Patent ID: 7151917

Claim:
A receiver circuit comprising: an error detection circuit configured to receive a digital signal comprising in-phase (I) and quadrature (Q) components, to combine the digital signal with a complex image correction factor and, dependent upon combining the digital signal with the complex image correction factor, to detect an error in the complex image correction factor; and an error correction circuit coupled to said error detection circuit and configured to modify said complex image correction factor dependent upon said error; wherein to combine the digital signal with the complex image correction factor, the error detection circuit is further configured to: multiply said in-phase component by a value of a first function of a real portion of said complex image correction factor to form a first product; multiply said in-phase component by a value of a first function of an imaginary portion of said complex image correction factor to form a second product; multiply said quadrature component by a value of a second function of the real portion of said complex image correction factor to form a third product; multiply said quadrature component by a value of a second function of the imaginary portion of said complex image correction factor to form a fourth product; accumulate said first and fourth products; and accumulate said second and third products.