SU1504796A2 - Sawtooth current generator - Google Patents

Abstract

The invention relates to a pulse technique and can be used, for example, in the construction of master oscillators. The purpose of the invention, the expansion of functionality, is achieved by ensuring the formation of an S-shaped sawtooth voltage while simultaneously forming a parabolic voltage. Power is supplied to the device via bus 4, it is started up via bus 13. The S-shaped voltage is formed by a capacitor 24, resistors 18, 25, a variable resistor 26, an additional voltage divider 27. 2 Il.

Description

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31504796

The invention relates to a pulse technique and can be used, for example, in the construction of master oscillators.

The goal of the acquisition is to expand the functionality by ensuring the formation of an S-shaped sawtooth voltage while simultaneously generating pa-10 rabolic voltage.

Fig. 1 shows the electrical circuit diagram of the generator; in fig. 2 - plots showing his work.

The sawtooth voltage generator 15 contains the first resistor 1, the first capacitor 2, the operational amplifier 3, the output of which through the first capacitor 2 is connected to an inverting input connected through the first resistor 1 to the source bus 4, a power supply, a discharge device 5, for example, ya transistors connected in parallel to the first capacitor 2, the divider 6 is the voltage across the resistors, the first input of which is connected to the output of the operational amplifier 3, the second input to the common bus, the switching amplifier 7

To the torus, the second resistor a, the second con- nector, the U capacitor 9, the block 10 for fixing the signal level, is made, for example, on a capacitor 11 and a diode 12, whose input is connected to the bus 13 of the synchronization pulses j and the output to the input of the 35 amplifier 7 on the field transformer, the output of which is connected in parallel to the second resistor 8 and the second capacitor 9 is connected to the output of the divider 6 voltage on the switches 40 tori and the input of the discharge device 5, additional transistor 14, additional capacitor 15, additional diode 16 additional resistors 1 7-22 and an additional 45 operational amplifier 23, whose input is connected via the first additional resistor 17 to the output of the operational amplifier 3, and through an additional capacitor 15 to its own output, which is connected to the base of the additional transistor 18 which is connected via an additional diode to the output of a pulse-5 amplifier 7, the emitter of an additional transistor 14 is connected via the third additional resistor 19 to the bus of the device, and the collector is directly connected to the The operating amplifier 3 has a non-inverting input terminal which is connected via a quarter additional resistor 20 to the device common bus, and through five additional resistor 21 to a power supply bus 4 which is connected to the input of the bit element 5 through the sixth additional resistor 22 additional capacitor 24, seventh additional resistor 25, variable resistor 26, additional voltage divider 27, the first input of which is connected to the inverting input, additional operational amplifier 23, output to its noninverting input, second input to the device common bus; second additional capacitor 24 connected between the non-inverting input of the additional operational amplifier 23 and the device common bus; seventh additional resistor connected between bus 4 of the power supply and the anode additional diode 16, the first fixed contact of the variable resistor 26 and the moving contact are connected between the anode of the additional diode 16 and the base of the additional transistor 14, the second fixed contact of the variable resistor ra 26 is connected to the common bus device.

The sawtooth generator operates as follows.

When the supply voltage is applied and in the absence of external clock pulses, a sawtooth (Fig. 2a) is formed at the output of the operational amplifier 3, and parabolic (Fig. 26) at the output of the amplifier 23. In the drain of the field-effect transistor, which is the output of the pulse amplifier 7, the potential is set to be close to zero. This potential through diode 16 is applied to resistor 26. Transistor 14 is closed, while the inverting input of amplifier 3 is not affected by parabolic voltage. The discharge device 5 is turned on by the output of the sawtooth voltage when it reaches a certain level and discharges the capacitor 2. Then the cycle of the formation of the sawtooth voltage is repeated.

With the application to the generator of the synchronization signal from the bus 13 (Fig. 2c), its vertices are fixed

by means of a capacitor 1I and diode 12 of the fixing unit 10. From the output of the pulse amplifier 7, the voltage is removed (Fig. 2d), having a value of, well, equal to the voltage of the power source in the time intervals between the sync pulses and close to zero at the moments of the sync pulse. This voltage in the time intervals between the sync pulses has a polarity opposite to the switching voltage of the device 5. To turn on the discharge device 5, the total voltage (voltage from the outputs 15 of the divider 6 and the amplifier 7) requires more than in an unsynchronized mode, the output voltage from the divider 6, which corresponds to a decrease in the natural frequency of the generator. 20 The bit device 5 is switched on by a voltage drop from the pulse amplifier that coincides in phase with the leading edge of the synchronization signal. The voltage from the output of the pulse amplifier 7 at the time intervals between the sync pulses closes the diode 16, and the parabolic voltage (Fig. 2e) at the junction of the resistors 25 and 26 creates an adequate form current that reaches the base of the transistor 14. Through junction collector - emitter of transistor 14 flows a current proportional to the base. At the output of the generator, a S-shaped sawtooth voltage is obtained; a 5-shaped S-shaped voltage;

Thus, at the output of the amplifier 3, an S-shaped sawtooth voltage is formed (Fig. 2h) j.

there is a separate output from an amplifier | 23 with a parabolic voltage | (fig. 2k) of unchangeable amplitude.

Applying the invention will make it possible to obtain a sawtooth generator with an adjustable (predetermined) H-shaped. having a separate output of a parabolic voltage of hundred bipnoy amplitude.

Claims (1)

Formula of inventions Sawtooth generator for example avtl st. No. 886224, about the fact that, in order to expand the functionality for enabling the formation of an S-shaped sawtooth voltage and the formation of a parabolic voltage, a second additional capacitor, the seventh additional resistor, is introduced into it, variable resistor, an additional voltage divider, the first input of which is connected to the inverting input of the additional operational amplifier, the output to its noninverting input, the second input to the common generator bus, the second one A capacitor is connected, between the non-inverting input of the additional operational amplifier and the total generator, the seventh additional resistor is connected between the power supply bus and the anode of the additional diode, the first fixed contact of the variable resistor and the moving contact are connected between the anode of the additional diode and the base of the additional transistor, the second the fixed contact of the variable resistor is connected to the common bus of the generator.