Patents by Inventor Cristian Andreev

Cristian Andreev 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).

  • CIRCUITS AND METHODS FOR CURRENT SENSING
    Publication number: 20120249098
    Abstract: A circuit includes a first resistor, a second resistor, a voltage follower and a current mirror. The first resistor converts a current flowing through the first resistor to a voltage drop between positive and negative sides of the first resistor. The second resistor is coupled to the negative side of the first resistor. The voltage follower is coupled to the positive side of the first resistor via a non-inverting terminal, and coupled to the negative side of the first resistor through the second resistor via an inverting terminal to cause a voltage at the inverting terminal to follow a voltage at the non-inverting terminal. The current mirror is coupled to the voltage follower to provide a sensing current proportional to the current flowing through the first resistor.
    Type: Application
    Filed: June 12, 2012
    Publication date: October 4, 2012
    Applicant: O2Micro, Inc.
    Inventors: Serban Mihai POPESCU, Cristian ANDREEV
  • Circuits and methods for current sensing
    Patent number: 8232784
    Abstract: A current sensing circuit includes a first resistor, a second resistor and a sense amplifier. The first resistor converts a current flowing through the first resistor to a voltage drop between positive and negative sides of the first resistor. The second resistor is coupled to the negative side of the first resistor. The sense amplifier is coupled to the positive side of the first resistor via a first pin of the sense amplifier, and coupled to the negative side of the first resistor through the second resistor via a second pin of the sense amplifier. The sense amplifier employs a negative feedback to generate a sensing current proportional to the current flowing through the first resistor.
    Type: Grant
    Filed: March 18, 2009
    Date of Patent: July 31, 2012
    Assignee: O2Micro, Inc
    Inventors: Serban Mihai Popescu, Cristian Andreev
  • CIRCUITS AND METHODS FOR CURRENT SENSING
    Publication number: 20100066321
    Abstract: A current sensing circuit includes a first resistor, a second resistor and a sense amplifier. The first resistor converts a current flowing through the first resistor to a voltage drop between positive and negative sides of the first resistor. The second resistor is coupled to the negative side of the first resistor. The sense amplifier is coupled to the positive side of the first resistor via a first pin of the sense amplifier, and coupled to the negative side of the first resistor through the second resistor via a second pin of the sense amplifier. The sense amplifier employs a negative feedback to generate a sensing current proportional to the current flowing through the first resistor.
    Type: Application
    Filed: March 18, 2009
    Publication date: March 18, 2010
    Inventors: Serban Mihai POPESCU, Cristian ANDREEV