaohong Quan, Seyfollah Bazarjani
  • Publication number: 20100026542
    Abstract: Techniques for adaptively generating bias current for a switched-capacitor circuit are described. The switched-capacitor circuit charges and discharges at least one switching capacitor at a sampling rate and may be a ?? ADC that digitizes an analog signal at the sampling rate and provides digital samples. The switched-capacitor circuit may support multiple modes associated with different sampling rates. A bias circuit generates a bias current for the switched-capacitor circuit to be proportional to the sampling rate for a selected mode, to provide a bandwidth proportional to the sampling rate for an operational transconductance amplifier (OTA) within the switched-capacitor circuit, and to track changes in the switching capacitor(s) due to variations in integrated circuit (IC) process and temperature. The settling time of the switched-capacitor circuit may track with the multiple modes and across IC process and temperature variations.
    Type: Application
    Filed: August 1, 2008
    Publication date: February 4, 2010
    Applicant: QUALCOMM Incorporated
    Inventors: Chuanyang Wang, Xiaohong Quan, Seyfollah Bazarjani
  • Publication number: 20090220110
    Abstract: A system and method of improving the efficiency in the power consumption of an audio system. In essence, the technique is to adjust the power delivered from the power supply to the analog section, such as the power amplifier, in response to the volume level indicated by the volume control module and/or in response to the detected characteristic of the input audio signal. Thus, in this manner, the analog section is operated in a manner that is related to the level of the signal it is processing. Additionally, the system and method also relate to a technique of adjusting the dynamic ranges of the digital signal and the analog signal to improve the overall dynamic range of the system without needing to consume additional power.
    Type: Application
    Filed: March 3, 2008
    Publication date: September 3, 2009
    Applicant: QUALCOMM INCORPORATED
    Inventors: Seyfollah Bazarjani, Guoqing Miao, Joseph R. Fitzgerald, Prajakt V. Kulkarni, Justin Joseph Rosen Gagne, Gene H. McAllister, Jeffrey Hinrichs, Jan Paul van der Wagt
  • Publication number: 20090103750
    Abstract: A digital offset is combined with an audio signal in the digital domain to cancel an output offset caused by one or more analog components processing the same audio signal. In this manner, the offset at the output of the audio signal path (e.g., at a power amplifier output) is reduced or eliminated. Consequently, audible artifacts, such as click-and-pop artifacts, can be reduced or eliminated. In audio devices operating in ground-referenced capless mode, power consumption is reduced because of reduced or eliminated direct current (DC) leakage current through speakers or headsets of such audio devices. In some circumstances, the digital offset in the digital domain may be applied at substantially all times of operation of the audio signal path.
    Type: Application
    Filed: September 25, 2008
    Publication date: April 23, 2009
    Applicant: QUALCOMM Incorporated
    Inventors: Uma Chilakapati, Seyfollah Bazarjani, Joseph Fitzgerald, Guoqing Miao, Hui-Ya Nelson, Khalid J. Sidiqi, Jeffrey M. Hinrichs
  • Publication number: 20090002075
    Abstract: A multi-mode amplifier with configurable DC-coupled or AC-coupled output is described. In one design, the multi-mode amplifier includes an amplifier and at least one DC level shifting circuit. The amplifier receives and amplifies an input signal and provides an output signal that is suitable for DC coupling to a load in a DC-coupled mode and for AC coupling to the load in an AC-coupled mode. The at least one DC level shifting circuit performs DC level shifting for at least one (e.g., input and/or output) common-mode voltage of the amplifier and is controlled based on whether the amplifier is operating in the DC-coupled or AC-coupled mode. The amplifier operates between VDD and VNEG supplies in the DC-coupled mode and between VDD and VSS supplies in the AC-coupled mode. The amplifier may include at least one gain stage, an internal DC level shifting circuit, and an output stage.
    Type: Application
    Filed: February 20, 2008
    Publication date: January 1, 2009
    Applicant: QUALCOMM INCORPORATED
    Inventors: Uma Chilakapati, Anurag Pulincherry, Seyfollah Bazarjani
  • Publication number: 20080252376
    Abstract: Complimentary Metal-Oxide-Semiconductor (CMOS) circuits made with core transistors are capable of reliable operation from an IO power supply with voltage that exceeds the reliability limit of the transistors. In embodiments, biasing of an operational amplifier is changed in part to a fixed voltage corresponding to the reliability limit. In embodiments, switched capacitor networks are made with one or more amplifiers and switches including core transistors, but without exposing the core transistors to voltages in excess of their reliability limit. In embodiments, operational transconductance amplifiers (OTAs) include core transistors and operate from IO power supplies. Level shifters for shifting the levels of a power down signal may be used to avoid excessive voltage stress of the OTAs' core transistors during turn-off. Non-level shifting means may be used to clamp output voltages and selected internal voltages of the OTAs, also avoiding excessive voltage stress of the core transistors during turn-off.
