FREQUENCY- OR PHASE-MODULATED FREQUENCY SYNTHESIZER Russian patent published in 2006 - IPC H03C3/09 

FIELD: radio engineering.

SUBSTANCE: proposed frequency synthesizer that can be used as broadband frequency or phase modulated transmitter exciter and depends for its operation on automatic pulse-phase frequency control is characterized in uniform modulating characteristics within broad band of output frequencies noted both during frequency and phase modulation within and beyond bandwidth of automatic pulse-phase frequency control system. Proposed circuit arrangement makes it possible to essentially improve quality of frequency or phase modulation with steady parameters as it incorporates provision for complete elimination of phase error signal at output of phase-frequency detector due to impact of correcting signal at low-pass filter input.

EFFECT: enhanced reliability of phase or frequency modulation along with high speed of device.

1 cl, 7 dwg