FREQUENCY SYNTHESIZER HAVING AUTOMATIC PHASE-LOCK LOOP STARTED BY DIGITAL SYNTHESIZER HAVING DIRECT FREQUENCY SYNTHESIS Russian patent published in 2001 - IPC

FIELD: communication engineering. SUBSTANCE: device has oscillator for shaping variable frequency signal in digital form, the first and the second automatic phase-lock loops, power divider, two switches, adder. Synthesis method involves shaping variable frequency signal in digital form, dividing it by power into two reference signals, filtering variable frequency signal in the first automatic phase-lock loop, delivering the first or the second reference signal depending on switching control signal, to the second automatic phase-lock loop input distinguished by significantly lesser completion time than the first one. EFFECT: accelerated completion time; high spectral purity of signal. 7 cl, 4 dwg