SU1239846A1 - Sawtooth voltage generator with automatic amplitude control - Google Patents

Abstract

The invention can be used in multiple devices, modulation and various automation devices. The purpose of the invention is to increase the reliability of the device. The generator contains a reversible counter I, a converter 2 code — an analog, a current-stabilizing two-terminal 3, a bit switch 4, a comparator 5, an amplitude adjustment unit 6. Introduction to the device of the elements 7 and 9, the trigger 8 of the control, the driver 1I of the reference pulses and their connection with the elements of the device contribute to the fact that the false triggering of the comparison circuit (for example, as a result of the interference of the reference voltage of the comparator 5) changes the amplitude the output voltage is only one discrete, and not to the operation of the discharge switch 4. In this case, the stability of the output voltage amplitude is increased. 3 il. (L SO cx 4 .H

Description

one

The invention of otiopits to a pulse technique and can be used in multiple modulation devices and various automation devices.

The purpose of the invention. is to increase the reliability of the device by increasing the noise immunity while increasing the stability of the amplitude of the output Hail.

Figure 1 shows a structural diagram of a sawtooth generator; in fig. 2 - impulse diagram of his work; Fig. 3 shows stress plots showing the operation of the device. steady state conditions,

The generator contains a reversible meter 1, a converter 2 code - an analogue, a current-stabilizing two-terminal device 3, a bit switch 4, a comparator 5, an amplitude control unit 6, made, for example, in the form of a variable resistor, powered by a stabilized nanometer source. or in the form of a digital-to-analog converter 5, a code-controlled element I 7, an 8-control trigger, an element 9, a storage capacitor 10, a driver of the I reference pulses 5 controlled by a code.

In this case, the outputs of the reversible counter 1 are connected to the inputs of the inverter 2, whose output through a two-port stabilization bipolar 3 is connected to a storage capacitor 10, the output of the discharge switch 4: and the first input of the comparator 5, the second input of which is connected to the output of block 6 amplitude adjustment, R- trigger input connected to the output of comparator 5, C input to the output of the first element 7 and the subtraction input of the reversible counter 1, direct and inverse outputs of the trigger 8 are connected to the first 1 inputs of the second 9 and first 7, respectively And, the second inputs of which are connected to the output of the driver 1 of the reference pulses and the control input of the discharge key .4 and the output of the second gate And is connected to the input of the summation of the reversible counter 1.

The device works as follows.

In the initial state, the frequency FQ is absent at the output of shaper 11. When this reversible counter 1

0 5 Q

five

five

0

five

462

zero, the analog code is removed from the converter 2; the voltage is zero, the capacitor 10 is accumulated, the control trigger 8 is in the state O, there is no signal from the output of the comparator 5, the saw does not form a voltage.

The generator starts to work when the reference frequency pulses are generated (Fig. 2a). At the same time From the direct output of the trigger 8 to the first input of the element And 9 receives the enabling signal (Fig.2 o), and from the inverse output to the first input of the element And 7 - prohibiting signal (Fig 2o). From control unit 6 of the control unit, the first input of the comparator 5 receives a signal that determines the magnitude of the peak voltage.

From the driver JI of the pulses — the reference frequency, control pulses come to the summing input of the reversible counter 1 through the open element I 9. An increase in the code in the reversible counter I causes a proportional increase in the transducer voltage of the converter — analogue 2 (FIG. 22), which leads to a proportional change in the current through the current-stabilizing bipolar 3 and a change in the charge slope of the storage capacitor 0 (FIG. when the amplitude of the lilo-shaped voltage exceeds the signal from the amplitude control unit iop (Fig. 2), a pulse is removed from the output of the comparator 5 (Fig. 2e), which switches the control trigger 8 at the R input. entry element And 7 enters permissive - level (figure 2 | 5), and the first input element And 9 - prohibiting (fig.2i).

with

Thus, the next impulse (saddle frequency through the element And 7 will go to the input of the subtraction of the reversible counter 1 and the falling edge will set the trigger 8 on the C input to the initial state (Fig. 3.). Reducing the code in the reversing counter 1 causes a proportional clever- The output voltage of the converter is code-2, which, in turn, leads to a decrease in the slope of the saw-tooth voltage (Fig. 23, S, 3). In this case, the amplitude value of the saw-tooth voltage.

stabilizes at a set level with an accuracy of one discrete transducer; the code is analog (+ L, FIG. 2).

Improving the reliability of the device is due to the fact that the false triggering of the comparison circuit (for example, as a result of interfering with the reference voltage of the comparator 5) leads to a change in the amplitude of the output voltage only by one discrete D, and not to the triggering of the discharge key, as it happens in a known device. Accordingly, the output voltage stability increases.

Claims (1)

Invention Formula X Saw-shaped voltage generator with automatic amplitude adjustment, containing a reversible pulse counter, the discharge outputs of which are connected to the converter inputs; the code is an analogue, the output of which is through current-stabilizing the two-port device is connected to the storage capacitor, the output of the bit switch and the first input of the comparator, the second input of which is connected to the output of the amplitude control unit, characterized in that, in order to increase the reliability of operation while increasing the output amplitude stability the sawtooth voltage, the first and second elements AND, the driver of the reference pulses and the trigger, the R input of which is connected to the output of the comparator, the C input of - with the output of the first element AND and the subtraction input of the reversible pulse counter, and the direct and inverse outputs of the trigger are connected respectively to the first inputs of the second and first elements AND, the second inputs of which are connected to the output of the reference pulse former and the control input of the dongle, and the input of the second element And connected with the summation input of the reversible pulse counter. Fi (g.2 Editor A. Shandor Compiled by S. Klevtsov Tehred N. Bonkapo Proofreader G. Reshetnik 3408/56 Circulation 816 Subscription VNIIPI USSR State Committee for inventions and discoveries 1,13035, Moscow, -ZH-35, Raushsk nab., d.4 / 5 Production and printing company, Uzhgorod, Projecto st., 4 Fig.Z