A radio communication receiver apparatus operable to process multiple radio frequency bands in a telecommunication system, the apparatus comprising: a plurality of digital receiver chains (21 1 to 21 N), wherein each digital receiver chain (21 1 to 21 N) is coupled to receive a digital representation of the multiple radio frequency bands, including a particular radio frequency band for processing by the respective digital receiver chain; wherein each digital receiver chain (21 1 to 21 N) comprises a digital receiver (25 1 to 25 N) that is programmable to select a particular radio frequency band from the digital representation of the multiple radio frequency bands, and adapted to down convert the selected radio frequency band; and a digital processing unit (37 1 to 37 N) coupled to receive an output of each digital receiver (25 1 to 25 N) and configured to process the output of each digital receiver (25 1 to 25 N) to provide a digital baseband output signal (27 1 to 27 N) associated with the particular radio frequency band, wherein the digital processing unit (37 1 to 37 N) forms part of a common digital processing unit that is common to all digital receiver chains (21 1 to 21 N), characterized in that the radio communication receiver apparatus further comprises: a calibration stage (40, 41) adapted, during a calibration mode of operation, to transmit a calibration signal to the input of the receiver apparatus, and adapted to detect a phase, amplitude and/or delay of the calibration signal after being converted to a baseband signal in each digital receiver chain (21 1 to 21 N), the detected signal from each digital receiver chain (21 1 to 21 N) providing a set of feedback signals for use by the calibration stage to define a set of correction parameters, wherein the set of correction parameters are used by the digital processing unit (37 1 to 37 N) to adjust one or more of the phase, amplitude and/or delay of a base band signal in one or more of the digital receiver chains (21 1 to 21 N). a plurality of digital receiver chains (21 1 to 21 N), wherein each digital receiver chain (21 1 to 21 N) is coupled to receive a digital representation of the multiple radio frequency bands, including a particular radio frequency band for processing by the respective digital receiver chain; wherein each digital receiver chain (21 1 to 21 N) comprises a digital receiver (25 1 to 25 N) that is programmable to select a particular radio frequency band from the digital representation of the multiple radio frequency bands, and adapted to down convert the selected radio frequency band; and a digital processing unit (37 1 to 37 N) coupled to receive an output of each digital receiver (25 1 to 25 N) and configured to process the output of each digital receiver (25 1 to 25 N) to provide a digital baseband output signal (27 1 to 27 N) associated with the particular radio frequency band, wherein the digital processing unit (37 1 to 37 N) forms part of a common digital processing unit that is common to all digital receiver chains (21 1 to 21 N), characterized in that the radio communication receiver apparatus further comprises: a calibration stage (40, 41) adapted, during a calibration mode of operation, to transmit a calibration signal to the input of the receiver apparatus, and adapted to detect a phase, amplitude and/or delay of the calibration signal after being converted to a baseband signal in each digital receiver chain (21 1 to 21 N), the detected signal from each digital receiver chain (21 1 to 21 N) providing a set of feedback signals for use by the calibration stage to define a set of correction parameters, wherein the set of correction parameters are used by the digital processing unit (37 1 to 37 N) to adjust one or more of the phase, amplitude and/or delay of a base band signal in one or more of the digital receiver chains (21 1 to 21 N). a calibration stage (40, 41) adapted, during a calibration mode of operation, to transmit a calibration signal to the input of the receiver apparatus, and adapted to detect a phase, amplitude and/or delay of the calibration signal after being converted to a baseband signal in each digital receiver chain (21 1 to 21 N), the detected signal from each digital receiver chain (21 1 to 21 N) providing a set of feedback signals for use by the calibration stage to define a set of correction parameters, wherein the set of correction parameters are used by the digital processing unit (37 1 to 37 N) to adjust one or more of the phase, amplitude and/or delay of a base band signal in one or more of the digital receiver chains (21 1 to 21 N).