Patent ID: 6661852
Filing Date: 2003-12-09
Classification: H03D,H04L

Abstract:
A correction circuit for quadrature tuner error correction, the correction circuit receiving a digital in-phase signal and a digital quadrature signal from a quadrature tuner, the correction circuit comprising:an in-phase summer receiving the digital in-phase signal and an in-phase offset estimate, and subtracting the in-phase offset estimate from the in-phase signal, and generating an offset corrected in-phase signal; an in-phase feedback loop responsive to the output of the in-phase summer and adapted to generate the in-phase offset estimate, the in-phase feedback loop further comprising an offset correction value controller receiving a control input and operable to control levels of the in-phase offset estimate; a quadrature summer receiving the digital quadrature signal and a quadrature offset estimate, and subtracting the quadrature offset estimate from the digital quadrature signal, and generating an offset corrected quadrature signal; and a quadrature feedback loop responsive to the output of the quadrature summer and adapted to generate the quadrature offset estimate, the quadrature feedback loop, further comprising an offset correction controller receiving a control input and operable to control levels of the quadrature offset estimate.