Patents by Inventor Karthik S. Gopalakrishnan

Karthik S. Gopalakrishnan 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: 11728817
    Abstract: The present invention relates to data communication and electrical circuits. More specifically, embodiments of the present invention provide a clock and data recovery (CDR) architecture implementation for high data rate wireline communication links. In an embodiment, a CDR device includes a phase detector, a loop filter, and a fractional-N PLL. The fractional-N PLL generates output clock signal based on output of the loop filter. There are other embodiments as well.
    Type: Grant
    Filed: January 3, 2022
    Date of Patent: August 15, 2023
    Assignee: MARVELL ASIA PTE LTD
    Inventors: Mrunmay Talegaonkar, Jorge Pernillo, Junyi Sun, Praveen Prabha, Chang-Feng Loi, Yu Liao, Jamal Riani, Belal Helal, Karthik S. Gopalakrishnan, Aaron Buchwald
  • Publication number: 20220326090
    Abstract: A temperature sensor system for an integrated circuit includes at least one sensor configured to generate a sensor signal indicative of a temperature in a respective location of the integrated circuit and a sensing module configured to receive the sensor signal, determine a temperature of the at least one sensor based on the sensor signal, an electrical characteristic of the at least one sensor, and a relationship between the electrical characteristic and the temperature of the at least one sensor, the relationship corresponding to variations in the electrical characteristic at a known calibration temperature, and generate a temperature signal based on the determined temperature.
    Type: Application
    Filed: May 10, 2022
    Publication date: October 13, 2022
    Inventors: Sadettin Cirit, Karthik S. Gopalakrishnan
  • Publication number: 20220190836
    Abstract: The present invention relates to data communication and electrical circuits. More specifically, embodiments of the present invention provide a clock and data recovery (CDR) architecture implementation for high data rate wireline communication links. In an embodiment, a CDR device includes a phase detector, a loop filter, and a fractional-N PLL. The fractional-N PLL generates output clock signal based on output of the loop filter. There are other embodiments as well.
    Type: Application
    Filed: January 3, 2022
    Publication date: June 16, 2022
    Inventors: Mrunmay TALEGAONKAR, Jorge PERNILLO, Junyi SUN, Praveen PRABHA, Chang-Feng LOI, Yu LIAO, Jamal RIANI, Belal HELAL, Karthik S. GOPALAKRISHNAN, Aaron BUCHWALD
  • Patent number: 11326961
    Abstract: The present invention relates to integrated circuits. More specifically, embodiments of the present invention provide methods and systems for determining temperatures of an integrated circuit using an one-point calibration technique, where temperature is determined by a single temperature measurement and calculation using known electrical characteristics of the integrated circuit.
    Type: Grant
    Filed: September 19, 2019
    Date of Patent: May 10, 2022
    Assignee: Marvell Asia Pte Ltd.
    Inventors: Sadettin Cirit, Karthik S. Gopalakrishnan
  • Publication number: 20200011741
    Abstract: The present invention relates to integrated circuits. More specifically, embodiments of the present invention provide methods and systems for determining temperatures of an integrated circuit using an one-point calibration technique, where temperature is determined by a single temperature measurement and calculation using known electrical characteristics of the integrated circuit.
    Type: Application
    Filed: September 19, 2019
    Publication date: January 9, 2020
    Inventors: Sadettin CIRIT, Karthik S. GOPALAKRISHNAN
  • Patent number: 10458856
    Abstract: The present invention relates to integrated circuits. More specifically, embodiments of the present invention provide methods and systems for determining temperatures of an integrated circuit using an one-point calibration technique, where temperature is determined by a single temperature measurement and calculation using known electrical characteristics of the integrated circuit.
    Type: Grant
    Filed: January 19, 2017
    Date of Patent: October 29, 2019
    Assignee: INPHI CORPORATION
    Inventors: Sadettin Cirit, Karthik S. Gopalakrishnan
  • Patent number: 9806722
    Abstract: The present invention is directed to signal processing system and electrical circuits. According to various embodiments, a DLL system includes a delay line provides multiple output signals associated with different clock phases. The delay line may be adjusted using a pair of bias voltages. A phase detector systems generates the bias voltages using the multiple output signals from the delay line. The multiple output signals include signals associated with the first phase, the last phase, and two adjacent phases. There are other embodiments as well.
