Patent ID: 7127217
Filing Date: 2006-10-24
Classification: H04B

Abstract:
1. A radio-frequency (RF) receiver having a calibration system for a tunable filter, comprising: a tunable filter for an RF receiver, the tunable filter being configured to be tuned a desired channel by adjusting one or more tuning control signals, the tunable filter being tunable across a frequencv spectrum including a plurality of channels; calibration signal generation circuitry configured to provide an adjustable calibration signal to the tunable filter in a calibration mode of operation, the calibration signal being adjusted based upon the desired channel to be tuned; receive path circuitry configured to receive a filtered signal from the tunable filter during a normal mode of operation and a filtered calibration signal from the tunable filter during a calibration mode of operation, the receive path circuitry being further configured to output a feedback signal representing a parameter associated with the filtered calibration signal during a calibration mode of operation; and calibration control circuitry coupled to receive the feedback signal as an input during a calibration mode of operation and to provide the one or more tuning control signals to the tunable filter, the calibration control circuitry being configured to adjust the one or more tuning control signals based upon the feedback signal to tune the tunable filter with respect to the desired channel; wherein the calibration signal generation circuitry, the receive path circuitry, and the calibration control circuitry are at least in part integrated on the same integrated circuit.