Radio receiver

Details Radio receiver Radio receiver

2005-10-11

2005-10-11

Le, Huyen (Department: 2643)

Telecommunications

Receiver or analog modulated signal frequency converter

Frequency modifying or conversion

C455S552100, C455S553100, C455S556100, C375S329000, C375S334000, C375S350000

Reexamination Certificate

active

06954628

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 for generating in-phase (I) and quadrature (Q) signals at an intermediate frequency and a complex filter for performing image rejection filtering. In the low-IF mode, one of the outputs (Q) of the filter is terminated, the other (I) is digitised by a non-complex ADC 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 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 is possible, thereby avoiding duplication of circuitry and providing significant power savings.

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By M.J. Gringell, Entitled: “Single Sideband Modulation Using Sequence Asymmetric Polyphase Networks”, Electronic Communications, No. 48, 1973, pp. 20-25.

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