Patent ID: 8515379

Claim:
A receiver comprising: a mixer for mixing a radio frequency signal and a local oscillator signal so as to generate a base band signal; a low pass filter coupled electrically to the mixer for receiving the base band signal therefrom and for performing low pass filtering upon the base band signal; an analog-to-digital converter coupled electrically to the low pass filter for receiving and converting an output of the low pass filter into a corresponding digital signal; a detecting unit for generating from the base band signal a detection signal that represents an extent of local oscillation leakage or in-phase/quadrature-phase (I/Q) mismatch, wherein the detecting unit includes a fast Fourier transformer for performing fast Fourier transform upon the output of the analog-to-digital converter so as to generate the detection signal; and an adjusting unit coupled electrically to said mixer for outputting a control signal thereto to control a current operating state of said mixer, said adjusting unit being further coupled electrically to said detecting unit, and determining whether there is a reduction in the extent of local oscillation leakage or I/Q mismatch based on the detection signal from said detecting unit; wherein said adjusting unit maintains an adjusting direction for the control signal upon determining that the extent of local oscillation leakage or I/Q mismatch is reduced, reverses the adjusting direction upon determining that the extent of local oscillation leakage or I/Q mismatch is not reduced, and adjusts the control signal according to the adjusting direction.