RU54277U1 - NOISE GENERATOR WITH REDUCTION OF SPECTRA PARAMETERS - Google Patents

Abstract

The utility model relates to the field of radio engineering and can be used in measurement technology, medicine and radio suppression means. To do this, in a noise generator containing a relaxation oscillator 2 and oscillator 1 connected in series, as well as a load, according to a utility model, the oscillator 1 is made in the form of a voltage controlled oscillator (VCO) 1.1, the input of which is connected to the output of a tunable constant voltage driver 1.2, and the shaper of the relaxation oscillation 2, consists of a series-connected shaper of normalized noise 2.1, the shaper of the sawtooth pulse sequence 2.2 and the adder 2.3, the output of which is the output of the former of the relaxation oscillation 2, the second output of the normalized noise former 2.1 is connected to the second input of the adder 2.3, the output of the oscillator is connected to the load.

Description

The utility model relates to the field of radio engineering and can be used in measurement technology, medicine and radio suppression means.

The main development trend of modern noise generators (GSH) used, in particular, in radio suppression means is the expansion of their functionality, while increasing the reliability of their work. One of the main requirements for GS is the provision of operational tuning of the spectrum parameters of the generated noise signals in the operating frequency band.

Known noise generators for AS 1817634, H 03 B 5/12, US Pat. RF 2042260, H 03 V 5/12. Their disadvantage is the narrow frequency band of the emitted signal.

Closest to the technical nature of the proposed is a generator of chaotic oscillations according to US Pat. RF 2058660 H 03 B 29/00, published 04/20/96 Bull. No. 11, adopted as a prototype.

Figure 1 presents the functional diagram of the prototype generator, where indicated:

1, 1 '- associated oscillators;

2, 2 '- formers of relaxation oscillations;

3 - load;

4 - communication device.

The prototype generator contains coupled oscillators 1 and 1 ', in the power supply circuit of which are included the corresponding formers of relaxation oscillations 2 and 2', performing amplitude modulation of oscillators 1 and 1 '. The communication of the oscillators is carried out by the communication device 4, and the output noise signal enters the load 3.

The prototype generator operates as follows. When the supply voltage is turned on, formers 2 and 2 'form relaxation oscillations that modulate the amplitude of the operating frequencies of the oscillators 1 and 1'. The connection of the oscillators through the device 4, leads to stochastic oscillation of the ensemble of oscillators as a single dynamic system. The chaotic oscillations of the coupled oscillator system entering the load 3 are a noise signal with tunable parameters. The average frequency of the spectrum is tuned to the high-frequency region in the band of about 40%, the band of generated noise is regulated within 60%, with a squareness factor of ~ 0.8.

The disadvantage of the prototype generator is not a large enough range of tuning parameters of the noise signal.

To eliminate this drawback in a noise generator containing a relaxation oscillator and a oscillator connected in series, as well as a load, according to a utility model, the oscillator is made in the form of a voltage-controlled oscillator (VCO), the input of which is connected to the output of a tunable constant-voltage driver, and the relaxation driver oscillations, consists of a series-connected shaper of normalized noise, a shaper of a sawtooth pulse sequence and an adder whose output is an output of the relaxation oscillation, the second normalized output noise shaper connected to the second input of the adder, the oscillator output is connected to a load.

Figure 2 presents the functional diagram of the proposed noise generator, where indicated:

1 - a generator based on a voltage controlled oscillator (VCO);

1.1 - voltage-controlled generator (VCO);

1.2 - tunable DC voltage driver;

2 - shaper relaxation oscillations,

2.1 - shaper normalized noise;

2.2 - shaper sawtooth pulses;

2.3 - adder;

3 - load.

The proposed noise generator contains a serially connected shaper of modulating relaxation oscillation 2, a self-oscillator based on the VCO 1 and load 3. Moreover, the shaper of modulating relaxation oscillation 2 consists of serially connected shaper of normalized noise 2.1, a shaper of sawtooth pulses 2.2 and adder 2.3, the output of which is the output shaper modulating relaxation oscillation 2. In addition, the second output of the shaper normalized noise 2.1 s connected to the second input of the adder 2.3. The oscillator 1 consists of a series-connected tunable dc driver 1.2 and VCO 1.1. The output of the VCO 1.1 is the output of the oscillator 1.

The noise generator operates as follows. When the supply voltage is turned on, a constant voltage is generated in block 1.2 and a modulating relaxation oscillation in block 2, which are fed to the VCO 1.1 input. The amplitude of the constant voltage sets the frequency of harmonic oscillations ω ₀ VCO 1.1, which is the average frequency of the spectrum of the noise signal. The amplitude of the DC voltage can be changed under the influence of U _UPR supplied to the input of block 1.2. The operating frequency band of the noise generator is determined by the amplitude of the modulating relaxation oscillation. A modulating relaxation oscillation is generated at the output of adder 2.3 and is an additive mixture of normalized noise and a sequence of sawtooth pulses modulated by the same noise. The pulses in the sequence differ in duration, and

it means that according to the steepness of the “saws” and “normalize” the relaxation oscillation at the entrance to the VCO 1.1. The average duration of the sawtooth pulses is chosen such that, at certain ratios with the reaction time of the VCO 1.1 on the disturbing effect, the spectrum of noise oscillations expands. Under the influence of variable amplitudes of constant voltage and relaxation oscillations in the load 3, a noise signal is formed with the given parameters.

Tests of the prototype of the inventive noise generator showed high performance over a wide temperature range, the tuning time of the noise signal parameters (medium frequency, operating frequency band, amplitude) was about 50 μs, the average frequency of the spectrum and the band of generated noise were tuned within two octaves with a squareness factor ~ 0.9.

Claims (1)

A noise generator comprising a relaxation oscillator and a self-oscillator connected in series, as well as a load, characterized in that the generator is a voltage-controlled oscillator (VCO), the input of which is connected to the output of a tunable constant-voltage driver, and the relaxation oscillator consists of a series connected by a normalized noise shaper, a sawtooth pulse shaper, and an adder whose output is an output relaxation oscillation generator, wherein the second output normalized noise shaper connected to the second input of the adder, the oscillator output is connected to a load.