    Type: Application
    Filed: March 26, 2008
    Publication date: October 16, 2008
    Applicant: QUALCOMM INCORPORATED
    Inventors: Guoqing Miao, Seyfollah Bazarjani
  • Patent number: 7415088
    Abstract: Techniques for processing incoming signals conforming to a plurality of standards or communication formats with a single baseband receive section are disclosed. In one aspect, a plurality of analog processing components are adjusted in response to a format select signal, set according to one of a plurality of supported formats or standards. In another aspect, the operating mode of an A/D converter is tuned in response to the format select signal. In yet another aspect, the response characteristics of a jammer filter are tuned in response to the format select signal. In yet another aspect, the adjustment of the plurality of analog processing components is carried out by varying the frequency of a sample clock in response to the format select signal. Various other aspects are also presented. These aspects have the benefit of allowing a single baseband receive section to be deployed to process analog signals conforming to a plurality of communications standards or formats, in a power and area efficient manner.
    Type: Grant
    Filed: April 15, 2002
    Date of Patent: August 19, 2008
    Assignee: QUALCOMM Incorporated
    Inventors: Vincenzo Filip Andre Peluso, Seyfollah Bazarjani, Peter Jivan Shah, James Jaffee
  • Patent number: 7406339
    Abstract: An on-chip detection circuit automatically detects when an external switch has been activated. When the device is initialized, the detection circuit measures the operating current and coverts the information into an analog voltage. The analog voltage is then processed through an on-chip analog-to-digital converter and the digitized result is stored as a reference value. To sense the open and close action of the off-chip mechanical switch, the device then takes a sample of the operating current periodically, digitizes this information and compares the sampled value to the reference value. A change in value larger than some predetermined level indicates the external switch has been activated.
    Type: Grant
    Filed: August 5, 2002
    Date of Patent: July 29, 2008
    Assignee: QUALCOMM Incorporated
    Inventors: Seyfollah Bazarjani, Sean Wang, Vincenzo Peluso, Louis Dominic Oliveira
  • Publication number: 20070060086
    Abstract: The present invention encompasses a mobile station comprising a transmitter for transmitting outgoing signals from the mobile station and a receiver for receiving incoming signals, the receiver coupled to the transmitter and having N subreceivers, where N is an integer greater than one and each of the N subreceivers may independently be tuned to a desired frequency.
    Type: Application
    Filed: November 1, 2006
    Publication date: March 15, 2007
    Applicant: QUALCOMM, INC.
    Inventors: Tao Chen, Seyfollah Bazarjani, Edward Tiedemann
  • Patent number: 7136648
    Abstract: The present invention encompasses a mobile station comprising a transmitter for transmitting outgoing signals from the mobile station and a receiver for receiving incoming signals, the receiver coupled to the transmitter and having N sub receivers, where N is an integer greater than one and each of the N sub receivers may independently be tuned to a desired frequency.
    Type: Grant
    Filed: June 6, 2003
    Date of Patent: November 14, 2006
    Assignee: Qualcomm, Inc.
    Inventors: Tao Chen, Seyfollah Bazarjani, Edward G. Tiedemann, Jr.
  • Publication number: 20060034472
    Abstract: An integrated audio transducer with associated signal processing electronics is disclosed. A silicon audio transducer, such as a MEMS microphone or speaker, can be integrated with audio processing electronics in a single package. The audio processing electronics can be configured using control signals. The audio processing electronics can provide a single line serial data interface and a single line control interface. The audio transducers can be integrated with associated processing electronics. A silicon microphone can be integrated with an Analog to Digital Converter (ADC). The ADC output can be a single line serial interface. The ADC can be configured using a single line serial control interface. A speaker may be integrated with a Digital to Analog Converter (DAC). Audio transducers can also be integrated with more complex processing electronics. Audio processing parameters such as gain, dynamic range, and filter characteristics may be configured using the serial interface.
    Type: Application
    Filed: August 11, 2004
    Publication date: February 16, 2006
    Inventors: Seyfollah Bazarjani, Louis Oliveira
  • Patent number: 6956515
    Abstract: A digital to analog converter augmented with Direct Charge Transfer (DCT) techniques. A digital to analog converter augmented with DCT and CDS techniques. A digital to analog converter augmented with Postfilter Droop Compensation.
    Type: Grant
    Filed: June 17, 2003
    Date of Patent: October 18, 2005
    Assignee: QUALCOMM, Incorporated
    Inventors: Edward A. Keehr, Sean Wang, Seyfollah Bazarjani