Method, system and apparatus for balanced frequency up-conversion of a baseband signal

  • US 8,571,135 B2
  • Filed: 12/12/2011
  • Issued: 10/29/2013
  • Est. Priority Date: 04/16/1999
  • Status: Expired due to Term
First Claim
Patent Images

1. A method for up-converting a baseband signal, to a higher frequency signal comprising the steps for:

  • (1) receiving the baseband signal;

    (2) using first and second control signals, each having a single fundamental frequency, the first and second control signals being phase shifted from one another, and each control signal having variable pulse widths, to differentially sample the baseband signal to generate both I and Q harmonically rich signals each containing a plurality of harmonic images, the I and Q harmonically rich signals each being a function of information of the baseband signal;

    (3) controlling the amplitude of each harmonically rich signal by adjusting the variable pulse widths of the first and second control signals;

    (4) combining corresponding portions of harmonic images for the harmonically rich signals and then filtering the combined result for a selected harmonic frequency to obtain an up-converted signal;

    (5) selecting a desired harmonic from said harmonic images; and

    (6) transmitting said desired harmonic over a communications medium.

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