Patents by Inventor Parameswaran K. Gopalier

Parameswaran K. Gopalier 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).

  • Phase-locked-loop with linear combination of charge pump and current controlled oscillator
    Patent number: 5687201
    Abstract: A phase-locked-loop (PLL) has a current controlled oscillator (ICO) whose gain varies with its input current. The PLL also contains a charge pump that controls the input current of the ICO and therefore the output frequency of the ICO. The charge pump has a gain that is controlled by the ICO input current in a manner which linearizes the combination of charge pump and ICO. This results in a substantially constant loop gain for a PLL.
    Type: Grant
    Filed: September 24, 1996
    Date of Patent: November 11, 1997
    Assignee: Standard Microsystems Corporation
    Inventors: Kelly Patrick McClellan, Parameswaran K. Gopalier, Khosrow Haj Sadeghi
  • Transconductance-capacitance filter with extended control range
    Patent number: 5612648
    Abstract: A G.sub.m -C filter is formed using transconductor elements having first and second degeneration FETs to which first and second control signals are applied. A phase-locked-loop is used to generate the control signals. The control range of the transconductor elements is increased so that the frequency response of the filter can be maintained over increased ranges of various parameters (e.g., supply voltage variations, temperature variations, etc.
    Type: Grant
    Filed: March 14, 1995
    Date of Patent: March 18, 1997
    Assignee: Standard Microsystems Corporation
    Inventors: Kelly P. McClellan, Parameswaran K. Gopalier, Khosrow H. Sadeghi