SU1102025A1 - Device for forming sawtooth voltage with s-correction - Google Patents

Abstract

DEVICE FOR FORMING sawtooth C 5 -Correction comprising E1lntterny repeater, the first and second sawtooth generators, each of which consists, for example, from a key input of which is connected to an input device, output - a connecting point connected in series and a capacitor element tokostabiliziruyuschego , characterized in that, in order to increase the accuracy of the S correction of the saw-tooth voltage during operation of the device from variable frequency control pulses, the following are introduced into it The first constant level shift unit, rectifier, second constant level shift unit, the output of the current stabilizing element of the first sawtooth generator is connected to the input of the first constant level shift unit, the output of the emitter follower is connected to the control input of the current stabilizing element of the second generator S sawtooth voltage, and the input (L C with the output of the second unit of the shift of a constant level.

Description

The invention relates to a pulse technique and can be used, for example, as a sweep generator for oscillograph tubes.

A sawtooth voltage driver comprising a first sawtooth voltage generator consisting of a key, the input of which is connected to the device input, is output by a common connection point of series-connected current stabilizing element and capacitor G1.

The disadvantage of this device is the high error of formation

S - sawtooth correction.

The closest in technical essence to the invention is a sawtooth voltage forwarder, with a 5 correction, containing an emitter follower, the first and second sawtooth voltage generators, each of which consists, for example, of a key, the input of which is connected to the input of the device, the output is with a common connection point connected in series. current stabilizing element and capacitor C2.

The disadvantage of the device is the impossibility of ensuring high accuracy of the S correction of the saw-tooth voltage when the device is operating from variable frequency control pulses.

The purpose of the invention is to improve the accuracy of 5-correction of the sawtooth voltage when the device operates from variable frequency control pulses ..

The goal is achieved by the fact that in a device for forming a sawtooth voltage with a 5-correction, containing an emitter follower, the first and second sawtooth voltage generators, each of which consists, for example, of a key, the input of which is connected to the input of the device, output -c common point of connection of series-connected current-stabilizing element and capacitor, serially connected first constant-level shift unit, rectifier, second constant-level shift unit, with the output The stabilizing element of the first saw-voltage generator is connected to the input of the first constant level shift unit, the regulated output of the emitter follower is connected to the control input of the current-stabilizing element of the second sawtooth generator, and its input is connected to the output of the second constant-level shift unit.

The drawing shows a structural electrical circuit of the device.

The device contains an emitter follower 1, the first and second generators 2 and 3 of the sawtooth voltage, each of which consists, for example, of a key 4, the input of which is connected to the input of the device, the output - with a common point. The connection of series-connected current stabilizing element 5 and a capacitor 6 , the first constant-level shift unit 7 connected in series, the rectifier 8, the second constant-level shift unit 9, the output of the current-stabilizing cascade of the element of the first sawtooth voltage generator is connected to Odom first block shift constant level, regulated output emitter follower connected to the control input of the second element tokostabiliziruyuschego sawtooth generator, and its input connected to the output of the second block shift constant level.

The device works as follows. -,

The input signal is fed to the inputs of the keys 4, which charge the capacitors b to the value E. At the end of the input pulse, the capacitors are discharged through the current-stabilizing elements 5. The current-carrying resistors of these stages are selected to adjust the speed and discharge. Since the current supply resistor in generator 2 is connected to a power source, for 1 capacitor 6, the voltage has a linear sawtooth shape. The distance from the sawtooth signal is applied to a block of a constant level 7. Using the potentiometer in block 7, one can adjust the value of the constant component of the signal, and therefore the symmetry of the S-shaped correction of the upper and lower half-wave of the output signal. The signal is then fed to the rectifier 8. The second constant level shift unit 9 shifts the constant signal level by the amount of the supply voltage. The output signal from block 9 is fed to the input of the emitter follower 1. The position of the variable resistor slider can change the value of the variable component of the signal at a constant constant value equal to the magnitude of the positive supply voltage. This signal is fed to the current-supplying resistor of the current-stabilizing element 5 of the second generator 3 of the sawtooth voltage, and the discharge current of the capacitor corresponds to the shape of this signal. Since the voltage on the capacitor is related to the discharge current by the formula

UrW 7 3 (tlcJi,

where c is the capacitance of the capacitor 6, then. the voltage on the capacitor 6 of the generator 3 is made up of a linear and quadratic component, i.e. it has an S-shape, and the value of S-shaped, determined by the value of the quadratic component; and varies depending on the magnitude of the variable component of the discharge current, i.e., the position of the slider of the variable resistor. This device is designed to generate a sweep in the range from tens of 4 seconds to hundreds of milliseconds, so the delay of the signals in blocks 7, 8 and 9 does not affect the operation of the device.

Due to the introduction of new blocks and the change of constructive links in the proposed S-correction device, the saw-tooth voltage is performed by blocks that do not contain frequency-dependent elements.

The proposed device is characterized by the symmetry and stability of the parameters S - the correction of the sawtooth voltage not only at a fixed frequency input

pulses, but also at a variable frequency of the input pulses and in the Single mode, which is an advantage of the proposed device in comparison with the known ones.

Claims (1)

DEVICE FOR FORMING A SAW OF 5-CORRECTION, containing an emitter follower, the first and second sawtooth generators, each of which consists, for example, of a key, the input of which is connected to the input of the device, the output - with the connection point of the current-stabilizing element and the capacitor connected in series characterized in that, in order to increase the accuracy of S-correction of the sawtooth voltage during operation of the device from control pulses of variable frequency, it is sequentially introduced with the first constant-level shift unit, a rectifier, the second constant-level shift unit, the output of the current-stabilizing element of the first generator of the sawtooth voltage connected to the input of the first shear block of the constant-voltage level, the regulated output of the emitter follower connected to the control input of the current-stabilizing element of the second sawtooth voltage generator, and the input with the output of the second constant level shift block.