Direct conversion radio transceiver

Details Direct conversion radio transceiver Direct conversion radio transceiver

2007-02-06

2007-02-06

Ramakrishnaiah, Melur (Department: 2614)

Telecommunications

Transmitter and receiver at same station

With transmitter-receiver switching or interaction prevention

C455S076000, C455S260000

Reexamination Certificate

active

10082866

ABSTRACT:
A radio transceiver capable of transmitting and receiving on a common radio channel in a half duplex mode includes a direct conversion transmitter and a low IF receiver. A common signal generator (2, 2′, 2″) comprises a first and second frequency generator (40, 41). The first frequency generator generates a carrier frequency signal which is used by both the transmitter and receiver. During reception, the second frequency generator generates an offset signal at the low IF frequency which is mixed with the carrier frequency signal to form a down conversion signal. During transmission, modulation is applied either directly to the carrier frequency signal in one embodiment, or to the offset signal which is then mixed with the carrier frequency signal to form a modulated carrier frequency signal in another embodiment.

REFERENCES:
patent: 5392460 (1995-02-01), Mattila et al.
patent: 5423076 (1995-06-01), Westergren et al.
patent: 5619154 (1997-04-01), Strolle et al.
patent: 5715520 (1998-02-01), Hillock et al.
patent: 5991605 (1999-11-01), Rapeli
patent: 6404293 (2002-06-01), Darabi et al.
European Patent Application No. 99944448.2 + PHB 34277 filed with the USPTO on Aug. 19, 1999, U.S. Appl. No. 09/377,357, Inventors Paul R. Marshall et al.

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