DEVICES FOR DEMODULATION OF PHASE-MODULATED RADIO FREQUENCY SIGNALS Russian patent published in 2008 - IPC H03D3/26 

FIELD: radio communication.

SUBSTANCE: in device of demodulation of phase-manipulated and phase-modulated (PM) signals connected between source of PM signals and low-frequency (LF) load and consisting of converter of PM signals into amplitude-phase modulation signal, quadripole, non-linear element, low-pass filter, as non-linear element dipole element is used. Converter of PM signals to APM signal is arranged in the form of this non-linear element, type of which is selected so that the left or right slopes of dependence of conductivity from frequency coincide with frequency of carrying oscillation of PM signals. Non-linear element is connected between quadripole and introduced HF load into longitudinal circuit. If the left slope of mentioned dependence is selected as LF load, integrating circuit is used, and if the right slope is selected, then differentiating circuit is used. Quadripole is made of resistive dipoles, at least two, parameters of which are selected based on condition of provision of required values of amplitudes in two conditions and depth of amplitude modulation of APM signal.

EFFECT: higher noise immunity of receiver.

10 cl, 9 dwg