Disclosed is a method and an apparatus for self-calibrating direct current (DC) offset and
imbalance between orthogonal signals, which may occur in a mobile transceiver. In the …

Abstract Systems and methods for passively calibrating and correcting for I/Q mismatch in a
quadrature receiver without the necessity of modifying the analog portion of the receiver by …

A non-linear pre-distortion engine maintaining constant peak power at its output is
disclosed. The engine includes a compression estimator, a crest factor reduction processor …

US7995645B2 - Apparatus for measuring in-phase and quadrature (IQ) imbalance - Google
Patents US7995645B2 - Apparatus for measuring in-phase and quadrature (IQ) imbalance …

The present general inventive concept relates to apparatuses and/or methods for measuring
an in-phase and quadrature (IQ) imbalance. In one embodiment, a detector can measure an …

(57) ABSTRACT A radio receiver includes an in-phase channel and a quadra ture channel,
the channels being provided in parallel at a respective input with quadrature modulated …

Embodiments of methods, transceiver circuits, and systems can compensate an IQ mismatch
(eg, Tx or Rx) or a carrier leakage using a plurality of local oscillators. One embodiment of a …

To more efficiently compensate for modulation imbalance, a mobile device modulates and
demodulates a calibration tone and generates digital data representing modulation …

An apparatus and method for correcting IQ imbalance are presented. An exemplary receiver
for processing I and Q signals from a tuner includes: a non-decision directed (NDD) …

The present invention relates to an apparatus and a method for measuring an in phase and
quadrature (IQ) imbalance. One embodiment according to the present general inventive con …