Patents Represented by Attorney Tim Harrison
  • Patent number: 7142014
    Abstract: An apparatus and method of the present invention includes a high frequency exclusive OR (XOR) with a peaked load stage. The peaked load stage coupled to the XOR produces a peaked response at a specified frequency of operation. The high frequency XOR comprises a mixer stage comprising first and second transconductance stages coupled to produce a differential output current. The peaked load stage receives the differential output current from the mixer stage and provides increasing impedance at a specified frequency of operation. The peaked load stage includes a pair of peaked load blocks comprising a saturation region peaked load MOSFET and a resistive load. The gate-to-source capacitance of the peaked load MOSFET is coupled to the resistive load to form a high pass filter that provides additional bias to a gate of the peaked load MOSFET that increases the resistance of the peaked load MOSFET at the specified frequency.
    Type: Grant
    Filed: November 16, 2004
    Date of Patent: November 28, 2006
    Assignee: Xilinx, Inc.
    Inventors: Eric D. Groen, Charles W. Boecker, William C. Black