Radio receiver
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United States of America Patent
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Oct 10, 2006
Issued Date -
N/A
app pub date -
Sep 2, 2005
filing date -
Nov 24, 2000
priority date (Note) -
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Abstract
A radio receiver is configurable to operate in both low-IF and zero-IF modes with maximum re-use of of analogue and digital circuitry between modes. The receiver 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 (516) for performing image rejection filtering.In the low-IF mode, one of the outputs (Q) of the filter (516) is terminated, the other (I) is digitised by a non-complex ADC (520), then the digital signal is filtered and decimated. Quadrature-related IF signals are then re-generated before down-conversion and demodulation.In the zero-IF mode, both outputs of the filter (516) are digitised and processed in parallel before demodulation.By enabling analogue-to-digital conversion and channel filtering to be performed at low-IF on non-complex signals, use of just two non-complex ADCs (120,1620) is possible, thereby avoiding duplication of circuitry and providing significant power savings.
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