Patents by Inventor Shahriar Rokhsaz

Shahriar Rokhsaz 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).

  • Data detection circuit
    Patent number: 6055283
    Abstract: A pre-amplifier circuit, which may be used in a variety of data recovery circuits to accurately recover data transmissions, includes an input regulatory circuit, a feedback circuit, and an amplifier. The input regulatory circuit regulates the magnitude of the data signal provided to the amplifier based on feedback signals from a feedback circuit. For low level data signals, the input regulatory circuit provides a full, or almost full, representation of the data signal to the amplifier for amplification. But, when the data signal levels increase, the input regulatory circuit attenuates, based on the feedback signals, the data signals more and more before providing them to the amplifier, such that the output of the amplifier stays within a certain range.
    Type: Grant
    Filed: November 23, 1998
    Date of Patent: April 25, 2000
    Assignee: Sigmatel, Inc.
    Inventors: Mathew A Rybicki, H. Spence Jackson, Shahriar Rokhsaz
  • Method and apparatus for a data detection circuit operating from a low voltage power source
    Patent number: 5933040
    Abstract: A method and apparatus for detecting pulse data is accomplished by a low voltage data detection circuit that includes a preamplifier circuit, an amplification stage, and a scaling circuit. The preamplifier circuit has a differential input, a predefined gain, and a maximum output limit and receives an input signal, which has a wide dynamic range. The preamplifier circuit amplifies the input signal based on the predefined gain to produce a preamplified data signal. The preamplified data signal is again amplified by the amplification stage and subsequently provided to the scaling circuit which scales the amplified data signal to a predetermined level. The resulting scaled data signal maintains the pulse width fidelity of the input data signal.
    Type: Grant
    Filed: June 9, 1997
    Date of Patent: August 3, 1999
    Assignee: Sigmatel, Inc.
    Inventors: Shahriar Rokhsaz, Mathew A. Rybicki, H. Spence Jackson
  • Data detection circuit having a pre-amplifier circuit
    Patent number: 5892800
    Abstract: A pre-amplifier circuit, which may be used in a variety of data recovery circuits to accurately recover data transmissions, includes an input regulatory circuit, a feedback circuit, and an amplifier. The input regulatory circuit regulates the magnitude of the data signal provided to the amplifier based on feedback signals from a feedback circuit. For low level data signals, the input regulatory circuit provides a full, or almost full, representation of the data signal to the amplifier for amplification. But, when the data signal levels increase, the input regulatory circuit attenuates, based on the feedback signals, the data signals more and more before providing them to the amplifier, such that the output of the amplifier stays within a certain range.
    Type: Grant
    Filed: March 20, 1997
    Date of Patent: April 6, 1999
    Assignee: Sigmatel, Inc.
    Inventors: Mathew A. Rybicki, H. Spence Jackson, Shahriar Rokhsaz