Patents Assigned to ST-Ericsson India Pvt. Ltd.
  • Patent number: 8787597
    Abstract: Systems and methods for suppressing pop-up noise in an audio signal are disclosed. The system includes a driver circuit shared by a pin interface and a complementary pin interface. A control unit is coupled to the pin interface and the complementary pin interface. To activate the pin interface, the control unit is configured to first activate the driver output at the complementary pin interface. Once the complementary pin interface achieves a preset voltage, the driver output is switched to the pin interface by the control unit. In addition, the driver circuit can be calibrated for a DC offset on the complementary pin interface by re-using calibration data calculated at the pin interface. Further, DC correction signals can be provided from a pre-biasing circuit based on the calibration data of the driver circuit.
    Type: Grant
    Filed: February 25, 2010
    Date of Patent: July 22, 2014
    Assignees: St-Ericsson India Pvt. Ltd., St-Ericsson SA
    Inventors: Sanjeev Ranganathan, Shyam Somayajula, Srinath Sridharan, Lionel Cimaz
  • Patent number: 8085080
    Abstract: Systems and methods for generation of a low jitter clock signal for wireless circuits are disclosed. In an implementation, the system includes a wireless circuit powered by a first power supply and a low jitter clock (LJC) generator powered by a second power supply. The LJC generator provides at least one clock signal to the wireless circuit. The system further includes an LJC driver circuit including a clock buffer powered by the first power supply and a receive buffer powered by the second power supply.
    Type: Grant
    Filed: February 26, 2010
    Date of Patent: December 27, 2011
    Assignees: ST-Ericsson SA, ST-Ericsson India Pvt. Ltd.
    Inventors: Srinath Sridharan, Ramkishore Ganti, Patrick Guyard
  • Publication number: 20110256906
    Abstract: A communication system for implementing locking of a device (102) is described. The device (102) can be locked to a network service provider for a validity period. After expiry of the validity period, the device (102) can be automatically unlocked. In locked mode of operation, an integrated circuit (IC) card tool-kit (214) that is used for housing the IC card, is disabled in the device (102). During the validity period, the device (102) transmits an equipment identity number to the network service provider while initiating a request for communication. The network service provider dynamically allocates a subscriber identity number to facilitate communication process. After expiry of the validity period, the device (102) is unlocked automatically and the IC tool-kit (214) of the device (102) is enabled.
    Type: Application
    Filed: December 23, 2009
    Publication date: October 20, 2011
    Applicants: ST-ERICSSON SA, ST-ERICSSON INDIA PVT.LTD.
    Inventor: Praveenya Kumar
  • Publication number: 20100220875
    Abstract: Systems and methods for suppressing pop-up noise in an audio signal are disclosed. The system includes a driver circuit shared by a pin interface and a complementary pin interface. A control unit is coupled to the pin interface and the complementary pin interface. To activate the pin interface, the control unit is configured to first activate the driver output at the complementary pin interface. Once the complementary pin interface achieves a preset voltage, the driver output is switched to the pin interface by the control unit. In addition, the driver circuit can be calibrated for a DC offset on the complementary pin interface by re-using calibration data calculated at the pin interface. Further, DC correction signals can be provided from a pre-biasing circuit based on the calibration data of the driver circuit.
    Type: Application
    Filed: February 25, 2010
    Publication date: September 2, 2010
    Applicants: ST-Ericsson India Pvt. Ltd., ST-Ericsson SA
    Inventors: Sanjeev Ranganathan, Shyam Somayajula, Srinath Sridharan, Lionel Cimaz
  • Publication number: 20100219871
    Abstract: Systems and methods for generation of a low jitter clock signal for wireless circuits are disclosed. In an implementation, the system includes a wireless circuit powered by a first power supply and a low jitter clock (LJC) generator powered by a second power supply. The LJC generator provides at least one clock signal to the wireless circuit. The system further includes an LJC driver circuit including a clock buffer powered by the first power supply and a receive buffer powered by the second power supply.
    Type: Application
    Filed: February 26, 2010
    Publication date: September 2, 2010
    Applicants: ST-Ericsson India Pvt Ltd., ST-Ericsson SA
    Inventors: Srinath Sridharan, Ramkishore Ganti, Patrick Guyard
  • Publication number: 20100220868
    Abstract: Systems and methods for a low pin architecture to couple speakers with integrated circuits are disclosed herein. In an implementation, the low pin architecture facilitates in reducing the required pin interfaces to couple a low power speaker, a high power speaker, and earphone speakers with integrated circuits (ICs). For this, the high power speaker can be cross-coupled between the pin interfaces that are coupled to the low power speaker and the earphone speakers. These pin interfaces are driven by corresponding driver circuits. In said implementation, some of the driver circuits can be shared to drive multiple pin interfaces. These shared driver circuits include a combined cascode circuit having a first cascode circuit integrated with a second cascode circuit to reliably and selectively drive one or more of the pin interfaces.
    Type: Application
    Filed: February 25, 2010
    Publication date: September 2, 2010
    Applicants: ST-Ericsson India Pvt. Ltd, ST-Ericsson SA
    Inventors: Sanjeev Ranganathan, Shyam Somayajula, Srinath Sridharan, Arnold D'Souza, Ramkishore Ganti, Lionel Cimaz