Patents by Inventor Daniel J. Ferris

Daniel J. Ferris 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).

  • Method and apparatus for providing non 2:1 Gilbert cell mixer
    Patent number: 7161406
    Abstract: A method and apparatus for providing non 2:1 current in a Gilbert cell mixer is disclosed. The Gilbert cell mixer provides lower voltage operation, lower LO drive and better linearity. Additional current sources are provided to drive the lower, source-coupled transistor pair thereby allowing operation of the switch transistors with lower current.
    Type: Grant
    Filed: April 15, 2004
    Date of Patent: January 9, 2007
    Assignee: Xilinx, Inc.
    Inventor: Daniel J. Ferris
  • Method and apparatus for locally regulated circuit
    Patent number: 7019562
    Abstract: According to one embodiment, a locally regulated circuit regulates current flows (IREG and IRG) through the operation of a current mirror (334, 332, 326). The regulated current flows are used to self-generate a common mode voltage (V422) at node (322) and to produce the required bias signals through input stage (302 and 308) and output stage (314 and 316) in response to data input signals (D and D-complement). Cancellation of common mode voltage variation is further enhanced by generating a supplemental current in response to an error signal generated by comparing a desired common mode voltage (VCM) to the actual common mode voltage at node (322). The supplemental current conducted by either of loads (310 and 312) serves to regulate the common mode voltage at node (322).
    Type: Grant
    Filed: December 16, 2003
    Date of Patent: March 28, 2006
    Assignee: Xilinx, Inc.
    Inventor: Daniel J. Ferris