SU1215160A1 - Periodic oscillator - Google Patents

Abstract

The invention can be used in devices for synchronous detection of amplitude modulated signals with carrier suppression for the simultaneous generation of synchronous signals of sinusoidal and rectangular shapes. Nonlinear distortion is reduced with a sinusoidal waveform and the stability of the rectangular wave ratio increases. The device contains two integrating amplifiers (ICs) I and 2, an operational amplifier ILI 3, a zero-level comparator, PSNU 4, an inverting amplifier 5, and four scaling resistors 6-9. Each of the PSIs 1.2 shifts the phase by 90 ° C. and provides suppression of extreme frequencies, so that quadrature harmonic oscillations with a low level of nonlinear distortion are formed at their outputs. Independence of duty ratio on the value of put, and negative. signal levels of a rectangular shape at the output of inverting amplifier 5 lead to greater stability of the porosity of rectangular oscillations, since The constant component of the signal at the input of the NUC 4 is automatically maintained at a zero level by the PS 2, which forms a constant component at the inverting input of the shelter 3, compensating the constant component of the rectangular signal at the output of the inverting amplifier 5. 1 Il. W ate od

Description

one

The invention relates to radio engineering and can be used in devices for synchronous detection of signals of amplitude modulation with carrier suppression for simultaneous generation of synchronous signals of sinusoidal and rectangular shapes.

The purpose of the invention is to reduce nonlinear distortion in the case of a sinusoidal waveform and increase the stability of the duty cycle of square wave.

The drawing shows a structural electrical circuit of a generator of periodic oscillations.

The generator of periodic oscillations contains the first and second integrating amplifiers 1 and 2, the operational amplifier 3, the comparator

Level 4, inverting amplifier) 5, first, second, third and fourth scaling resistors 6-9.

The generator of periodic oscillations works as follows.

The first and second integrating amplifiers 1 and 2, the operational amplifier 3 and the third and fourth scaling resistors 8 and 9 form a universal link of the second order, which serves as a filtering circuit of high quality. The first scaling resistor 6 disrupts the phase balance in the oscillating circuit. Connecting a circuit of a zero-level comparator 4, inverting amplifier 5, second and first scaling resistors 7 and 6 creates an unexpected effect: at the same time the phase balance and amplitude balance required for self-excitation are maintained. At the same time, the generator of periodic oscillations simultaneously has the properties of an auto-generator and a highly selective filter. The zero-level comparator 4 converts the input sinusoidal signal into a square-shaped square wave, which is further inverted by an inverting amplifier.

5dl phase balance adjustment. The rectangular voltage across the second scaling resistor 7 is introduced into the selective oscillator system, which selects

151602

 the first harmonic oscillates and effectively suppresses higher harmonics. Each of the integrating amplifiers 1 and 2 shifts the phase by

90 ° and provides suppression of multiple frequencies; therefore, quadrature harmonic oscillations with a low level of non-linear distortion are formed at their outputs. Independent of the ratio of the duty cycle

positive and negative levels of a square-shaped signal at the output of inverting amplifier 5 leads to an increase in stability

15 duty cycle of rectangular oscillations. This is due to the fact that in this periodic oscillation generator the constant component of the signal at the input of the comparator 4 of the zero level 20 n is automatically maintained at the zero level with the help of the second integrating amplifier 2, which forms on the inverting input of the operational amplifier 3

25, the constant component compensating the constant component of the signal of the inverter amplifier 5. The constant component of the signal at the input of the zero comparator 4 is almost zero and does not depend on the instability of the supply voltages and resistors.

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Claims (1)

Invention Formula The generator of periodic oscillations, contents sequentially connected first integrating an amplifier, first and second scaling resistors, a zero-level comparator connected in series and an inverting amplifier, as well as sequentially connected third and fourth scaling resistors, characterized in that, in order to reduce nonlinear distortions in the case of sinusoidal oscillation and increase the stability of the rectangular oscillation porosity, a second integrating amplifier and an operational amplifier, the non-inverting input of which is connected to the connection point of the first and second scaling resistors, inverting input - to the point of connection of the third and fourth 3 1215160 go scaling resistors, ai to the input of the second integrating the output is connected to the input of the first integrator amplifier, the output of which is connected to the amplifier and to the other is passed to another output of the third mass fourth resistive stacking resistor, and the output torus, and the output of the first integra-5 inverting amplifier is connected A power amplifier is also connected to another terminal of the second scale input of the zero level resistor comparator.