FREQUENCY SYNTHESISER Russian patent published in 2010 - IPC H03L7/06 

FIELD: radio engineering.

SUBSTANCE: invention may be used as low-noise receiver, which is quickly switched by heterodyne frequency, and in other devices, where fast frequency tuning is required with high purity of output signal spectrum. Device includes source of reference frequency signal, the first and second frequency-phase detectors, the first and second low pass filters, voltage-controlled generator, the first and second frequency dividers with alternating division coefficient, voltage divider, double-mode self-contained generator, memorising unit, switch from two directions, switch, besides it includes serially connected digital potentiometre and non-inverting amplifier, controlled band filter, inverter, the first and second frequency dividers with fixed coefficient of division, microcontroller and indictor of synchronism.

EFFECT: improved purity of outlet signal spectrum and efficiency in process of frequency switching in synthesiser.

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