Анализ метода подавления нелинейных искажений с помощью огибающей сигнала с учетом фазоамплитудной конверсии в ЛБВ

T-Comm: Телекоммуникации и транспорт. 2012. № 10. С. 130–135.

Shul’ga A.

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. Describes the various options to include compensating signal. Describes the criteria for the use of amplifiers with a traveling wave tube and solid state amplifiers. Several variants to employ the compensating signal using the feedback circuits in the transistor amplifiers and variations in the electron beam current in TWT (modulation beam current) 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 to 19 dB corresponds to the known experimental data on the microwave transistor amplifier feedback on the frequency of the envelope. Separately, it was the influence on the level of performance fazoamplitudnoy distortion at the output of the microwave amplifier with a traveling wave tube.

Keywords: квазистационарный метод, quasistationary method, усилитель СВЧ, огибающая сигнала, Microwave amplifier, amplitude response, phase amplitude response, intermodulation distortions (IMD), signal envelope, relative level of intermodulation distortions, premodulation of electron beam current, амплитудная характеристика, фазоамплитудная характеристика, интермодуляционные искажения (ИМИ), относительный уровень комбинационных составляющих, премодуляция тока электронного пучка, электровакуумные приборы сверхвысоких частот