SU1363428A1 - Noise signal generator - Google Patents

Abstract

The invention relates to radio engineering and communication and provides for an increase in the stability of the power spectral density of noise signals. The noise signal generator contains noise sources for diodes 1.2, differential amplifier 3, capacitor 4, comparator 5, D-flip-flop 6, clock pulse generator 7, controllable 1G key 8, low-pass filter 9, integrating amplifier 10, voltage divider 11. The noise voltages of noise sources on diodes 1.2 are folded anti-phase on differential amplifier 3. Capacitor 4 eliminates the zero drift of the generated noise signal. D-flip-flop 6 generates a random sequence of pulses (SPI). Controlled key 8 produces an amplitude stabilization of the SPI. A low-pass filter converts the IPN to a noise signal and normalizes the law of the distribution of noise signals in a given passband. For automatic compensation, destabilized is blue, and their factors are the voltage source 12, voltage divider 11, and integrated amplifier 10, which form the bias signal for comparator 5. As a result, SPI symmetry is restored. 1 il. SL yytod

Description

one

The invention relates to radio engineering and communications, measurement technology, and can be used in experimental studies of devices and systems by statistical test methods.

The purpose of the invention is to increase the stability of the power spectral density of noise signals.

The drawing shows a structural electrical circuit of a noise signal generator.

The noise signal generator contains the first noise source on diode 1, the second noise source on diode 2, differential amplifier 3, capacitor 4, comparator 5, D-flip-flop 6, clock generator 7, control key 8, low-pass filter 9, integrating amplifier 10, voltage divider 11, reference voltage source 12.

The noise signal generator works as follows.

The sources of noise signals are the first source of noise on diode 1 and the second source of noise on diode 2, whose noise voltages are anti-phase on the differential amplifier 3, which is. allows to obtain a symmetrical noise signal with a normal distribution law and significantly weakens the coalescence of common-mode components of interference and interference. The output of the differential amplifier is connected (divided13

telnyh) capacitor 4, eliminating drift zero.

Next, the noise signal arrives at the comparator 5, which performs discretization by the level, in this case zero, while maintaining the symmetry condition when the duration of the pulses and the intervals between them at the comparator output are the same. From the output of comparator 5, a random sequence of pulses arrives at the information input of the P-trigger 6, the C-input of which receives clock pulses from the output of the clock pulse generator 7, as a result of which a random sequence of pulses with equal probability is generated at the output of D-trigger 6 the appearance and absence of pulses at times that are multiples of the duration of clock intervals.

Claims (1)

Invention Formula The noise signal generator containing the first source of schum on the diode The mean values of the second diode noise source, whose outputs are connected respectively to the inverting and non-inverting inputs of the differential amplifier, as well as a low-pass filter, are mostly based on the fact that, in order to increase the stability of the spectral power density of the noise signals, a series-connected capacitor is inserted, comparator 55 D-trigger and controlled key, series-connected reference voltage source, voltage divider and integrating amplifier, clock generator, the output of which . sixteen 634282 The control key 8 produces an amplitude stabilization of a random sequence of pulses by means of (- a control signal from the output of the reference voltage source 12, and a low-pass filter 9, which is the output of the noise signal generator, converts the random sequence of pulses into a noise signal and normalizes the distribution of noise signals in a given bandwidth. During the operation of the noise signal generator, there are destabilizing factors, and 1 asymmetry of noise signals on the first and second noise diodes, as well as differences in the levels of the spectral power density and their change over time, which leads to a violation of the symmetry of a random sequence of pulses at the output of the comparator 5. For automatic compensation of the specified des GZ 25 biasing factors, voltage divider 11 and integrating amplifier 10 are applied, the output of which produces an offset signal proportional to the asymmetry value of the case of a 30 pulse sequence at the output of the control key 8. At the same time, the offset signal arrives at the inverting input of the comparator 5, resulting in a symmetry random The 35 pulse train is restored, which makes it possible to increase the stability of the spectral density of the power of the generated noise signals. 20 Invention Formula 3 13634284 connected to the C-input of the D-flip-flop, an amplifier, the output of which connects the second capacitor lead of the connectors to the second input of the comparator, and with the output of the differential usi-reference voltage source The output of the control key is also connected to the control key. It is united with the input of the low-pass filter of the input of the controlled key and the inverting input of the integrating chip.