Patent ID: 8018990

Claim:
A phase error detector to measure an in-phase and quadrature (IQ) imbalance error using a first IQ signal including a first tone having at a first angular frequency and a second tone having a second angular frequency, the second tone corresponding to an image signal by the IQ imbalance of the first tone, the detector comprising: one or more of: a circuit, a digital signal processor (DSP), or a microcontroller unit (MCU), the circuit, DSP, and/or MCU configured to include: a derotator to derotate the first IQ signal by the first angular frequency to obtain a second IQ signal and to derotate the first IQ signal by the second angular frequency to obtain a third IQ signal; a DC estimator to obtain a fourth IQ signal corresponding to a DC component of the second IQ signal and a fifth IQ signal corresponding to a DC component of the third IQ signal; and a controller to determine a first error by the IQ imbalance from the fourth IQ signal and the fifth IQ signal.