    Type: Grant
    Filed: August 12, 2016
    Date of Patent: October 31, 2017
    Assignee: INPHI CORPORATION
    Inventors: Guojun Ren, James Gorecki, Karthik S. Gopalakrishnan
  • Patent number: 9780797
    Abstract: The present invention relates generally to integrated circuits. More particularly, the present invention provides a circuit and method for regulating a voltage for a high speed serializer/deserializer (SerDes) device. But it will be recognized that the technique can be used for regulating memory devices (e.g., DDR 4 SDRAM devices, DDR4 register devices, DDR4 controller devices), and other high speed data applications. In various embodiments, phase-interpolator is implemented in conjunction with a delay-lock loop (DLL) and an SR latch, where one or more outputs of the DLL is used by the SR latch. Additionally, such techniques can be used for a variety of applications such as network and/or computer storage systems, computer servers, hand held computing devices, portable computing devices, computer systems, network appliances and/or switches, routers, and gateways, and the like.
    Type: Grant
    Filed: March 21, 2017
    Date of Patent: October 3, 2017
    Assignee: INPHI CORPORATION
    Inventors: Karthik S. Gopalakrishnan, Guojun Ren, Parmanand Mishra
  • Publication number: 20170257237
    Abstract: The present invention is directed to communication systems. More specifically, embodiments of the present invention provide a technique and system thereof for performing eye modulation. Eye modulation is performed at the transmission side of a PAM communication system to compensate for distortion and non-linearity and generate an output waveform. Spacing among eye levels is adjusted by performing symmetric modulation using ? parameter and asymmetric modulation using ? parameter. A correction module measures the output waveform and sends feedback signals to a control module to adjust the ? parameter and the ? parameter. There are other embodiments as well.
    Type: Application
    Filed: January 11, 2017
    Publication date: September 7, 2017
    Inventors: Halil CIRIT, Karthik S. GOPALAKRISHNAN
  • Patent number: 9755870
    Abstract: The present invention is directed to communication systems. More specifically, embodiments of the present invention provide a technique and system thereof for performing eye modulation. Eye modulation is performed at the transmission side of a PAM communication system to compensate for distortion and non-linearity and generate an output waveform. Spacing among eye levels is adjusted by performing symmetric modulation using ? parameter and asymmetric modulation using ? parameter. A correction module measures the output waveform and sends feedback signals to a control module to adjust the ? parameter and the ? parameter. There are other embodiments as well.
    Type: Grant
    Filed: January 11, 2017
    Date of Patent: September 5, 2017
    Assignee: INPHI CORPORATION
    Inventors: Halil Cirit, Karthik S. Gopalakrishnan
  • Publication number: 20170194970
    Abstract: The present invention relates generally to integrated circuits. More particularly, the present invention provides a circuit and method for regulating a voltage for a high speed serializer/deserializer (SerDes) device. But it will be recognized that the technique can be used for regulating memory devices (e.g., DDR 4 SDRAM devices, DDR4 register devices, DDR4 controller devices), and other high speed data applications. In various embodiments, phase-interpolator is implemented in conjunction with a delay-lock loop (DLL) and an SR latch, where one or more outputs of the DLL is used by the SR latch. Additionally, such techniques can be used for a variety of applications such as network and/or computer storage systems, computer servers, hand held computing devices, portable computing devices, computer systems, network appliances and/or switches, routers, and gateways, and the like.
    Type: Application
    Filed: March 21, 2017
    Publication date: July 6, 2017
    Inventors: Karthik S. GOPALAKRISHNAN, Guojun REN, Parmanand MISHRA
  • Patent number: 9683903
    Abstract: The present invention relates generally to integrated circuits. More particularly, the present invention provides a circuit and method for sensing a voltage and/or temperature from an integrated circuit device such as a Serializer/Deserializer (SerDes) integrated circuit device. But it will be recognized that the technique can be used for monitoring other system on chip devices, such as micro-controllers, digital signal processors, microprocessors, networking devices, application specific integrated circuits, and other integrated circuit devices that may desire on-chip temperature and/or voltage sensing capability.
    Type: Grant
    Filed: November 11, 2015
    Date of Patent: June 20, 2017
    Assignee: INPHI CORPORATION
    Inventors: Karthik S. Gopalakrishnan, Sadettin Cirit
  • Publication number: 20170131153
    Abstract: The present invention relates to integrated circuits. More specifically, embodiments of the present invention provide methods and systems for determining temperatures of an integrated circuit using an one-point calibration technique, where temperature is determined by a single temperature measurement and calculation using known electrical characteristics of the integrated circuit.
