Patent ID: 7035341

Claim:
A method for maintaining a desired phase imbalance of 90 degrees between in-phase and quadrature components of a received signal comprising the acts of: generating an RF tone in a transmitter path by applying a DC signal, the RF tone being used to produce a modulated signal, the modulated signal having a phase angle, adjusting the phase angle to determine a peak amplitude for the in-phase component of the received signal; adjusting the phase angle to determine a peak amplitude for the quadrature component of the received signal; adjusting the phase angle to set the amplitudes for the in-phase and quadrature components of the received signal to be approximately equal during transmission, determining if the desired phase imbalance of 90 degrees has been achieved based on an analysis of the in-phase and quadrature components that have the approximately equated amplitudes; and adjusting a second phase angle to achieve the desired phase imbalance of 90 degrees if the desired phase imbalance of 90 degrees has not been achieved wherein the second phase angle is adjusted based on results of the analysis.