Patents by Inventor Kumar Lakshmi Parthasarathy

Kumar Lakshmi Parthasarathy 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).

  • Piecewise linear calibration method and circuit to correct transfer function errors of digital to analog converters
    Patent number: 6642869
    Abstract: A calibrated digital-to-analog converter (DAC) (15′) has a main DAC (17) having a digital input and an analog output. An on-chip memory (21) stores measured INL values of the main DAC at a few selected input codes, and digital interpolation (50,17) is used to approximate INL error values at all input codes (14 . . . 14VI). To cancel the INL errors of the main DAC, outputs of this digital interpolation are sent to a calibration DAC (19), which has an analog output subtracted from the analog output of the main DAC. This subtraction can also be done in the digital domain, removing the need for a calibration-DAC when a main DAC with higher bit-count is designed.
    Type: Grant
    Filed: May 1, 2002
    Date of Patent: November 4, 2003
    Assignee: Texas Instruments Incorporated
    Inventors: Turker Kuyel, Kumar Lakshmi Parthasarathy
  • PIECEWISE LINEAR CALIBRATION METHOD AND CIRCUIT TO CORRECT TRANSFER FUNCTION ERRORS OF DIGITAL TO ANALOG CONVERTERS
    Publication number: 20030160713
    Abstract: A calibrated digital-to-analog converter (DAC) (15′) has a main DAC (17) having a digital input and an analog output. An on-chip memory (21) stores measured INL values of the main DAC at a few selected input codes, and digital interpolation (50,17) is used to approximate INL error values at all input codes (14 . . . 14Vl). To cancel the INL errors of the main DAC, outputs of this digital interpolation are sent to a calibration DAC (19), which has an analog output subtracted from the analog output of the main DAC. This subtraction can also be done in the digital domain, removing the need for a calibration-DAC when a main DAC with higher bit-count is designed.
    Type: Application
    Filed: May 1, 2002
    Publication date: August 28, 2003
    Applicant: Texas Instruments Incorporated
    Inventors: Turker Kuyel, Kumar Lakshmi Parthasarathy