FREQUENCY SYNTHESIZER HAVING MODULATION DEVIATION CORRECTION VIA PRESTEERING STIMULUS

摘要

A FREQUENCY SYNTHESIZER (10) HAVING A DIGITAL TO ANALOG CONVERTER (DAC) (40) AND A FEEDBACK SYSTEM WHICH DETECTS THE DEVIATION OF A FREQUENCY MODULATED SIGNAL AND ALIGNS THE DETECTED DEVIATION. DAC (40) PROVIDES A PRESTEERING STIMULUS FOR ALIGNMENT PURPOSES. AFTER PRESTEERING ALIGNMENT, THE GAIN OF DAC (40) IS ACCURATELY SET OF FREQUENCY DEVIATION BECAUSE MODULATION IS SOURCED FROM THE SAME DIGITAL TO ANALOG CONVERTER THAT PERFORMS PRESTEERING.(FIGURE 1)