Patent ID: 7995645
Filing Date: 2011-08-09
Classification: H03D,H04L

Abstract:
1. An apparatus for measuring an in-phase and quadrature (IQ) imbalance, the apparatus comprising: a signal generator to provide a first IQ signal of a DC component during a first period and the first IQ signal of a first angular frequency during a second period; an IQ up-conversion mixer to up-convert the first IQ signal by a second angular frequency during the first period and up-convert the first IQ signal by a third angular frequency during the second period to output a second IQ signal; an IQ down-conversion mixer to down-convert a sum of an I component and a Q component of the second IQ signal by the third angular frequency to output a third IQ signal; and an IQ imbalance detector to obtain an Rx IQ imbalance from the third IQ signal during the first period and a Tx/Rx IQ imbalance from the third IQ signal during the second period.