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US 5,963,856 AGranted
Wireless receiver including tunable RF bandpass filter
AssigneeLucent Technologies Inc.
InventorH. H. Kim
Life of this patent
Estimating the term…
Abstract
The wireless receiver band is divided into a plurality of smaller bands using a tunable duplexer to produce a first IF signal of a much lower frequency enabling better unwanted signal filtering using a filter of a certain Q.
Claims16
A wireless receiver comprising
- a switched filter, operable under control of a control signal, for selecting one of a plurality of contiguous frequency sub-bands within the continuous bandwidth of a received modulated radio signal band;
- a single frequency synthesizer for producing a local oscillator signal selected using said control signal;
- a single stage mixer for mixing the selected frequency sub-band of the received radio signal with the selected local oscillator signal to produce one modulated fixed intermediate frequency (IF) signal;
- and
- a detector for detecting the modulated IF signal to recover a baseband signal.
2 more elements
A method of operating a wireless receiver comprising the steps of
- selecting, using a switched filter operable under control of a control signal, one of a plurality of contigious frequency sub-band within the bandwidth of a received modulated radio signal band;
- producing a predetermined local oscillator signal selected using said control signal which when mixed with a carrier signal associated with the selected switched filter produces one modulated fixed intermediate frequency (IF) signal;
- mixing, in a single stage mixer, the selected frequency band of the received modulated radio signal with the selected local oscillator signal to produce the modulated IF signal;
- and
- detecting the modulated IF signal to recover a baseband signal.
2 more elements
Dependencies are inferred from the claim text.