RU1806439C - Noise signal generator - Google Patents

Abstract

Use of the invention: radio engineering, electronics, and measurement technology. SUMMARY OF THE INVENTION: a noise signal generator comprises a load 1, a first active multipole 2, a communication element 3, a first subharmonic driver 4, a first oscillatory circuit 5, a first feedback circuit 6, a second active multipole 7, a second subharmonic driver 8, a second feedback circuit coupling 9, the second oscillatory circuit 10 and allows you to generate a noise signal with a uniform spectral density and an extended spectrum. 1 ill.

Description

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The invention relates to the field of radio engineering and electronics and may find application in control and measuring equipment, microwave heating installations, radar, medical and other electronic equipment.

The purpose of the invention is to increase the uniformity of the power spectral density and to expand the spectrum of noise signals.

The drawing shows a structural diagram of the proposed noise generator.

The generator comprises a load 1 connected to the output of the generator and the outputs of the active multi-terminal, the first active multi-terminal 2, the communication element 3, the first subharmonic driver 4, the first oscillatory circuit 5, the first feedback circuit 6, the second active multi-terminal 7, the second subharmonic driver 8, a second feedback circuit 9, a second oscillatory circuit 10.

The noise generator operates as follows.

With little or no connection in each of the systems, consisting of an active multipole 2 or 7 and a series-connected oscillatory circuit 5 or 10 and a feedback circuit 6 or 9, oscillations of the fundamental frequency are excited, and in the subharmonics 4 or 8, their subharmonics with amplitudes differing from the amplitudes of the main oscillations by no more than 10 times are simultaneously generated. Elements 2, 4, .5, 6 form the first dynamic system (the first of the coupled oscillators) that evolves on a simple attractor and generates regular two periodic oscillations, and elements 7-10 form the second dynamic system (the second of the coupled oscillators ), which also evolves on a simple but different from the first attractor, and generates regular double-periodic oscillations, the frequencies of the components of which (the fundamental frequency and its subharmonic) are in non-multiple ratios with the frequencies of the fundamental Fucking and its sub-harmonics of the first dynamical system. Oscillations of each dynamic system go to load 1. With a strong (exceeding critical value) coupling of these two dynamic systems via communication element 3, a qualitative change in the nature of the oscillations occurs: due to the effect of spontaneous capture of one oscillator by another, stochastization of the oscillations and the ensemble are observed from coupled oscillators it turns into a noise generator, which is a dynamic system evolving on a strange attractor, Co. The swans entering load 1 become chaotic. The presence of subharmonics formers in the circuit of coupled oscillators leads to the expansion of the spectrum of chaotic oscillations of the noise generator to values exceeding an octave and to the increase in the uniformity of their spectral characteristics. When constructing a generator of noise oscillations on solid-state active multipoles, it is advisable to use a structural element of the most active multipoles, which are a layer of spatial charge (called

also depleted region) and which is a nonlinear capacitor. In particular, when constructing noise generators on bipolar transistors (active four poles) by sub-shapers

harmonics are their p - n junctions. In the region of ultrahigh frequencies of generated oscillations, the use of distributed oscillatory systems that can be designed as a single unit is effective as an oscillatory circuit

feedback loop element.

The invention is illustrated by an example of a specific embodiment of a microwave noise generator in a microstrip (MP) hybrid 5 integrated design: a ring-shaped asymmetric MP line with an MP jumper and an MP output is applied to a multicore plate soldered to a metal heat sink. Transistors are inserted into the gaps 0 of the ring-shaped MP line, transistors are inserted into the gap, the capacitive coupling capacitor is connected to the MP jumper, and the isolation capacitor is connected to the output MP line break. Features of the topology of the MP-5 lines and the relative positions of the functional elements of the experimental layout are illustrated in FIG. 2, on which the following designations are introduced: 11 and 12 are bipolar transistors, respectively, 0 of the first and second coupled oscillators; 13 - capacitor coupling capacitor; 14, 16, 17, 19 — segments of an annular asymmetric MP line; 15, 18 - segments of the MP line of the jumper; 20 - MP line output 5 and generator of chaotic oscillations; 21 - output isolation capacitor. The jumper (segments 15, 18) divides the annular MP line into two unequal (for the purpose of frequency detuning) half rings that form (together with the reactive elements and resistors of the transistors) oscillatory systems and feedback circuits of coupled oscillators. Bipolar transistors act as active multipole generators of self-oscillators, and their p - n-junctions - functions of the subharmonic generators.

The spectral characteristics of the output oscillations of the first and second autonomous oscillators and ensembles of coupled oscillators (noise generator) are shown in FIG. Over, b, c, respectively.

In Figs. 3a, 3b, c, Ap is the amplitude of the nth frequency component of the regular oscillation, f is the oscillation frequency, f0 is the normalization frequency, and S is the spectral density of the generated chaotic signal. The difference in the amplitudes of the main and subharmonic components of the regular oscillations of each of the autonomous oscillators is small and the spectrum of chaotic oscillations is uniform in a wide frequency range.

The operability of the proposed device was demonstrated using the shapers of the second subharmonics, but shapers of other subharmonics or several subharmonics can be used in it.

Claims (1)

SUMMARY OF THE INVENTION A noise generator comprising a first active multipole, a second active multipole, a first oscillatory circuit and a first feedback circuit connected in series, a second oscillatory circuit and a second feedback circuit connected in series, a communication element, one terminal of which is connected to other terminals the first and second feedback circuits, and the other terminal of the communication element is connected to the outputs of the first and second active multipoles and is the output of a noise signal generator, characterized in that, in order to increase the uniformity of the power spectral density and expand the spectrum of noise signals, a first subharmonic driver is inserted between the input of the first active multipole and the other output of the first oscillating circuit, and a second subharmonic driver is introduced between the input of the second active multipole and the other output of the second oscillating circuit . FIG 2 h, P 6.0 8.0 and 10.0 12.0 U Ј