FREQUENCY SYNTHESISER Russian patent published in 2010 - IPC H03L7/18 

FIELD: radio engineering.

SUBSTANCE: frequency synthesiser includes two frequency phase detectors, two low-pass filters, voltage-controlled generator, two dividers with variable division factor, buffer cascade, two synchronism indicators, coincidence circuit, D flip-flop, shaper of control signal and amplifier with controlled amplification factor, two-mode self-oscillator, control unit, key, switch from two directions, storage unit and signal source of reference frequency.

EFFECT: considerable increase of quick action when switching the frequencies together with high purity of spectrum of output signal.

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