Patent ID: 8064863

Claim:
A receiver comprising: a receiver front-end having a radio frequency (RF) input and a quadrature output; and an image rejection calibration system adapted to: apply a first test signal to the RF input of the receiver front-end; obtain first measurements of a quadrature output signal output at the quadrature output of the receiver front-end while the first test signal is applied to the RF input of the receiver front-end; apply a second test signal that is approximately 90 degrees out-of-phase with the first test signal to the RF input of the receiver front-end; obtain second measurements of the quadrature output signal output at the quadrature output of the receiver front-end while the second test signal is applied to the RF input of the receiver front-end; determine an amplitude error and a phase error of the receiver front-end based on the first and second measurements; and apply an amplitude correction and a phase correction to the receiver front-end to correct for the amplitude error and the phase error of the receiver front-end.