Patents by Inventor Haiqiao Xiao

Haiqiao Xiao 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).

  • High-frequency active inductor
    Patent number: 7042317
    Abstract: An active inductor circuit implemented in sub-micron CMOS semiconductor technology is usable at gigaHertz frequencies and includes an input node, a non-inverting transconductor circuit comprising a differential pair of NMOS transistors connected to the input node, an inverting transconductor circuit comprising an NMOS transistor connected to an output node of the non-inverting transconductor circuit and connected to the input node in a gyrator feedback configuration. Varactors coupled to the transconductor circuits tune the frequency and Q of the active inductor circuit.
    Type: Grant
    Filed: September 8, 2004
    Date of Patent: May 9, 2006
    Assignee: State of Oregon, acting by and through the Board of Higher Education on behalf of Portland State University
    Inventors: Haiqiao Xiao, Rolf Schaumann, W. Robert Daasch
  • High-frequency active inductor
    Publication number: 20050083151
    Abstract: An active inductor circuit implemented in sub-micron CMOS semiconductor technology is usable at gigaHertz frequencies and includes an input node, a non-inverting transconductor circuit comprising a differential pair of NMOS transistors connected to the input node, an inverting transconductor circuit comprising an NMOS transistor connected to an output node of the non-inverting transconductor circuit and connected to the input node in a gyrator feedback configuration. Varactors coupled to the transconductor circuits tune the frequency and Q of the active inductor circuit.
    Type: Application
    Filed: September 8, 2004
    Publication date: April 21, 2005
    Inventors: Haiqiao Xiao, Rolf Schaumann, W. Daasch