IQ gain imbalance correction for receivers employing sigma-delta analog to digital conversion

Patent metadata

Field	Value
Publication number	US-9014306-B2
Application number	US-201113087057-A
Country	US
Kind code	B2
Filing date	Apr 14, 2011
Priority date	Apr 14, 2011
Publication date	Apr 21, 2015
Grant date	Apr 21, 2015

Abstract

Embodiments of an apparatus for improving a gain imbalance between an in-phase and quadrature component recovered by a receiver are provided. The apparatus includes a first transition counter configured to count a number of bit transitions in a first sequence of one-bit values provided by a first sigma-delta modulator based on the in-phase component, and a second transition counter configured to count a number of bit transitions in a second sequence of one-bit values provided by a second sigma-delta modulator based on the quadrature component. The apparatus further includes a gain monitor configured to: (1) determine a first and second power level, proportional to a power of the in-phase and quadrature components respectively, using the number of bit transitions in the first and second sequences, and (2) adjust a gain of one of the in-phase and quadrature components based on a ratio between the first and second power levels.

First claim

What is claimed is:

1. A receiver comprising:
a demodulator configured to demodulate a composite signal with magnitude and phase information into an in-phase component and a quadrature component;
a first sigma-delta modulator configured to convert the in-phase component into a first discrete time signal comprising a first sequence of one-bit values;
a second sigma-delta modulator configured to convert the quadrature component into a second discrete time signal comprising a sec…

Assignees

• Etemadi Farzad
• Broadcom Corp

Inventors

• Etemadi Farzad

Classifications

• H04L27/3863 Primary

  Electricity · mapped topic

• H04L27/08

  Electricity · mapped topic

• H03G3/20 Primary

  Electricity · mapped topic