Transmitter/receiver for transmitting and receiving of an RF sig

Details Transmitter/receiver for transmitting and receiving of an RF sig Transmitter/receiver for transmitting and receiving of an RF sig

1997-03-26

1999-04-20

Vo, Nguyen

Telecommunications

Transmitter and receiver at same station

With frequency stabilization

455 86, 455 78, 455 83, 455553, H04B 150

Patent

active

058965629

ABSTRACT:
The object of the invention is a transmitter/receiver for transmitting and receiving of an RF signal in two frequency bands. In the solution according to the invention, a transmitter/receiver is used which is based on direct conversion and in it, when operating in both frequency bands, the mixing frequency is formed by means of the same synthesizer (340). This is implemented preferably in such a way that in the higher operating frequency, the frequency of the output signal of the synthesizer is used as such as a mixing frequency and when operating in the lower operating frequency, a mixing frequency is used which is obtained by dividing the frequency of the output signal of the synthesizer by two or a larger integer in the divider (311, 361). When the solution according to the invention is used, many synthesizers are not needed in the transmitter/receiver and no intermediate frequency components are needed.

REFERENCES:
patent: 4320531 (1982-03-01), Dimon
patent: 4965852 (1990-10-01), Sasaki
patent: 5091919 (1992-02-01), Kuisma
patent: 5123031 (1992-06-01), Kuisma
patent: 5448762 (1995-09-01), Ward
patent: 5564076 (1996-10-01), Auvray
patent: 5610559 (1997-03-01), Dent
patent: 5715525 (1998-02-01), Tarusawa et al.
patent: 5722053 (1998-02-01), Kornfeld et al.
patent: 5734970 (1998-03-01), Saito
Microwave Engineering Europe, Jan. 1993, pp. 59,60,63.
Microwave Engineering Europe, May 1993, pp. 53,54,57,58.

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