Patent ID: 6760577
Filing Date: 2004-07-06
Classification: H03D,H04B

Abstract:
A method of aligning an I/Q upconverter for minimizing an unwanted sideband comprising:providing inphase and quadrature signals; upconverting the inphase and quadrature signals using inphase and quadrature components of a carrier frequency to provide representative wanted and an unwanted sidebands; downconverting the output of the upconversion and carrier leakage using a pilot tone having a second frequency as the local oscillator of the downconverter, the difference in the first and second frequencies placing the wanted and not the unwanted sideband and carrier leakage as downconverted at frequencies that may be filtered out with a low pass filter; filtering out the wanted sideband and the carrier leakage; and, adjusting the amplitude of at least one of the inphase and quadrature signals and the phase of at least one of the inphase and quadrature components of the carrier frequency to minimize the unwanted sideband.