Patents by Inventor G. Diwakar Vishakhadatta
G. Diwakar Vishakhadatta 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: 8948708Abstract: Radio-frequency (RF) apparatus includes receiver analog circuitry that receives an RF signal and provides at least one digital signal to receiver digital circuitry that functions in cooperation with the receiver analog circuitry. The receiver analog circuitry and the receiver digital circuitry are partitioned so that interference effects between the receiver analog circuitry and the receiver digital circuitry tend to be reduced.Type: GrantFiled: May 21, 2014Date of Patent: February 3, 2015Assignee: Silicon Laboratories Inc.Inventors: Donald A. Kerth, Richard T. Behrens, Jeffrey W. Scott, G. Diwakar Vishakhadatta, G. Tyson Tuttle, Vishnu Srinivasan
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Patent number: 8843080Abstract: Radio-frequency (RF) apparatus includes receiver analog circuitry that receives an RF signal and provides at least one digital signal to receiver digital circuitry that functions in cooperation with the receiver analog circuitry. The receiver analog circuitry and the receiver digital circuitry are partitioned so that interference effects between the receiver analog circuitry and the receiver digital circuitry tend to be reduced.Type: GrantFiled: December 31, 2012Date of Patent: September 23, 2014Assignee: Silicon Laboratories Inc.Inventors: Donald Kerth, Richard Behrens, Jeffrey Scott, G. Diwakar Vishakhadatta, G. Tyson Tuttle, Vishnu Srinivasan
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Publication number: 20140256279Abstract: Radio-frequency (RF) apparatus includes receiver analog circuitry that receives an RF signal and provides at least one digital signal to receiver digital circuitry that functions in cooperation with the receiver analog circuitry. The receiver analog circuitry and the receiver digital circuitry are partitioned so that interference effects between the receiver analog circuitry and the receiver digital circuitry tend to be reduced.Type: ApplicationFiled: May 21, 2014Publication date: September 11, 2014Applicant: Silicon Laboratories Inc.Inventors: Donald A. Kerth, Richard T. Behrens, Jeffrey W. Scott, G. Diwakar Vishakhadatta, G. Tyson Tuttle, Vishnu Srinivasan
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Patent number: 8682275Abstract: A converter in a radio-frequency (RF) apparatus includes a feedback circuitry. The feedback circuitry has a shielded input and a shielded output. The shielded input and the shielded output of the feedback circuitry tend to reduce interference in the converter.Type: GrantFiled: June 30, 2010Date of Patent: March 25, 2014Assignee: Silicon Laboratories Inc.Inventors: Donald A. Kerth, G. Diwakar Vishakhadatta
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Patent number: 8478921Abstract: A communication apparatus includes a radio frequency circuit that operates on a radio frequency signal and a digital processing circuit coupled to the radio frequency circuit. The digital processing circuit includes a plurality of bus masters coupled to a shared bus. A bus arbiter is provided for arbitrating between requests to access the bus by a first bus master and one or more other bus masters. Accesses by the one or more other bus masters to the bus are restricted in response to a signal indicative of a change in a mode of operation of the RF circuit. In one particular implementation, a communication apparatus employs time domain isolation wherein the digital processing circuit may be placed in a shutdown mode when the radio frequency circuit is active.Type: GrantFiled: March 31, 2004Date of Patent: July 2, 2013Assignee: Silicon Laboratories, Inc.Inventors: Phillip M. Matthews, Frederick A. Rush, G. Diwakar Vishakhadatta
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Patent number: 8472990Abstract: A method of operating a radio-frequency (RF) circuitry and a signal-processing circuitry in a mobile telephone apparatus includes at least partially disabling the signal-processing circuitry while transmitting or receiving signals. In one example, a processor is efficiently disabled by generating and servicing an interrupt of relatively high priority. One advantage of this example is that preexisting, legacy code can be maintained, while still achieving the desired objectives. The processor can be enabled by generating and servicing a second high priority interrupt.Type: GrantFiled: July 23, 2004Date of Patent: June 25, 2013Assignee: St Ericsson SAInventors: Frederick A. Rush, G. Diwakar Vishakhadatta, Phillip M. Matthews
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Patent number: 8467483Abstract: A radio-frequency apparatus includes an integrated circuit. The integrated circuit includes receiver analog circuitry, receiver digital circuitry, a digital-to-analog converter, and a signal selector. The receiver analog circuitry receives radio-frequency signals, and provides a first digital signal. The receiver digital circuitry receives the first digital signal, and provides a second digital signal. The digital-to-analog converter converts the second digital signal into a first analog signal. The signal selector receives the second digital signal and the first analog signal, and selectively provides one of the second digital signal and the first analog signal as an output signal of the integrated circuit.Type: GrantFiled: March 13, 2003Date of Patent: June 18, 2013Assignee: Silicon Laboratories Inc.Inventors: G. Diwakar Vishakhadatta, Donald A. Kerth, Jeffrey W. Scott, Richard T. Behrens, G. Tyson Tuttle, Vishnu S. Srinivasan
