SU406304A1 - PULSE SERIES GENERATOR - Google Patents

Description

This invention relates to a pulse technique. A molset device can be used as a pulse generator of voltage pulses of the type lgeander. A serous Il-guls generator is known that contains a source of clock pulses connected to the trigger input, in which 6d of the calls of the basic connections contain a parallel connection of one collectivesato, pa with a chain consisting of a series-connected diode and a second capacitor. The purpose of the invention is to reduce the effect of transient processes on the duty cycle of the output and pulses of the device. For this, in the proposed generator, the common point of the dyad and the second capacitor is connected via an additionally introduced resistor to the power supply source. FIG. 1 shows the pr. Ization and electrical circuit of the proposed generator; on f.№g. 2 - voltage diagrams. The generator contains a source of clock pulses / -r and a trigger on transistors 2. And 3. One of the collector-base connections of the trigger is made in the form of a parallel-connected capacitor 4 and a chain from a series-connected diode 5. And a capacitor 6 The common point of diode 5 and. Capacitor 6 through a resistor 7 is connected to the source: NiK) at the power supply ". Due to the change of one of the connections, the circuit has only one stable and ground state, at which the transistor 2 is locked, and the transistor 3 is open. At the base of the transistor 2, the potential is equal to the source voltage, and on the capacitor 6 plate connected to the resistor | M 7, the potential is negative and is equal to the total, voltage drop across the open | transistor 3 and the diode 5. 1 Fused; a pulse of series a (fig. 2) hits the collector of the locked transistor 2 and through the capacitor 8 - at the base of the open transistor 3. The transistor 5 is locked, O | T1p.I1tsa | telny voltage drop occurs on its collector, which after differentiation by the capacitor 4 and resistor 9 is applied to base t anzistora 2. Transit. 2 opens, the voltage on its collector becomes close to 1M to zero, whereby the transistor 3 is kept in the locked state after the first AND (Mpuls of series A.). When the transistor 3 is blocked and the diode 5 turns off the circuit consisting of capacitor 6 and dio (yes 7, from collector transistor. par 3, and capacitor 6 begins to charge through the base transition of transistor 2, resistive source 7 and power source Ek. Since the time constant of the circuit, consisting of capacitor 6 and diode 7, several times longer than the constant time of the chain.

consisting of a capacitor 4 and ipesHCTOipa 10, the generator remains in a temporarily stable state, and after a full charge of the capacitor 4. The voltage at the point of transmission to; 0 ndensor 6 and resistor 7 is shown in diagram B. The diagram in Figure shows the form of the voltage at the base of the transistor 2. In the actual; m state, this voltage is set by the supply voltage + EO, and in a temporarily stable state, it is negative and is determined by the circuit parameters.

The second clock pulse is fed to the collector of the transistor 3.

This pulse, having passed the capacitor 4, closes the transistor 2, overturns the circuit to its original steady state, with the office transistor 3 and diode 5 open, and a positive voltage difference equal to the voltage of the capacitor 6 charge between the first. and the second clock pulse, is applied to the base of transistor 2. During the time between the second and third clock and pulses, the capacitor 6 is discharged through the open transistor 3 and diode 5, resistor 9 and: source IN Ik.

Since the absolute value of the source voltage is greater than the absolute value of the source voltage + Eb, the discharge rate of the capacitor 6 is less than the rate of its charge for the initial pulses of the cross section; and therefore, by the beginning of the third pulse, the voltage on the base of transistor 2 exceeds the source voltage -ffe.

If the number of ILMspuls in se.rii is even, the last and, the pulsator, overturns the generator to its original state. If the number of pulses is odd, the last pulse translates the generator into a temporarily stable state, and after some time m, determined by the ratio of the resistances of the resistors 7 and 9 and the frequency of the following wi and pulses of the circuit;

returning to steady state, after which the capacitor 6 is discharged.

Self-oscillating (generator growth occurs as a result of a decrease in the charge current of capacitor 6 below a certain threshold value, at which transistor 2 exits, and the positive feedback in the circuit begins to exceed one in the circuit and higher.

0 Series g negative output pulses are removed from the collector of transistor 3, and positive - from the collector of transistor 2.

The scheme has the property of adapting the duration of a temporarily steady state. This means that with an odd number of pulses in a series: and the duration of the last output pulse varies in accordance with the tracking period of the triggering impulses, thanks to which the output ratio of the output I1M pulses remains constant for each period of the series in a wide range of the following frequency. input clock pulses.

Subject. And z obretyn.

A pulse train generator containing a source of clock pulses, an impulse connected to a trigger input, in which one of the collectors and circuits with / holds a parallel connection of a single capacitor to a chain diode consisting of a series-connected diode and a second co-capacitor, different that, in order to reduce the effect of the transient output on the duty cycle of the output pulses, the common point of the diode and the second capacitor is connected through an additionally introduced resistor to the power supply voltage.

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