Transmitter/receiver for transmitting and receiving of an RF signal in two frequency bands
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United States of America Patent
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Apr 20, 1999
Grant Date -
N/A
app pub date -
Mar 26, 1997
filing date -
Apr 1, 1996
priority date (Note) -
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status (Latency Note)
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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.
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