Synthesis of Polynomial Compensators for Suppression of Low－Frequency Noises in Electronic Devices

摘要

The effect of two disturbing sources with close frequencies on a nonlinear circuit is investigated, because it is shown that low-frequency oscillations occur frequently in such a circuit. These low-frequency oscillations represent a significant threat to the electronic equipment, since standard filters do not suppress such low-frequency harmonics. As the source of low-frequency disturbance is the nonlinearity of the electronic system characteristic, the disturbance compensation is possible by means of linearization of this characteristic. Linearization of the characteristic is suggested to be carried out by synthesis of cascade connection of the initial electronic system and a compensation circuit. The electronic system nonlinear operator is represented in the form of Volterra polynomial, and the operator of the compensation circuit is designed so as to exclude nonlinear functionals from Volterra polynomial. As a result, the resultant circuit (cascade connection of the electronic system and the compensation circuit) is presented by a linear operator. Presented results of compensation of the detector nonlinear transformations illustrate the efficiency of the suggested method for the suppression of low-frequency disturbances.