Patents by Inventor Praveen Kallam

Praveen Kallam 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: 10739845
    Abstract: An apparatus includes a circuit that has a normal mode of operation and a low-power mode of operation. The circuit consumes more power in the normal mode of operation than in the low-power mode of operation. The apparatus further includes a power-supply circuit. The power-supply circuit provides a normal supply voltage to the circuit in the normal mode of operation. The power-supply circuit includes a non-linear circuit to provide a compressed supply voltage to the circuit in the low-power mode of operation, wherein the normal supply voltage is greater than the compressed supply voltage.
    Type: Grant
    Filed: November 26, 2018
    Date of Patent: August 11, 2020
    Assignee: Silicon Laboratories Inc.
    Inventors: Praveen Kallam, Johnny Gudmund Bjornsen, Kenneth W. Fernald, Scott Willingham, Pavel Konecny
  • Patent number: 10355477
    Abstract: Circuitry and methods are provided that may be implemented to transfer digital signals between multiple voltage domains while some of these domains may be invalid, e.g., such as to transfer a digital signal from a source voltage domain to a destination voltage domain while the voltage of the source domain is zero or invalid. Possible implementations include, but are not limited to, for power selection and distribution in an integrated circuit chip that has multiple power sources (e.g., such as main power supply and a backup power supply), and in which at startup the chip is agnostic of (or is not aware of) which power supply or power supplies is actually powered and available.
    Type: Grant
    Filed: October 30, 2015
    Date of Patent: July 16, 2019
    Assignee: Silicon Laboratories Inc.
    Inventors: Mohamed Elsayed, Matthew Powell, Nicholas M. Atkinson, Praveen Kallam
  • Publication number: 20190163257
    Abstract: An apparatus includes a circuit that has a normal mode of operation and a low-power mode of operation. The circuit consumes more power in the normal mode of operation than in the low-power mode of operation. The apparatus further includes a power-supply circuit. The power-supply circuit provides a normal supply voltage to the circuit in the normal mode of operation. The power-supply circuit includes a non-linear circuit to provide a compressed supply voltage to the circuit in the low-power mode of operation, wherein the normal supply voltage is greater than the compressed supply voltage.
    Type: Application
    Filed: November 26, 2018
    Publication date: May 30, 2019
    Inventors: Praveen Kallam, Johnny Gudmund Bjornsen, Kenneth W. Fernald, Scott Willingham, Pavel Konecny
  • Patent number: 10139896
    Abstract: An apparatus includes a circuit that has a normal mode of operation and a low-power mode of operation. The circuit consumes more power in the normal mode of operation than in the low-power mode of operation. The apparatus further includes a power-supply circuit. The power-supply circuit provides a normal supply voltage to the circuit in the normal mode of operation. The power-supply circuit includes a non-linear circuit to provide a compressed supply voltage to the circuit in the low-power mode of operation, wherein the normal supply voltage is greater than the compressed supply voltage.
    Type: Grant
    Filed: July 8, 2015
    Date of Patent: November 27, 2018
    Assignee: Silicon Laboratories Inc.
    Inventors: Praveen Kallam, Johnny Gudmund Bjornsen, Kenneth W. Fernald, Scott Willingham, Pavel Konecny
  • Patent number: 10063084
    Abstract: An apparatus includes a digital battery charger. The digital battery charger includes an analog-to-digital converter (ADC) to convert a terminal voltage of a battery to a first digital signal. The digital battery charger further includes a digital controller coupled to the ADC to receive the first digital signal and provide a set of control signals. The digital battery charger further includes a current digital-to-analog converter (IDAC) coupled to the digital controller to receive the set of control signals and to provide a battery charging current signal.
    Type: Grant
    Filed: December 28, 2015
    Date of Patent: August 28, 2018
    Assignee: Silicon Laboratories Inc.
    Inventors: Axel Thomsen, Dazhi Wei, Steffen Skaug, Praveen Kallam
  • Patent number: 9966781
    Abstract: An apparatus includes a voltage regulator to regulate a voltage from a power source and to provide an output current at an output. The apparatus further includes a battery charger, coupled to the voltage regulator, to provide a charge current. The apparatus further includes a controller to control the charge current such that the charge current is less than or equal to a current available from the power source minus the output current.
    Type: Grant
    Filed: December 28, 2015
    Date of Patent: May 8, 2018
    Assignee: Silicon Laboratories Inc.
    Inventors: Dazhi Wei, Praveen Kallam
  • Patent number: 9964986
    Abstract: An apparatus includes an integrated circuit (IC). The IC includes a regulator to receive a plurality of input voltages and to provide a regulated output voltage to a load. The regulator includes a plurality of voltage regulators that receive the plurality of input voltages and provide the regulated output voltage as an output of the regulator. The IC further includes a controller that controls the regulator by using a voltage regulator in the plurality of voltage regulators to generate the regulated output voltage from the plurality of input voltages.
