Patent ID: 7853229

Claim:
A calibration component configured to calibrate an automatic gain controller (AGC) of a tuner configured to isolate a selected channel from a multi-channel broadcast signal, the tuner implemented substantially on two chips, the calibration component comprising: a calibration signal generator implemented on a radio frequency (RF) integrated circuit on a first chip, the RF integrated circuit being adapted for RF channel selection processing of the broadcast signal, the calibration signal generator adapted to generate a generally known calibration signal; a power detector implemented on the RF integrated circuit and configured to detect, during calibration, at least one power characteristic of the calibration signal and to provide a power level signal indicative of the at least one detected power characteristic; a gain controller implemented on a digital integrated circuit on a second chip, the digital integrated circuit being adapted for digital channel selection processing of the broadcast signal, the gain controller adapted to generate at least one error signal based, at least in part, on a comparison between the power level signal provided by the power detector and a first reference signal; an offset signal generator implemented on the RF integrated circuit and configured to generate an offset signal based, at least in part, on the at least one error signal; and a summing element implemented on the RF integrated circuit and adapted to combine the offset signal with the power level signal provided by the power detector to provide an adjusted power level signal.