Patent ID: 8467755

Claim:
A tuner, comprising: a pre-select filter configured to receive a plurality of channels, and to output a Radio Frequency (RF) signal based on the received plurality of channels; a local oscillator configured to generate a control signal having a tunable frequency; an image reject mixer configured to down-convert the RF signal, and to generate an in-phase component signal and a quadrature component signal based on the tunable frequency of the control signal; and a polyphase filter configured to select a selected channel from the received plurality of channels based on the in-phase component signal and the quadrature component signal, wherein the tunable frequency is within a frequency band of the RF signal, and wherein the local oscillator is configured to generate a test signal having a test frequency based on a frequency of the selected channel, wherein an imbalance between an amplitude response of the in-phase component signal and an amplitude response of the quadrature component signal is determined based on the test signal.