Method of Improving the Shape of Amplitude-Frequency Characteristics of Resonant Radio Frequency Amplifiers with Double Autotransformer Inclusion

Abstract

Features of formation of amplitude-frequency characteristics of resonant amplifier stages with double autotransformer inclusion are considered. The amplitude-frequency characteristic of the resonant cascade was simulated using the Multisim circuit design program. The transfer function of the circuit is analyzed and the factors influencing the formation of the frequency response of the cascade in a wide frequency range are revealed. Attention is drawn to the undesirable distortion of the shape of the amplitude-frequency response of the cascade outside the operating frequency band, leading to a decrease in attenuation and deterioration of selectivity on the side channels of reception. Recommendations are given for improving the shape of the amplitude-frequency characteristics outside the operating frequency band by parallel connection of autotransformers.