Method of generating oscillations

 

(57) Abstract:

The invention relates to electrical engineering and can be used to generate oscillations of a special form. Achievable technical result is the generation of undamped harmonic oscillations with strictly regulated procedures of change of the instantaneous phase, or only with the growing nature of the phase change, or only with decreasing and simplifying the set of operations for pairing fluctuations at the output of the instantaneous phase for the limit key values. This technical result is achieved due to the fact that in the method of generating oscillations, including trigonometric transformation range of input voltages output voltages simulating one period of the harmonic dependence, as the input voltage range select falling sawtooth wave with a sharp spike during the reverse movement, and management of the mark phase oscillation is performed by inverting it. 3 Il.

The present invention relates to electronics and, in particular, to techniques for generating oscillations of a special form and can form the basis of a new branch of radio engineering with new cosmogenic fluctuations or given the growing phase, or given the waning phase.

In computer modeling has found application operation trigonometric functional transformation of the input voltage range, simulating the main value of the argument, in other modeling one period of the harmonic dependence [1]. In particular, these techniques are used for modeling the periodic characteristics of the phase detectors [2].

The essence of this method is the following.

1. Choose the range of input voltages simulating the abscissa trigonometric dependence, for example, cosinusoid, within the main values.

2. For the selected range of input voltages produce a piecewise linear approximation of y one period of the simulated dependence.

3. Put trigonometric transform voltage from the selected range.

4. Use the trigonometric conversion of these voltages as simulated periodic dependence.

Note the following advantages of this method. 1) One and the same set of operations can be used to simulate different dependencies (cosine, sine, arcsine). 2) the Procedure of dipsw mates simulated dependencies when the abscissa is outside the main values, and therefore the user analog machines must in each case to develop their techniques mates.

Closest to the proposed invention to the technical essence and the achieved technical effect is a method of modeling non-linear characteristics of the phase detectors [2], where such techniques mates are applied. The method is as follows.

1. Choose the range of input voltages Un< U < Utosimulating the phase shift detected fluctuations within the main values.

2. For the selected range of input voltages produce a piecewise linear approximation of y one period of the simulated characteristics of the phase detector, for example, cosinusoid.

3. Put trigonometric transform an arbitrary voltage U of the selected range.

4. Use the trigonometric transformation U as simulated periodic dependence, for example, F(U) = V0cosU.

5. Input voltage pre-integrate.

6. Continuously compare the result of integration with U /SUB> for time t << T - time-passing the entire interval from Unto Utointerrupt integrating impose the initial condition Uabout= Un.

8. If U < Unat time t interrupt the operation of integration, impose the initial condition Uabout= Uto.

9. After a time t continue the operation of integration.

The advantage of this method is that the pairing is based at infinite movement of the simulated phase difference in the direction of its increase or the decrease occurs automatically.

The downside of it is the complexity of the group operations (5 to 9), providing a pair of periods simulated dependence. In addition to the operation of integration requires 2 comparisons and 4 of the switch.

The first technical problem to be solved by the invention is the generation of undamped harmonic oscillations with strictly regulated procedures of change of the instantaneous phase, or only with the growing nature of the phase change, or only with dwindling.

The second technical problem to be solved by the invention is the simplification of the set of operations for pairing fluctuations at the exit is on the known method of modeling periodic dependencies with the selection of the range of the converted voltage and a piecewise linear approximation of one period of the simulated harmonic dependence, the range of the converted voltage is formed by generating a descending sawtooth oscillations with spike during the reverse movement, and management of the mark phase oscillation is performed by inverting this sawtooth oscillations.

Comparative analysis of the claimed invention with the prototype shows that the method differs from the one known for the following attributes.

1. As the input voltage range select falling sawtooth oscillation.

2. Control the sign of the increment of the phase is performed by inverting the sawtooth diminishing oscillations.

Thus, the proposed method meets the criteria of the invention of "novelty."

The claimed method of generating oscillations has a much broader scope than the prototype. The prototype is applicable only in the narrow terms of the analog-to-digital and analogue machines, providing a computer simulation of the periodic characteristics of the phase detectors. The proposed method is applicable in all engineering because it opens n

Will hold now the analysis of inventive step of the proposed method of generating fluctuations.

