FIELD: radio engineering, communication.
SUBSTANCE: input signal is transmitted to a demodulator made from a four-terminal nonlinear element, a low-pass filter, a separating capacitor and a low-frequency load; the signal is transmitted to the left slope of the amplitude-frequency characteristic of the demodulator; the nonlinear element is connected in a transverse circuit between the source of the input signal and the input of the four-terminal element. The relationships between elements of the array of resistances of the complex four-terminal element and frequency are selected in accordance with given mathematical expressions. The apparatus has a source of input signals, a four-terminal element, a two-electrode nonlinear element, a low-pass filter, a separating capacitor, a low-frequency load, wherein the four-terminal element is complex and is in form of an overlapped T-shaped connection of four complex two-terminal elements, and values of parameters of the fourth among them are determined in accordance with given mathematical expressions.
EFFECT: wide field of implementation, wider frequency band and high noise-immunity.
2 cl, 4 dwg