    Type: Grant
    Filed: December 29, 2015
    Date of Patent: May 8, 2018
    Assignee: Silicon Laboratories Inc.
    Inventors: Timothy T. Rueger, Praveen Kallam, Nicholas M. Atkinson
  • Patent number: 9958888
    Abstract: In one embodiment, an apparatus includes a controller to control a voltage regulator. The controller may have a first comparator circuit to compare a first reference voltage to a feedback voltage. In turn, the first comparator circuit may include: a first comparator having a first input terminal to receive the feedback voltage and a second input terminal to receive the reference voltage and an output node to output an error signal based on the comparison; and a first pre-charge circuit coupled between the first input terminal and the output node configured to pre-charge a first portion of a compensation network to a pre-charge level. The first controller may further include a second comparator circuit coupled to the first comparator circuit compare the error signal to a ramp signal and to generate a first control output to control a power train of the voltage regulator in a first mode of operation.
    Type: Grant
    Filed: June 16, 2015
    Date of Patent: May 1, 2018
    Assignee: Silicon Laboratories Inc.
    Inventors: Dazhi Wei, Gang Yuan, Erik Pankratz, Imranul Islam, Praveen Kallam, Axel Thomsen, Kenneth Wilson Fernald, Jinwen Xiao
  • Patent number: 9866215
    Abstract: In one embodiment, a voltage comparator circuit includes a first comparator circuit to compare a first voltage and a second voltage and a second comparator circuit to compare the first voltage and the second voltage. The voltage comparator circuit may include charge storage circuitry and positive feedback circuitry. Such circuitry may boost current within the first and second comparator circuits to enable the voltage comparator circuit to output a comparison decision within a delay threshold in response to input transitions within a slew rate threshold.
    Type: Grant
    Filed: September 30, 2015
    Date of Patent: January 9, 2018
    Assignee: Silicon Laboratories Inc.
    Inventors: Nicholas Montgomery Atkinson, Praveen Kallam, Mohamed Mostafa Elsayed
  • Patent number: 9836071
    Abstract: An apparatus includes an integrated circuit (IC). The IC includes a power controller, which includes a regulator and a controller. The regulator receives a plurality of input voltages and provides a regulated output voltage. The controller controls the regulator to generate the regulated output voltage from the plurality of input voltages. The power controller provides power to a load integrated in the IC from a set of arbitrary input voltages. The set of arbitrary input voltages includes the plurality of input voltages.
    Type: Grant
    Filed: December 29, 2015
    Date of Patent: December 5, 2017
    Assignee: Silicon Laboratories Inc.
    Inventors: Nicholas M. Atkinson, Praveen Kallam, Timothy T. Rueger
  • Patent number: 9787310
    Abstract: In some embodiments, a method may include receiving an input signal at an input stage of a circuit and amplifying the input signal using an amplifier of the circuit to produce a level-shifted output signal. The method may further include selectively controlling switches of an active load coupled to the input stage based on the level-shifted output signal to turn off current flow between transitions in the input signal.
    Type: Grant
    Filed: December 17, 2014
    Date of Patent: October 10, 2017
    Assignee: Silicon Laboratories Inc.
    Inventors: Chao Yang, Praveen Kallam
  • Publication number: 20170185096
    Abstract: An apparatus includes an integrated circuit (IC). The IC includes a regulator to receive a plurality of input voltages and to provide a regulated output voltage to a load. The regulator includes a plurality of voltage regulators that receive the plurality of input voltages and provide the regulated output voltage as an output of the regulator. The IC further includes a controller that controls the regulator by using a voltage regulator in the plurality of voltage regulators to generate the regulated output voltage from the plurality of input voltages.
    Type: Application
    Filed: December 29, 2015
    Publication date: June 29, 2017
    Inventors: Timothy T. Rueger, Praveen Kallam, Nicholas M. Atkinson
  • Publication number: 20170185094
    Abstract: An apparatus includes an integrated circuit (IC). The IC includes a power controller, which includes a regulator and a controller. The regulator receives a plurality of input voltages and provides a regulated output voltage. The controller controls the regulator to generate the regulated output voltage from the plurality of input voltages. The power controller provides power to a load integrated in the IC from a set of arbitrary input voltages. The set of arbitrary input voltages includes the plurality of input voltages.
    Type: Application
    Filed: December 29, 2015
    Publication date: June 29, 2017
    Inventors: Nicholas M. Atkinson, Praveen Kallam, Timothy T. Rueger
  • Publication number: 20170187218
    Abstract: An apparatus includes a digital battery charger. The digital battery charger includes an analog-to-digital converter (ADC) to convert a terminal voltage of a battery to a first digital signal. The digital battery charger further includes a digital controller coupled to the ADC to receive the first digital signal and provide a set of control signals. The digital battery charger further includes a current digital-to-analog converter (IDAC) coupled to the digital controller to receive the set of control signals and to provide a battery charging current signal.
