SU741413A1 - Voltage shaper - Google Patents

Description

(54) VOLTAGE FORMER

one

The invention relates to radio engineering.

A digital current generator is known, comprising a voltage generator of a predetermined shape, a voltage code converter, and digital storage elements. code converter, eg l.

The drawback of the device is the low accuracy of reproduction of a given signal spectrum.

The closest to the invention to the technical essence is a voltage driver containing a control unit, a comparison element, an input connected to the output of a sawtooth generator, its input combined with the input of a voltage generator of a given shape, low pass filter, first single-shot.

The disadvantage of this device is not high enough reproduction accuracy of a given waveform.

The purpose of the invention is to eliminate this drawback.

The goal is achieved by the fact that a well-known voltage driver containing a control unit, an Element of Comparison, is connected to the output of a saw-tooth generator, whose input is combined with the input of a voltage generator of a given shape, low-pass filter, first one-shot, pulse counter , code-voltage converter, first, second memory elements, second, third, fourth one-oscillators, with the inputs of the first and second audio circuits being combined and connected to the output of the control unit, and pulse counter to the converter input is a code-voltage converter whose output is connected to the input of the comparison element, whose output is connected by the input of the third one-oscillator, the inhibiting input of which is connected to the output of the first one-oscillator, and the output of the first memory element is connected to the input of the second one-oscillator the fourth switch, the output of which is connected to the control input of the second memory element, the output of which is connected to the input of the low-pass filter, and the input through the first memory element to the output the generator voltage of a given form. The drawing shows a diagram of the device. The device contains a unit 1, a unit 2 of comparison, a generator 3 sawtooth voltage, a generator 4 voltage of a given form, a low-pass filter 5, the first, second, third, fourth one-shot 6-9 pulse counter 10, the converter 11 code voltage, the first, second elements 12 and; 13 memories. The device works as follows. The generator 3 accumulates a periodic saw-tooth voltage with a fixed repetition period. The control unit 1 generates a sequence of pulses with a repetition period ra slowly changing according to a given law. Counter 10 counts these pulses, periodically full. The code of the number of the next pulse generated by the counter 10 is converted by the converter 11 to the corresponding level of analog voltage. As a result, a step voltage is formed at the output of the converter 11 with a constant 1 steps and a slowly varying repetition period. At the moments of intersection of the sloping part of the sawtooth and step voltages, the output of the comparison element 2 produces positive voltage fluctuations that trigger the single-oscillator 8, and it produces short writing voltage pulses that switch memory element 12 during its operation. from voltage storage mode to voltage recording mode. During recording, element 12 memorizes and then stores, up to the next recording pulse, instantaneous values of voltage on generator 4. Generator 4 generates a periodic voltage having a predetermined shape exactly equal to the period of repetition of a sawtooth voltage. Since the recording pulses are uniformly shifted over time with respect to the sawtooth voltage, element 12 stores with a series of instantaneous values 134 of the output voltage of generator 4, read through the first period of its period in equal parts. But the elemental voltage of the element 12 is unsuitable for forming the output voltage of the device, since the duration of its steps, due to the asynchronism of the generator of the control unit 1 and the generator 3, is not equal to the pulse repetition period of the control unit 1. To equalize them, the voltage from the output of the memory element 12 is rewritten into the memory element 13 by means of short voltage rewriting pulses produced by single-oscillator 9 at the frequency of the gene. Ratio of control unit 1. The single-vibration 9 is triggered by the falling edge of the output pulse of the voltage of the single-vibration 7. Thus, a small delay of rewriting pulses against the pulses of the generator of the control unit 2 is provided. Thus, in memory element 13 successively one after another, for time intervals between pulses of control unit 1, a series of instantaneous values of the output voltage of a predetermined form of generator 4 is stored. Frequency filter 5 passes to the output of the device frequency below the pulse frequency of the generator 2 device control. The output of the device is a voltage, the repetition period of which is equal to the repetition period of the step voltage at the output of the converter 11, and the form, when fulfilling the conditions specified below, corresponds exactly to the voltage form of the specified form on the generator 4, but reversed in time. Reversing a periodic signal over time does not change its spectrum. The repetition period of the step voltage at the output of the converter 11 is determined by the repetition rate of gene pulses. Ratio of the control unit 2 and the capacity of the counter 10. The single-oscillators b and 7 exclude the possibility of significant, distorted 1-th output voltage of the device, due to the non-synchronism of the generators of the block 2 and the generator 3. In the absence of one-vibrator 6 and 7, some recording pulses of the single-oscillator 8 may partially coincide in time with the rewriting pulses of the one-shot 9, which leads to a distortion of the signals rewritten into element 13,

Claims (1)

SUMMARY OF THE INVENTION A voltage generator comprising a control unit for comparing an input connected to the output of a sawtooth generator, the input of which is combined with the input of a voltage generator of a given shape, a low-pass filter, a first one-shot, characterized in that, in order to increase the accuracy of reproduction of a given shape signal, a pulse counter, a code-voltage converter, the first, second memory elements, the second, third, fourth one-vibrators are introduced into it, and the inputs of the first and second are one the vibrators are combined and connected to the output of the control unit, and through the pulse counter to the input of the converter is a code-voltage, the output of which is connected to the input of the comparison element, the output of which is connected to the input of the third one-shot, the inhibiting input of which is connected to the output of the first one-shot, and the output to the control the input of the first memory element, the output of the second one-shot is connected to the input of the fourth one-shot, the output of which * is connected to the control input of the second memory element, the output of which is connected to an ode to a low-pass filter, and the input through the first memory element to the output of a voltage generator of a given shape.