Patents by Inventor Sabah Khesbak

Sabah Khesbak 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).

  • Variable-slope variable-gain amplifier
    Patent number: 6542029
    Abstract: A system for varying output power of variable-gain amplifiers (VGA) allows for varying the output power transfer function, thus varying the gain, and, hence, the resolution of the output power of the VGA. The preferred embodiment comprises a variable-slope VGA (VSVGA) circuit configured to operate within a closed-loop power-controlled CDMA handset. The VSVGA circuit manipulates the input control voltage of the VGA, thereby, adjusting the gain of the amplifier by varying the slope of a line which models the amplifier output transfer function. Varying gain of the VGA provides for a varying resolution in the VGA amplifier output transfer function. This variation allows for compatibility of a single CDMA handset with different industry standards.
    Type: Grant
    Filed: October 11, 2000
    Date of Patent: April 1, 2003
    Assignee: Skyworks Solutions, Inc.
    Inventors: Sabah Khesbak, Madhukar Reddy
  • Power amplifier driver system for wireless handset
    Patent number: 6339361
    Abstract: A driver system for a power amplifier in a wireless communication handset. The driver system includes a driver and a current source. The driver drives the power amplifier at a level of linearity determined responsive to a variable input bias current provided by the current source. The current source varies the bias current, and thus the degree of linearity provided, responsive to the desired output power of the handset.
    Type: Grant
    Filed: June 9, 1999
    Date of Patent: January 15, 2002
    Assignee: Conexant Systems, Inc.
    Inventors: Sabah Khesbak, Madhukar Reddy, Pramote Piriyapoksombut, Trevor Robinson
  • Dielectric resonator phase shifting frequency discriminator
    Patent number: 5847620
    Abstract: A dielectric resonator frequency discriminator comprising a microstrip, a single mode dielectric resonator coupled to the microstrip, at least one detector for detecting an RF signal coupled to the microstrip and an RF input for introducing an RF signal coupled to the microstrip.
    Type: Grant
    Filed: January 28, 1997
    Date of Patent: December 8, 1998
    Assignee: Illinois Institute of Technology
    Inventors: Thomas T. Y. Wong, Thomas D. Nagode, Sabah Khesbak