Signal processing device and method

A radio-receiver circuit comprising a processing device for processing an analog complex input signal generated by downconversion of an aggregated-spectrum radio-frequency signal in the radio-receiver circuit, wherein the complex input signal comprises a plurality of sub bands scattered across a total frequency band of the complex input signal, wherein the processing device comprises:

• a plurality of processing paths, wherein each processing path is configured to process an associated sub band and comprises:
• a complex mixer configured to frequency translate the complex input signal, and thereby the associated sub band, based on a local oscillator signal associated with the complex mixer;
• and
• an analog channel-selection filter operatively connected to an output port of the complex mixer and configured to filter an output signal of the complex mixer and pass the frequency translated associated sub band;
• an oscillator unit configured to provide the local oscillator signal associated with the complex mixer of each processing path;
• and
• a control unit configured to receive control data indicating frequency locations of the sub bands and, for each processing path, control the local oscillator signal of the complex mixer of that processing path based on the frequency location of the associated sub band and the passband of the analog channel-selection filter of the processing path, such that the frequency-translated associated sub band appears within a passband of the analog channel-selection filter of the processing path.

An electronic apparatus comprising a processing device for processing an analog complex input signal generated by downconversion of an aggregated-spectrum radio-frequency signal in a radio-receiver, wherein the complex input signal comprises a plurality of sub bands scattered across a total frequency band of the complex input signal, wherein the processing device comprises:

• a plurality of processing paths, wherein each processing path is configured to process an associated sub band and comprises:
• a complex mixer configured to frequency translate the complex input signal, and thereby the associated sub band, based on a local oscillator signal associated with the complex mixer;
• and
• an analog channel-selection filter operatively connected to an output port of the complex mixer and configured to filter an output signal of the complex mixer and pass the frequency translated associated sub band;
• an oscillator unit configured to provide the local oscillator signal associated with the complex mixer of each processing path;
• and
• a control unit configured to receive control data indicating frequency locations of the sub bands and, for each processing path, control the local oscillator signal of the complex mixer of that processing path based on the frequency location of the associated sub band and the passband of the analog channel-selection filter of the processing path, such that the frequency-translated associated sub band appears within a passband of the analog channel-selection filter of the processing path.

A method of processing an analog complex input signal generated by downconversion of an aggregated-spectrum radio-frequency signal in a radio-receiver, wherein the complex input signal comprises a plurality of sub bands scattered across a total frequency band of the complex input signal, and wherein the method comprises

• receiving control data indicating frequency locations of the sub bands;
• and
• for each sub band, processing the sub band in an associated processing path of a plurality of processing paths by:
• providing a local oscillator signal associated with a complex mixer of the associated processing path;
• frequency translating the complex input signal, and thereby the sub band, in the complex mixer of the associated processing path based on the local oscillator signal associated with the complex mixer;
• filtering an output signal of the complex mixer in an analog channel-selection filter of the associated processing path;
• and
• controlling the local oscillator signal of the complex mixer of the associated processing path based on the frequency location of the sub band and the passband of the channel-selection filter of the associated processing path, such that the frequency-translated sub band appears within a passband of the channel-selection filter of the associated processing path.