Patent ID: 8229028

Claim:
A method for measuring a Tx in-phase and quadrature (IQ) imbalance generated in an IQ up-conversion mixer and an Rx IQ imbalance generated in an IQ down-conversion mixer, the method comprising: (a) measuring a first IQ imbalance corresponding to the Rx IQ imbalance+the Tx IQ imbalance; (b) measuring a second IQ imbalance corresponding to the Rx IQ imbalance−the Tx IQ imbalance; and (c) obtaining the Tx IQ imbalance and the Rx IQ imbalance from the first IQ imbalance and the second IQ imbalance, wherein the Tx IQ lance and the Rx IQ imbalance obtained in step (c) correspond to equations dg — t =( dg — tr+−dg — tr −)/2; dp — t =( dp — tr+−dp — tr −)/2; dg — r =( dg — tr++dg — tr −)/2; and dp — r =( dp — tr++dp — tr −)/2, where dg_tr+ and dp_tr+ are a gain error and a phase error of the first IQ imbalance, respectively dg_tr− and dp_tr− are a gain error and a phase error of the second IQ imbalance, respectively, dg_t and dp_t are a gain error and a phase error of the Tx IQ imbalance, respectively, and dg_r and dp_r are a gain error and a phase error of the Rx IQ imbalance, respectively.