| 摘要 |
<p>The invention relates to a synthesizer arrangement for generating signals simultaneously, the arrangement comprising as an input a frequency reference signal (FREF) generated with stable crystal oscillator means (XO). The arrangement comprises first synthesizer means (115, 400) arranged to generate a first signal (FLO1, FLO) independently of the frequency reference signal (FREF), and as their input a first control signal (116, FCOR) controlling the generation, on the basis of which the first signal is modified independently, and second synthesizer means (209, 400) arranged to generate a second signal (FLO1, FLO) independently of the frequency reference signal (FREF), and as their input a second control signal (210, FCOR) controlling the generation, on the basis of which the second signal is modified independently. The first and the second synthesizer means (115, 209, 400) comprise a digital fractional-N frequency divider (403) for feedback, the frequency divider (403) being controlled with a bit word (404) which is arranged to be generated by means of a digital sigma-delta calculation circuit (405), whose input (FCOR) is one of said first and second control signals (116, 210), which is for example a frequency correction signal (116) or a frequency transfer signal (210). <IMAGE></p> |
