SYNCHRO-PHASE DEMODULATOR Russian patent published in 2004 - IPC

FIELD: radio engineering. SUBSTANCE: proposed demodulator designed for use in radio receivers to detect frequency- modulated signal and in synchronizers has input phase detector 1 connected to low-frequency filter 2, and also second oscillatory system 3, active element 5, feedback system 6, and parametric component 4 interconnected into series closed circuit to form voltage-controlled generator 11. Output of low- frequency filter 2 is connected to common electrode of parametric component 4 and to second oscillatory system 3. First oscillatory system 8 , newly introduced second active element 10 and second feedback system 9 are connected in series into ring circuit and form synchronized generator 12. Output of active element 10 is connected to second input of phase detector 1. Newly introduced four-terminal shaping network 7 is inserted between first and second oscillatory circuits 8 and 3 and connected to their additional inputs and outputs. EFFECT: enhanced noise immunity and frequency control linearity. 1 cl, 1 dwg