A filter comprising: an adjustable filter; a plurality of switches (18, 20, 26, 32, 40); a reference oscillator that provides an input signal to the adjustable filter during calibration, the adjustable filter including an adjustable bandpass filter (16, 28) and an adjustable notch filter (24, 34); a power detector that detects power of an output signal of the adjustable bandpass filter (16, 28) or the adjustable notch filter (24, 34) under calibration and provides a second signal in response thereto; and characterized in that the filter further comprises a control processor that sets one or more parameters of the adjustable filter in response to the second signal to (i) calibrate the adjustable bandpass filter (16, 28) in accordance with the detected power, wherein during calibration the adjustable bandpass filter (16, 28) is selectively switched out of the adjustable filter by the one or more switches (18, 20, 26, 32, 40) while the remainder of the adjustable filter is disabled and the adjustable bandpass filter (16, 28) is switched to a notch filter type characteristic during the calibration, and (ii) calibrate the adjustable notch filter (24, 34) in accordance with the detected power, wherein during calibration the adjustable notch filter (24, 34) is selectively switched out of the adjustable filter by the one or more switches (18, 20, 26, 32,40) while the remainder of the adjustable filter is disabled and the adjustable notch filter (24, 34) is switched to a bandpass filter type characteristic during the calibration. an adjustable filter; a plurality of switches (18, 20, 26, 32, 40); a reference oscillator that provides an input signal to the adjustable filter during calibration, the adjustable filter including an adjustable bandpass filter (16, 28) and an adjustable notch filter (24, 34); a power detector that detects power of an output signal of the adjustable bandpass filter (16, 28) or the adjustable notch filter (24, 34) under calibration and provides a second signal in response thereto; and characterized in that the filter further comprises a control processor that sets one or more parameters of the adjustable filter in response to the second signal to (i) calibrate the adjustable bandpass filter (16, 28) in accordance with the detected power, wherein during calibration the adjustable bandpass filter (16, 28) is selectively switched out of the adjustable filter by the one or more switches (18, 20, 26, 32, 40) while the remainder of the adjustable filter is disabled and the adjustable bandpass filter (16, 28) is switched to a notch filter type characteristic during the calibration, and (ii) calibrate the adjustable notch filter (24, 34) in accordance with the detected power, wherein during calibration the adjustable notch filter (24, 34) is selectively switched out of the adjustable filter by the one or more switches (18, 20, 26, 32,40) while the remainder of the adjustable filter is disabled and the adjustable notch filter (24, 34) is switched to a bandpass filter type characteristic during the calibration. (i) calibrate the adjustable bandpass filter (16, 28) in accordance with the detected power, wherein during calibration the adjustable bandpass filter (16, 28) is selectively switched out of the adjustable filter by the one or more switches (18, 20, 26, 32, 40) while the remainder of the adjustable filter is disabled and the adjustable bandpass filter (16, 28) is switched to a notch filter type characteristic during the calibration, and (ii) calibrate the adjustable notch filter (24, 34) in accordance with the detected power, wherein during calibration the adjustable notch filter (24, 34) is selectively switched out of the adjustable filter by the one or more switches (18, 20, 26, 32,40) while the remainder of the adjustable filter is disabled and the adjustable notch filter (24, 34) is switched to a bandpass filter type characteristic during the calibration.