FIELD: physics.
SUBSTANCE: modulation and demodulation apparatus is made from a matching two-port network, a two-electrode nonlinear element, a high-frequency load and a low-pass filter; in demodulation mode, the nonlinear element is used to breakdown the spectrum of amplitude-modulated signals; their amplitude-modulation factor is corrected; the low-pass filter is used to select the information-bearing low-frequency signal whose amplitude varies according to the law of variation of the amplitude of the high-frequency signal; the two-port network is made from at least three reactive impedors, wherein the two-electrode nonlinear element is connected between the high-frequency signal source and the two-port network in a cross circuit; in modulation mode, the amplitude of the high-frequency signal is varied according to the law of variation of the amplitude of the control signal.
EFFECT: generation of required amplitude-shift keyed or amplitude-modulated signals, as well as demodulation of said types of signals by realising given ratios of moduli of transmission coefficients in two states of the nonlinear element.
2 cl, 5 dwg
