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US 7,116,965 B2Granted
Radio receiver
AssigneeKoninklijke Philips Electronics N.V.
InventorsBrian J. Minnis, Paul A. Moore
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AssigneeKoninklijke Philips Electronics N.V.
InventorsBrian J. Minnis, Paul A. Moore
Estimating the term…
A radio receiver configurable to operate in either a low-IF or a zero-IF mode comprises a quadrature down-converter (108,110,112,114) for generating in-phase (I) and quadrature (Q) signals at an intermediate frequency and a complex filter (202) for performing image rejection filtering. One of the outputs (Q) of the filter (202) is terminated, the other (I) is passed to a non-complex ADC (206). The output from the ADC is processed digitally then a quadrature signal generator (212,214) generates quadrature-related IF signals which are passed to a down-converter (216,218) for conversion to baseband signals. By enabling analogue-to-digital conversion and channel filtering to be performed at IF on non-complex signals, significant power savings are possible. Further, the flexibility of the receiver is enhanced, enabling it to operate efficiently in both low-IF and zero-IF modes.
A radio receiver comprising an input for a radio frequency signal, quadrature down-conversion means for translating the radio frequency signal to an intermediate frequency and for generating in-phase and quadrature versions of the intermediate frequency signal which is capable of having a zero or a nonzero value, complex filtering means for operating on the in-phase and quadrature signals to provide filtered in-phase and quadrature signals, analogue-to-digital conversion means for digitising only one of the in-phase and quadrature signals, means for performing digital signal processing on the digitised signal and signal generation means for operating on the processed signal to generate digital in-phase and quadrature signals.
Dependencies are inferred from the claim text.