Patent ID: 8670738

Claim:
An imbalance compensator for correcting a phase/filter mismatch and a gain mismatch between a first signal branch and a second signal branch, one of the first and second signal branches being an in-phase branch, the other of the first and second signal branches being a quadrature branch, the imbalance compensator comprising: a phase/filter mismatch correction circuit, comprising: an adjustable filter, disposed on the first signal branch, the adjustable filter arranged for adjusting a filter coefficient setting according to a first input signal of the first signal branch and a second input signal of the second signal branch, and generating a first compensated signal to the first signal branch according to the filter coefficient setting and the first input signal; and a processing unit, disposed on the second signal branch, the processing unit arranged for processing the second input signal according to the first compensated signal and accordingly generating a second compensated signal; and a gain mismatch correction circuit, arranged for referring to the first and second compensated signals to configure gain compensation, and applying the configured gain compensation to a specific compensated signal being one of the first and second compensated signals.