Distinctive techniques of the proposed method separately in modern measuring and computing machinery industries are well-known and widespread. Thus, the generation of a periodic sawtooth decreasing oscillations, the operation of inverting each individually are not new and is widely used in radio and computer engineering. However, in combination with taking trigonometric conversion range of input voltages output voltages simulating one period of the harmonic dependence, these techniques provide the generation of a harmonic oscillation with a given order of the phase change.

The analysis of many technical solutions to identify them similar properties have not revealed such decisions.

The above analysis leads to the conclusion about conformity of the proposed method the criterion of "inventive step".

In Fig. 1 shows a piecewise linear approximation of one period of the trigonometric functions (cosinusoidal). In Fig. 2 shows waveforms of the operations of the method of Fig. 3 shows an example of t which is typical techniques of analog computing machinery (see [1] p. 95). The range of input voltages U Unto Utocorrespond to the values of the ordinates of cosinusoid V within the main values of KFP up +KfP, where Kf- scale factor in In/deg, N = 180 deg.

The dynamics of the process of generating a harmonic oscillation with a given character of the phase change is illustrated by the waveforms of Fig. 2, first by increasing the phase shift f, and then when descending (Fig. 2B). The sawtooth voltage U (Fig. 2B) with a drop from Unto Utoadequately simulates the above phase change F. When the voltage U values Utothere is a jump to the value Unand increasing the phase change f corresponds to a positive increment of voltage U. When changing nature of the phase change (Fig. 2A is shown with a bold line) the slope of the saw becomes negative (see Fig. 2B also bold line). Sinusoidal voltage U (Fig. 2B) has the following feature: in the first part of the waveform (line lean) phase increases, the second part (line in bold) phase decreases.

The full list of operations of the proposed method is as follows.

1. Perform trigonometric transformation on the ptx2">

2. Choose quality range of input voltages falling sawtooth voltage spike during the return stroke.

3. Control the sign of the phase of the generated oscillations by inverting sawtooth diminishing oscillations.

The claimed method of generating oscillations may be implemented by a generator block diagram is shown in Fig. 3. The oscillator with the specified character changes phase consists of a series of sawtooth generator decreasing oscillations 1, inverter 2, the first input of the switch 3 at two positions and trigonometric unit 4. A second input switch connected to the output of the generator 1. In unit 4 the selected range of input voltages from - 9V to +9V (Un= -9V, Uto= +9V) to simulate the phase of the cosine in the range from-P to +P (operation 1 of the proposed method). For the selected range of input voltages on the elements of the unit 4 is produced by a set of piecewise linear curve (see Fig. 1) approximating cosinusoid within the main values (operation 1 of the proposed method, in common with the prototype). The generator 1 to its output voltage completely covers a selected range of input voltages block 4 oglasnik values, abrupt jumps in the return stroke corresponds to the pairing of one period with another in the hollows of cosinusoid (Fig. 2B marked with *).

The sawtooth generator decreasing oscillations can be selected as standard (see page 215 in [3]), the inverter can be implemented at the operational amplifier, for example, UT-403, UT-412, and others [3] , the trigonometric unit can be applied from AVM, for example, EMU (mermaid) (see [1], page 159).

List of used sources

1. Shor, I. J., Levin, M., user's manual analog and analog-to-digital computing systems/Ed. by I. M. of Wittenberge. Chisinau: Stinica, 1986, S. 95, 159.

2. Prokofiev E. C. Research systems-locked loop analog computing machines, PhD thesis, 1973, S. 51.

3. Analog and digital integrated circuits/edited by S. C. Jakubowski. - 2nd ed., Rev. - M.: Radio and communication, 1984, S. 215.

4. Andronov A. A., Vitt, A. A., Khaikin, S. E., oscillation Theory /Ed. by N. A. Zheleznova, M.: Fizmatgiz, 1959, page 49.

Method of generating oscillations, including trigonometric transformation range of input voltages output voltages simulating one period of the harmonic shabanie with the spike during the reverse movement, and management of the mark phase oscillation is performed by inverting it.

 

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3 dwg, 4 tbl

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