Patent ID: 8335279

Claim:
A method, comprising: coupling, in an integrated circuit comprising multiple tuners, a local oscillator of a first tuner to a mixer input of a second tuner; coupling a local oscillator of the second tuner to a mixer input of the first tuner; generating, via the local oscillators, a calibration tone at the output of the mixer of the first tuner that lies within the passband of a channel filter of the first tuner; generating, via the local oscillators, a second calibration tone at the output of the mixer of the first tuner that lies within the transition region of the channel filter; measuring amplitudes of the output of the channel filter for a plurality of calibration tones; comparing amplitudes of the output of the channel filter of the first tuner to enable adjusting the bandwidth of the channel filter of the first tuner; and adjusting the bandwidth of the channel filter based upon the measuring the amplitudes of the output of the channel filter.