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Patent number: 8422964Abstract: Radio-frequency (RF) apparatus includes receiver analog circuitry that receives an RF signal and provides at least one digital signal to receiver digital circuitry that functions in cooperation with the receiver analog circuitry. The receiver analog circuitry and the receiver digital circuitry are partitioned so that interference effects between the receiver analog circuitry and the receiver digital circuitry tend to be reduced.Type: GrantFiled: May 10, 2011Date of Patent: April 16, 2013Assignee: Silicon Laboratories Inc.Inventors: Donald A. Kerth, Richard T. Behrens, Jeffrey W. Scott, G. Diwakar Vishakhadatta, G. Tyson Tuttle, Vishnu Shankar Srinivasan
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Patent number: 8224259Abstract: A radio-frequency (RF) receiver includes a receiver analog circuitry and a receiver digital circuitry. The receiver analog circuitry resides within a first integrated circuit and the receiver digital circuitry resides within a second integrated circuit. The second integrated circuit couples to the first integrated circuit via a one-bit digital interface. The receiver analog circuitry receives an RF signal and processes the received RF signal to generate a digital signal. The receiver analog circuitry provides the digital signal to the receiver digital circuitry. The receiver digital circuitry includes a digital down-converter circuitry that mixes the digital signal with an intermediate frequency (IF) local oscillator (LO) signal to generate a digital down-converted signal. The receiver digital circuitry also includes a digital filter circuitry that filters the digital down-converted signal to generate a filtered digital signal.Type: GrantFiled: March 1, 2010Date of Patent: July 17, 2012Assignee: Silicon Laboratories Inc.Inventors: Richard T. Behrens, Tod Paulus, Mark S. Spurbeck, Vishnu S. Srinivasan, Donald A. Kerth, Jeffrey W. Scott, G. Tyson Tuttle, G. Diwakar Vishakhadatta
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Publication number: 20110230158Abstract: Radio-frequency (RF) apparatus includes receiver analog circuitry that receives an RF signal and provides at least one digital signal to receiver digital circuitry that functions in cooperation with the receiver analog circuitry. The receiver analog circuitry and the receiver digital circuitry are partitioned so that interference effects between the receiver analog circuitry and the receiver digital circuitry tend to be reduced.Type: ApplicationFiled: May 10, 2011Publication date: September 22, 2011Inventors: Donald A. Kerth, Richard T. Behrens, Jeffrey W. Scott, G. Diwakar Vishakhadatta, G. Tyson Tuttle, Vishnu Shankar Srinivasan
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Patent number: 7941102Abstract: Radio-frequency (RF) apparatus includes receiver analog circuitry that receives an RF signal and provides at least one digital signal to receiver digital circuitry that functions in cooperation with the receiver analog circuitry. The receiver analog circuitry and the receiver digital circuitry are partitioned so that interference effects between the receiver analog circuitry and the receiver digital circuitry tend to be reduced.Type: GrantFiled: October 31, 2007Date of Patent: May 10, 2011Assignee: Silicon Laboratories Inc.Inventors: Donald A. Kerth, Richard T. Behrens, Jeffrey W. Scott, G. Diwakar Vishakhadatta, G. Tyson Tuttle, Vishnu Shankar Srinivasan
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Publication number: 20100267353Abstract: A converter in a radio-frequency (RF) apparatus includes a feedback circuitry. The feedback circuitry has a shielded input and a shielded output. The shielded input and the shielded output of the feedback circuitry tend to reduce interference in the converter.Type: ApplicationFiled: June 30, 2010Publication date: October 21, 2010Inventors: Donald A. Kerth, G. Diwakar Vishakhadatta
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Publication number: 20100246995Abstract: A method is disclosed for performing dual mode image rejection calibration in a receiver. A first image correction factor is acquired using a first known signal associated with a first signal band during a startup mode. The first image correction factor has a plurality of bits including most significant bits (MSBs) and least significant bits (LSBs). The LSBs of the first image correction factor are adjusted incrementally during a normal operation mode. A radio frequency (RF) signal associated with the first signal band is received using the first image correction factor during the normal operation mode.Type: ApplicationFiled: February 17, 2010Publication date: September 30, 2010Applicant: SILICON LABORATORIES, INC.Inventors: Tod Paulus, Donald A. Kerth, Srihari Adireddy, G. Diwakar Vishakhadatta
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Patent number: 7805170Abstract: One aspect of the invention is directed towards a switching power regulator and a non-switching power regulator in conjunction to provide regulated power to the digital logic. The digital logic and switching regulator may be deactivated during RF activity so that interference from both the digital circuitry and the switching regulator is significantly reduced. Also, the state of the digital circuitry may be maintained during this standby period by using the non-switching power regulator to provide an as-required leakage current to the digital circuitry in order to maintain state. After the RF event (e.g. sending or receiving data) has concluded, the switching regulator may be activated and digital processing continued using the digital logic with no loss of continuity.Type: GrantFiled: March 30, 2005Date of Patent: September 28, 2010Assignee: ST-Ericsson SAInventor: G. Diwakar Vishakhadatta
