METHOD OF AMPLIFICATION AND DEMODULATION OF FREQUENCY-MODULATED SIGNALS AND DEVICE FOR ITS IMPLEMENTATION Russian patent published in 2016 - IPC H01P1/00 

FIELD: radio engineering, communication.

SUBSTANCE: method of amplification and demodulation of frequency-modulated signals and the device for the method implementation are offered. The device of amplification and demodulation of frequency-modulated signals is formed by DC power supply, direct transmission circuit in the form of triple-pole nonlinear element, four-pole network, external feedback circuit, low pass filter, separating capacitance and low-frequency load, while the four-pole network is resistive, the external feedback circuit is an arbitrary complex four-pole network connected to triple-pole nonlinear element using parallel-series circuit, the triple-pole nonlinear element and feedback circuit as a single unit are in cascade manner are connected between the frequency-modulated signal source with a complex resistance and input of resistive four-pole network, between output of the resistive four-pole network and the low pass filter the high-frequency load in the form of compound two-pole network with the complex resistance z_l is connected, which is formed by series connected the first resistive two-pole network with the resistance R₁, the capacitor with the capacitance C, arbitrary compound two-pole network with the resistance Z₀ = R₀+jX₀ and parallel connected among themselves the second resistive two-pole network with the resistance R₂ and the coil with the inductance L; R₁, R₂, L, C parameters are selected from the condition of matching by the criterion of simultaneous providing of amplification and frequency demodulation according to the given mathematical expressions.

EFFECT: increase of dynamic range and quasilinear section of the frequency demodulation characteristic due to presence of resistive four-pole network and matching using the compound complex two-pole network used as high-frequency load, by criterion of formation of quasilinear section of the left slope of AFC coinciding with the range of change of frequency of input FMS.

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