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Semiconductor generators of stochastic signals (noise generators) are designed to produce broadband noise signals. These devices can be used to address such problems as noise signal transmission through diverse media, to study the extraction of deterministic signals against the background of stochastic signals, to examine the dynamic chaos in electronic devices and other similar applications.
With that purpose in mind, a number of devices have been developed for operation in the range from 1.5 to 10.5 GHz. Those proprietary devices are produced in two options. The first one is designed to operate both as part of various equipment and autonomously.
1. Generators operable as part of other equipment
External view of these generators is shown in Fig. 1 (a,b)
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| Fig. 1(a). External view of this generator from the side of output connector with supplied cables and screws. | ||
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| Fig. 1 (b). External view of this generator from the side of power supply connector. |
The performances of our proprietary 3.4÷8.9 GHz generators are presented in Table 1.
Table 1. Performances of stochastic generators
| Generator type | Performance | Value |
| Noise generator 3.4...3.9 GHz | Frequency range, MHz | 3450-3750 |
| Power output, mW | 950 | |
| Power non-homogeneity over frequency range, dB | Less than 7 dB | |
| Power output adjustment range, dB | More than 34 dB | |
| Feed circuit consumption current, positive 1.5 V, A | 1.02 | |
| Feed circuit consumption current, negative 12 V, A | 0.018 | |
| Consumption current over control circuit by attenuator, A | 0.037 | |
| Noise generator, 3.8...4.4 GHz | Frequency range, MHz | 3900-4300 |
| Power output, mW | 890 | |
| Power non-homogeneity over frequency range, dB | Less than 8 dB | |
| Power output adjustment range, dB | More than 32 dB | |
| Feed circuit consumption current, positive 1.5 V, A | 1.04 | |
| Feed circuit consumption current, negative 12 V, A | 0.02 | |
| Consumption current over control circuit by attenuator, A | 0.037 | |
| Noise generator, 4.9...5.5 GHz | Frequency range, MHz | 5000-5400 |
| Power output, mW | 950 | |
| Power non-homogeneity over frequency range, dB | Less than 8 dB | |
| Power output adjustment range, dB | More than 32 dB | |
| Feed circuit consumption current, positive 1.5 V, A | 1.07 | |
| Feed circuit consumption current, negative 12 V, A | 0.02 | |
| Consumption current over control circuit by attenuator, A | 0.037 | |
| Noise generator, 8.1...8.9 GHz | Frequency range, MHz | 8200-8800 |
| Power output, mW | 930 | |
| Power non-homogeneity over frequency range, dB | Less than 10 dB | |
| Power output adjustment range, dB | More than 33 dB | |
| Feed circuit consumption current, positive 1.5 V, A | 1.06 | |
| Feed circuit consumption current, negative 12 V, A | 0.022 | |
| Consumption current over control circuit by attenuator, A | 0.035 |
| Maximum size for all generator types would be: | 235x120x60 mm |
| Maximum weight would be: | not heavier than 2 kg |
2. Generators for autonomous operation
The autonomous pulsed generators of stochastic signals are available in their ten options covering the range from 1 to 10 GHz. The generators are manufactured according to the print technology on a plate made of a foil-clad high-frequency dielectric material. A photographic image of one of the generator types is given in Fig. 2.
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| Fig. 2 General view of pulsed generator of stochastic signals designed to operate in the frequency range 3÷3.9 GHz. |
Main operation characteristics of the proprietary sensors are as follows:
| Nominal pulsed power generation | - Not more than 15 mW |
| Nominal pulse width | - 10 to 15 microseconds |
| Nominal pulse train frequency | - 25...80 kHz |
| Total sensor operation time | - Not less than 2 hours |
| Nominal medium frequency value: Type 1 Type 2 Type 3 Type 4 Type 5 Type 6 Type 7 Type 8 Type 9 Type 10 |
- (1.45±0.45) GHz - (2.45±0.45) GHz - (3.45±0.45) GHz - (4.45±0.45) GHz - (5.45±0.45) GHz - (6.45±0.45) GHz - (7.45±0.45) GHz - (8.45±0.45) GHz - (9.45±0.45) GHz - (10.45±0.45) GHz; |
| The half-power bandwidth of power generation would be: | - not less than 150 MHz |
| The power supply voltage would be: | - 3 V |
Note.The nominal values of the above characteristics are guaranteed if the power supply voltage is not less than 3.2 V (the voltage should be measured prior to connecting the component to the sensor).
The sizes of the generators are determinable by their operating frequency range.
In order to use the proprietary autonomous small-size pulsed generators, such scattering systems are employed that allow to form generator arrays from generators of different sizes, that is to say with variable operating frequency ranges.