| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a device for flexible wideband frequency transposition, and a satellite remote control receiver. <P>SOLUTION: The present invention provides a double frequency transposition device 501 comprising a frequency control device 500 enabling control of local oscillation frequencies FOL1 and FOL2. The frequency control device 500 determines suitable frequencies of each frequency synthesizer 106, 107 in order to be able to cover the entire desired frequency band continuously. The forbidden bands of the first frequency synthesizer 106, which is a fractional synthesis local oscillator, are avoided by an appropriate change of the frequency of the second frequency synthesizer 107, which is adapted to generate at least two separate frequencies FOL2,A and FOL2,B, the frequency difference is strictly greater than the width of the forbidden band. The second synthesizer 107 may be an integer synthesis local oscillator, or may be a fractional synthesis local oscillator. <P>COPYRIGHT: (C)2012,JPO&INPIT |
