Flicker noise or fluctuation drift of the working point

Abstract

An original scheme is proposed for generator of chaos oscillations of the microwave wavelength range. Generator contains nonlinear positive feedback amplifieran and inertial converter of the output signal of a nonlinear amplifier, the signal of which modulates the supply voltage of the active element (transistor). In the case when the value of the inertia parameter of the inertial converter becomes less than 0,06, the generator demonstrated chaotic behavior. An experimental model of a chaotic signal generator based on a powerful transistor 2T982A-2 was created. The generator was created using hybrid microstrip technology on the material FLAN-10 with a thickness of 1 mm. The inertial converter circuit contained a diode performing half-wave conversion of a part of the generator output signal and an RC circuit with a time constant equal to 0,05 of the time one oscillation at the central frequency of the generator. The signal from the output of the inertial converter was applied to the emitter power supply circuit of the transistor. Modulation of the supply voltage led to the fact that the output signal of the generator was a sequence of non-repeating oscillation trains with a random duration and a random initial phase. The frequency band of the generated chaos with an uneven power spectrum of 4 dB occupied a frequency range from 3,1 to 3,3 GHz with an integrated power of 1,2 W. The averaged spectral density of noise oscillations was 6 10-3 W/MHz. Generator efficiency 15%.