Patent ID: 7010278
Filing Date: 2006-03-07
Classification: H04L

Abstract:
1. A method for correcting a phase imbalance in a quadrature modulator, comprising: applying a first phase and a first voltage level to a first quadrature modulator channel while applying the first voltage level to a second quadrature modulator channel and measuring a first output amplitude; applying the first phase and the first voltage level to the first quadrature modulator channel while applying a second voltage level to the second quadrature modulator channel and measuring a second output amplitude; applying a second phase and the first voltage level to the first quadrature modulator channel while applying the first voltage level to a second quadrature modulator channel and measuring a third output amplitude; applying the second phase and the first voltage level to the first quadrature modulator channel while applying the second voltage level to the second quadrature modulator channel and measuring a fourth output amplitude; determining a phase correction factor as a function of the first, second, third and fourth output amplitudes and the first phase; and correcting the phase imbalance using said gain correction factor.