    Type: Application
    Filed: January 19, 2017
    Publication date: May 11, 2017
    Inventors: Sadettin CIRIT, Karthik S. GOPALAKRISHNAN
  • Patent number: 9641313
    Abstract: The present invention relates generally to integrated circuits. More particularly, the present invention provides a circuit and method for regulating a voltage for a high speed serializer/deserializer (SerDes) device. But it will be recognized that the technique can be used for regulating memory devices (e.g., DDR 4 SDRAM devices, DDR4 register devices, DDR4 controller devices), and other high speed data applications. In various embodiments, phase-interpolator is implemented in conjunction with a delay-lock loop (DLL) and an SR latch, where one or more outputs of the DLL is used by the SR latch. Additionally, such techniques can be used for a variety of applications such as network and/or computer storage systems, computer servers, hand held computing devices, portable computing devices, computer systems, network appliances and/or switches, routers, and gateways, and the like.
    Type: Grant
    Filed: August 13, 2015
    Date of Patent: May 2, 2017
    Assignee: INPHI CORPORATION
    Inventors: Karthik S. Gopalakrishnan, Guojun Ren, Parmanand Mishra
  • Patent number: 9587992
    Abstract: The present invention relates to integrated circuits. More specifically, embodiments of the present invention provide methods and systems for determining temperatures of an integrated circuit using an one-point calibration technique, where temperature is determined by a single temperature measurement and calculation using known electrical characteristics of the integrated circuit.
    Type: Grant
    Filed: September 9, 2013
    Date of Patent: March 7, 2017
    Assignee: INPHI CORPORATION
    Inventors: Sadettin Cirit, Karthik S. Gopalakrishnan
  • Publication number: 20170033799
    Abstract: The present invention is directed to signal processing system and electrical circuits. According to various embodiments, a DLL system includes a delay line provides multiple output signals associated with different clock phases. The delay line may be adjusted using a pair of bias voltages. A phase detector systems generates the bias voltages using the multiple output signals from the delay line. The multiple output signals include signals associated with the first phase, the last phase, and two adjacent phases. There are other embodiments as well.
    Type: Application
    Filed: August 12, 2016
    Publication date: February 2, 2017
    Inventors: Guojun REN, James GORECKI, Karthik S. GOPALAKRISHNAN
  • Patent number: 9559880
    Abstract: The present invention is directed to communication systems. More specifically, embodiments of the present invention provide a technique and system thereof for performing eye modulation. Eye modulation is performed at the transmission side of a PAM communication system to compensate for distortion and non-linearity and generate an output waveform. Spacing among eye levels is adjusted by performing symmetric modulation using ? parameter and asymmetric modulation using ? parameter. A correction module measures the output waveform and sends feedback signals to a control module to adjust the ? parameter and the ? parameter. There are other embodiments as well.
    Type: Grant
    Filed: March 4, 2016
    Date of Patent: January 31, 2017
    Assignee: INPHI CORPORATION
    Inventors: Halil Cirit, Karthik S. Gopalakrishnan
  • Patent number: 9438255
    Abstract: The present invention is directed to signal processing system and electrical circuits. According to various embodiments, a DLL system includes a delay line provides multiple output signals associated with different clock phases. The delay line may be adjusted using a pair of bias voltages. A phase detector systems generates the bias voltages using the multiple output signals from the delay line. The multiple output signals include signals associated with the first phase, the last phase, and two adjacent phases. There are other embodiments as well.
    Type: Grant
    Filed: July 31, 2015
    Date of Patent: September 6, 2016
    Assignee: INPHI CORPORATION
    Inventors: Guojun Ren, James Gorecki, Karthik S. Gopalakrishnan
  • Publication number: 20160103023
    Abstract: The present invention relates generally to integrated circuits. More particularly, the present invention provides a circuit and method for sensing a voltage and/or temperature from an integrated circuit device such as a Serializer/Deserializer (SerDes) integrated circuit device. But it will be recognized that the technique can be used for monitoring other system on chip devices, such as micro-controllers, digital signal processors, microprocessors, networking devices, application specific integrated circuits, and other integrated circuit devices that may desire on-chip temperature and/or voltage sensing capability.
    Type: Application
    Filed: November 11, 2015
    Publication date: April 14, 2016
    Inventors: Karthik S. GOPALAKRISHNAN, Sadettin CIRIT
  • Patent number: 9212952
    Abstract: The present invention relates generally to integrated circuits. More particularly, the present invention provides a circuit and method for sensing a voltage and/or temperature from an integrated circuit device such as a Serializer/Deserializer (SerDes) integrated circuit device. But it will be recognized that the technique can be used for monitoring other system on chip devices, such as micro-controllers, digital signal processors, microprocessors, networking devices, application specific integrated circuits, and other integrated circuit devices that may desire on-chip temperature and/or voltage sensing capability.
    Type: Grant
    Filed: March 13, 2013
    Date of Patent: December 15, 2015
    Assignee: INPHI CORPORATION
    Inventors: Karthik S. Gopalakrishnan, Sadettin Cirit