Analysis of the Suppression of Nonlinear Distortions in Amplifiers Using the Envelope Signal

摘要

The suppression of the nonlinear distortions in amplifier using the effect of the envelope signal of the amplified HF oscillations on the amplifier parameters is analyzed. A slow (on the time scale of the HF oscillations) variation in the parameters gives rise to additional frequency components of oscillations that compensate for the nonlinear distortions of the original signal. Several variants to employ the compensating signal using the feedback circuits in the transistor amplifiers and variations in the electron-beam current in TWT in the absence of such circuits are considered. The suppression of the nonlinear intermodulation distortions (IMDs) of the test two-frequency signal is studied for the above variants and the suppression of the third-order IMD by 6-19 dB corresponds to the known experimental data on the microwave transistor amplifier. The generalization of the quasi-stationary method for the analysis of the nonlinear transformation of signals allows the analysis of the amplification and suppression of IMD for more complicated multifre-quency signals that are used in radio systems.