SU1370746A1 - Device for transforming pulse duration - Google Patents

Abstract

The invention can be used in time domain measurement systems, as well as in converters of pulse signals. The purpose of the invention — enhanced functionality — is achieved by generating pulses with a duration shorter than the duration of the input pulse. The device contains input bus 1, comparator 2, charging circuit 3, first diode 4, capacitor 5, second diode 6, charging circuit 7, output bus 8. The duration of the output impulse of the device depends on the duration of the input pulse. The transformation ratio of the pulses depends on the setting of a given value of the currents of the charge and discharge circuits 3 and 7 and allows you to increase or decrease the duration of the output pulses. 3 il. WITH/)

Description

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The invention relates to a pulse technique and can be used in time domain measurement systems, as well as in converters of pulse signals.

The purpose of the invention is to extend the functionality by forming pulses with a duration shorter than the duration of the input pulse.

FIG. 1 is an electrical functional diagram; FIG. 2 is a timing diagram explaining his work; FIG. 3 shows an example of making a charge (discharge) circuit.

The device contains an input bus

1 connected to the first input of the comparator 2 and through a series-connected charging circuit 3 and the first diode to the second input of the comparator

2, the first plate of the capacitor 5 and the first terminal of the second diode 6, the second terminal of which is connected via an discharge circuit 7 to the output of a comparator 2 connected to the output bus 8, the second plate of the capacitor 6 is connected to a common bus.

A comparator 9 can be connected to the output of the positive polarity to obtain the output polarity of the comparator 2.

The charging circuit 3 contains a transistor 10, the collector of which is the output of the charging circuit, the emitter through resistor 11 is connected to the input of the charging circuit and the cathode of the stabilizer 12, and the base to the anode of the Zener diode 12 and through the resistor 13 to the common bus.

In constructing the discharge circuit, an npn transistor is used, and the polarity of the zener diode is reversed.

The device works as follows.

In the absence of input pulses on bus 1 (Fig. 2a), comparator 2 is set to a position where its output is high (Fig.), Diode 6 is shifted in the opposite direction and there is no current through it. In this case, the output of the comparator 9 is a low level of the logical signal (Fig. 26). When a pulse arrives on bus 1, capacitor 5 is charged through the charging circuit 3 and

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od 4 (Fig. 2cH); In this case, the states of comparators 2, 9 are unchanged.

By an eye, the input pulse at the inverting input of the comparator 2 is set to zero, while the signal at the inverting input is proportional to the duration of the input pulse, so the negative polarity is set at the output of the parator 2, and the positive voltage at the output of the comparator 9 which determines the beginning of the output positive pulse.

For a further time, the capacitor 5 is discharged through the discharge circuit 7 and diode 6, while the diode 4 is biased in the opposite direction and does not conduct a current, which eliminates the error of pulse transformation due to reverse collector currents of the transistor 10 of the charging circuit 3. Thereafter as the voltage on the capacitor 5 becomes more negative than the voltage on the input bus 1, the output of the comparator 2 becomes positive again, and the output edge of the output pulse is formed at the output of the comparator 9. The greater the duration of the input pulse, the greater the duration of the output pulse. The transformation ratio of the pulses due to the installation of a given value of the currents of the charging and discharging circuits 3 and 7 can be made both less than the duration of the input pulse, and more.

Claims (1)

Invention Formula A device for transforming the pulse duration, containing an input bus connected to the input of the charging circuit, a discharge circuit, a comparator, the first input of which is connected to the first capacitor plate, the second plate of which is connected to the common bus, the output bus , in order to extend the functionality due to the formation of pulses with a duration shorter than the duration of the input pulse, two diodes, the anode of the first of which is connected to the output of the charging circuit, and the cathode - to the first input of the comparator and the anode of the second diode, the cathode of which is connected to the output of the discharge home of the comparator connected to the VG /, " ra is connected to the input bus. FIG. 2 ts