    Type: Application
    Filed: December 28, 2015
    Publication date: June 29, 2017
    Inventors: Axel Thomsen, Dazhi Wei, Steffen Skaug, Praveen Kallam
  • Publication number: 20170187199
    Abstract: An apparatus includes a voltage regulator to regulate a voltage from a power source and to provide an output current at an output. The apparatus further includes a battery charger, coupled to the voltage regulator, to provide a charge current. The apparatus further includes a controller to control the charge current such that the charge current is less than or equal to a current available from the power source minus the output current.
    Type: Application
    Filed: December 28, 2015
    Publication date: June 29, 2017
    Inventors: Dazhi Wei, Praveen Kallam
  • Publication number: 20170126005
    Abstract: Circuitry and methods are provided that may be implemented to transfer digital signals between multiple voltage domains while some of these domains may be invalid, e.g., such as to transfer a digital signal from a source voltage domain to a destination voltage domain while the voltage of the source domain is zero or invalid. Possible implementations include, but are not limited to, for power selection and distribution in an integrated circuit chip that has multiple power sources (e.g., such as main power supply and a backup power supply), and in which at startup the chip is agnostic of (or is not aware of) which power supply or power supplies is actually powered and available.
    Type: Application
    Filed: October 30, 2015
    Publication date: May 4, 2017
    Inventors: Mohamed Elsayed, Matthew Powell, Nicholas M. Atkinson, Praveen Kallam
  • Patent number: 9625925
    Abstract: A method includes using a pass device of a linear regulator to provide an output signal to an output of the linear regulator in response to a signal that is received at a control terminal of the pass device. The method includes using the linear regulator to regulate the signal received at the control terminal based at least in part on the output signal; and controlling a closed loop frequency response of the linear regulator to cause a direct current (DC) gain of the linear regulator to extend to a frequency near or at frequency of a zero that is associated with a decoupling capacitor that is coupled to the output of the linear regulator.
    Type: Grant
    Filed: November 24, 2014
    Date of Patent: April 18, 2017
    Assignee: Silicon Laboratories Inc.
    Inventors: Shouli Yan, Axel Thomsen, Praveen Kallam
  • Publication number: 20170093399
    Abstract: In one embodiment, a voltage comparator circuit includes a first comparator circuit to compare a first voltage and a second voltage and a second comparator circuit to compare the first voltage and the second voltage. The voltage comparator circuit may include charge storage circuitry and positive feedback circuitry. Such circuitry may boost current within the first and second comparator circuits to enable the voltage comparator circuit to output a comparison decision within a delay threshold in response to input transitions within a slew rate threshold.
    Type: Application
    Filed: September 30, 2015
    Publication date: March 30, 2017
    Inventors: Nicholas Montgomery Atkinson, Praveen Kallam, Mohamed Mostafa Elsayed
  • Publication number: 20170010660
    Abstract: An apparatus includes a circuit that has a normal mode of operation and a low-power mode of operation. The circuit consumes more power in the normal mode of operation than in the low-power mode of operation. The apparatus further includes a power-supply circuit. The power-supply circuit provides a normal supply voltage to the circuit in the normal mode of operation. The power-supply circuit includes a non-linear circuit to provide a compressed supply voltage to the circuit in the low-power mode of operation, wherein the normal supply voltage is greater than the compressed supply voltage.
    Type: Application
    Filed: July 8, 2015
    Publication date: January 12, 2017
    Inventors: Praveen Kallam, Johnny Gudmund Bjornsen, Kenneth W. Fernald, Scott Willingham, Pavel Konecny
  • Publication number: 20160370816
    Abstract: In one embodiment, an apparatus includes a controller to control a voltage regulator. The controller may have a first comparator circuit to compare a first reference voltage to a feedback voltage. In turn, the first comparator circuit may include: a first comparator having a first input terminal to receive the feedback voltage and a second input terminal to receive the reference voltage and an output node to output an error signal based on the comparison; and a first pre-charge circuit coupled between the first input terminal and the output node configured to pre-charge a first portion of a compensation network to a pre-charge level. The first controller may further include a second comparator circuit coupled to the first comparator circuit compare the error signal to a ramp signal and to generate a first control output to control a power train of the voltage regulator in a first mode of operation.
    Type: Application
    Filed: June 16, 2015
    Publication date: December 22, 2016
    Inventors: Dazhi Wei, Gang Yuan, Erik Pankratz, Imranul Islam, Praveen Kallam, Axel Thomsen, Kenneth Wilson Fernald, Jinwen Xiao