Patent ID: 7969254
Filing Date: 2011-06-28
Classification: G01R,H03C,H04L

Abstract:
1. A method for calibrating a quadrature modulator (QM), the method comprising: (a) defining an image to signal ratio (ISR) characteristic of the QM as a function of: (b) setting a baseband offset frequency for the QM; (c) setting a carrier frequency for the QM; (d) measuring a current ISR of the QM to obtain a first ISR value; (e) defining a gain parameter based on the first ISR value; (f) altering a system gain imbalance of the QM according to the gain parameter; (g) measuring the current ISR of the QM subsequent to said altering to obtain a second ISR value; and (h) obtaining the EGI of the QM from the first ISR value and the second ISR value.