Telecommunications – Transmitter and receiver at same station – With a common signal processing stage
Patent
1997-03-24
1999-10-26
Le, Thanh Cong
Telecommunications
Transmitter and receiver at same station
With a common signal processing stage
455 76, 455118, H04B 140
Patent
active
059743026
ABSTRACT:
A transceiver operable in both the cellular and PCS frequency bands which uses a single voltage controlled local oscillator in an intermediate frequency stage for both the cellular and PCS signals. The oscillator is operative for upconverting transmitter signals and downconverting receive signals for both cellular operation and PCS operation. A second voltage controlled local oscillator in a stage between the transceiver antenna and the intermediate frequency stage is operative for only PCS operation to upconvert PCS transmitter signals and to downconvert PCS receive signals. This is accomplished by the use of a switchable intermediate frequency local oscillator in the transmitter path of both the cellular and PCS signals.
REFERENCES:
patent: 5390363 (1995-02-01), Mirtich et al.
patent: 5519885 (1996-05-01), Vaisanen
patent: 5689817 (1997-11-01), Fok
patent: 5722053 (1998-02-01), Kornfield et al.
patent: 5732330 (1998-03-01), Anderson et al.
Adamiecki Andrew L.
Garner William J.
Lieu Winston H.
Bhattacharya Sam
Cong Le Thanh
Lucent Technologies - Inc.
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