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Patent number: 7761056Abstract: A method of operating a radio-frequency (RF) circuitry and a signal-processing circuitry in a mobile telephone apparatus includes at least partially disabling the signal-processing circuitry while transmitting or receiving signals. In one example, a processor is efficiently disabled by generating and servicing an interrupt of relatively high priority. One advantage of this example is that preexisting, legacy code can be maintained, while still achieving the desired objectives. The processor can be enabled by generating and servicing a second high priority interrupt.Type: GrantFiled: July 23, 2004Date of Patent: July 20, 2010Assignee: ST-Ericsson SAInventors: Frederick A. Rush, G. Diwakar Vishakhadatta, Phillip M. Matthews
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Publication number: 20100166124Abstract: A radio-frequency (RF) receiver includes a receiver analog circuitry and a receiver digital circuitry. The receiver analog circuitry resides within a first integrated circuit and the receiver digital circuitry resides within a second integrated circuit. The second integrated circuit couples to the first integrated circuit via a one-bit digital interface. The receiver analog circuitry receives an RF signal and processes the received RF signal to generate a digital signal. The receiver analog circuitry provides the digital signal to the receiver digital circuitry. The receiver digital circuitry includes a digital down-converter circuitry that mixes the digital signal with an intermediate frequency (IF) local oscillator (LO) signal to generate a digital down-converted signal. The receiver digital circuitry also includes a digital filter circuitry that filters the digital down-converted signal to generate a filtered digital signal.Type: ApplicationFiled: March 1, 2010Publication date: July 1, 2010Inventors: Richard T. Behrens, Tod Paulus, Mark S. Spurbeck, Vishnu S. Srinivasan, Donald A. Kerth, Jeffrey W. Scott, G. Tyson Tuttle, G. Diwakar Vishakhadatta
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Patent number: 7702362Abstract: A radio-frequency (RF) receiver includes a receiver analog circuitry and a receiver digital circuitry. The receiver analog circuitry resides within a first integrated circuit and the receiver digital circuitry resides within a second integrated circuit. The second integrated circuit couples to the first integrated circuit via a one-bit digital interface. The receiver analog circuitry receives an RF signal and processes the received RF signal to generate a digital signal. The receiver analog circuitry provides the digital signal to the receiver digital circuitry. The receiver digital circuitry includes a digital down-converter circuitry that mixes the digital signal with an intermediate frequency (IF) local oscillator (LO) signal to generate a digital down-converted signal. The receiver digital circuitry also includes a digital filter circuitry that filters the digital down-converted signal to generate a filtered digital signal.Type: GrantFiled: November 28, 2005Date of Patent: April 20, 2010Assignee: Silicon Laboratories Inc.Inventors: Richard T. Behrens, Tod Paulus, Mark S. Spurbeck, Vishnu S. Srinivasan, Donald A. Kerth, Jeffrey W. Scott, G. Tyson Tuttle, G. Diwakar Vishakhadatta
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Patent number: 7676210Abstract: A method is disclosed for performing dual mode image rejection calibration in a receiver. A first image correction factor is acquired for use in a receiver system using a first known signal associated with a first signal band during a startup mode. The first image correction factor is adjusted incrementally during a normal operation mode. A radio frequency (RF) signal associated with the first signal band is received using the first image correction factor during the normal operation mode.Type: GrantFiled: September 15, 2005Date of Patent: March 9, 2010Inventors: Tod Paulus, Donald A. Kerth, Srihari Adireddy, G. Diwakar Vishakhadatta
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Patent number: 7671560Abstract: In one embodiment, the present invention includes a method for performing a test on a rechargeable battery to indirectly determine a state of protection circuitry associated with the battery. The method may discharge the battery by controlling a pull-down current into a system, determine if the battery voltage falls below a first threshold level within a predetermined amount of time, and if so provide a pre-charge current to the battery.Type: GrantFiled: September 22, 2006Date of Patent: March 2, 2010Assignee: ST-Ericsson SAInventors: Russell Croman, G. Diwakar Vishakhadatta, Lionel Cimaz
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Patent number: 7433393Abstract: A method of operating a radio-frequency (RF) circuitry and a signal-processing circuitry in a mobile telephone apparatus includes at least partially disabling the signal-processing circuitry while transmitting or receiving signals. In one example, a processor is efficiently disabled by generating and servicing an interrupt of relatively high priority. One advantage of this example is that preexisting, legacy code can be maintained, while still achieving the desired objectives. The processor can be enabled by generating and servicing a second high priority interrupt.Type: GrantFiled: September 30, 2004Date of Patent: October 7, 2008Assignee: NXP B.V.Inventors: Shaojie Chen, Frederick A. Rush, G. Diwakar Vishakhadatta, Phillip M. Matthews