Radio set and frequency converting method therefor

Details Radio set and frequency converting method therefor Radio set and frequency converting method therefor

2005-02-01

2005-02-01

Nguyen, Duc M. (Department: 2682)

Telecommunications

Receiver or analog modulated signal frequency converter

Frequency modifying or conversion

C455S317000, C455S323000, C455S086000

Reexamination Certificate

active

06850750

ABSTRACT:
To obtain a radio set in a direct conversion system so as not to have any undesired influence of a signal of a transmission system on a reception system. In a transmission system, a frequency Flo of a local signal used in a frequency converting process performed by a frequency converter is expressed as (M/N)·Frx by a frequency conversion circuit. Based on the frequency Flo and the transmission frequency Ftx, a intermediate frequency Ftxif of the transmission system is expressed as Ftxif=Flo−Ftx=(M/N)·Frx−Ftx which is an oscillation frequency of a second local oscillator. Therefore, an equation exists as Ftx+Ftxif={(M/N)·Frx−Ftxif}+Ftxif=(M/N)·Frx, although Ftx+Ftxif leak to the reception system. As a result, since it is different from a reception frequency band, no interference wave is generated for a received signal.

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