Tracking filter for a receiver

An integrated circuit comprising:

• a summer to receive an input signal and a feedback signal and provide a first signal;
• a downconverter to frequency downconvert a second signal derived based on the first signal and provide an output signal;
• a filter to filter the output signal and provide a third signal;
• and
• an upconverter to frequency upconvert the third signal and provide a fourth signal from which the feedback signal is derived.

An apparatus for communication, comprising:

• a tracking filter to filter an input signal and provide a first signal;
• an amplifier to amplify the first signal and provide a second signal;
• and
• a downconverter to frequency downconvert the second signal and provide an output signal, the tracking filter filtering the input signal based on the output signal.

A method of processing an input signal, comprising:

• subtracting a feedback signal from the input signal to obtain a first signal;
• downconverting a second signal derived based on the first signal to obtain an output signal;
• filtering the output signal to obtain a third signal;
• upconverting the third signal to obtain a fourth signal;
• and
• deriving the feedback signal based on the fourth signal.

An apparatus for communication, comprising:

• means for subtracting a feedback signal from an input signal to obtain a first signal;
• means for downconverting a second signal derived based on the first signal to obtain an output signal;
• means for filtering the output signal to obtain a third signal;
• means for upconverting the third signal to obtain a fourth signal;
• and
• means for deriving the feedback signal based on the fourth signal.