SU421110A1 - GENERATOR RECTANGULAR PULSES - Google Patents

Description

one

The invention relates to a pulse technique and can be used in automation and computing.

A known generator of rectangular pulses according to the main author. St. No. 303714, containing a transistor, in the base of which a tunnel diode is connected, and the time specifying an RC circuit connected to the anode of a semiconductor diode. The cathode of this diode is connected with the collector of the transistor through a counter-switched diode.

The aim of the invention is to stabilize the pulse duration when the supply voltage changes.

This is achieved by the fact that a voltage divider is formed from a resistor in the discharge circuit of the time of the driving capacitor. The output of the divider through the first additional diode is connected to the lining of the additional capacitor, the other lining of which is grounded, and through the series-connected additional tunnel and second semiconductor diodes to the capacitor lining of the master circuit.

A base-emitter junction of the first additional transistor is connected parallel to the additional tunnel diode. An additional resistor voltage divider is connected to the collector of the latter, the output of which is connected to the base of the second additional transistor, switched on by a junction

collector - emitter parallel to the main tunnel diode, and an additional output of the generator.

The drawing shows a diagram of the generator. The generator contains the main transistor 1, the tunnel diode 2, the diodes 3, 4, the capacitor 5, the time of the wired circuit, the divider on the resistors 6, 7, the additional transistor 8 of the same conductivity as the MAIN, series-connected tunnel diode 9, diode

10, a capacitor 11, a diode 12, a voltage divider across resistors 13, 14, and a conduction transistor 15, inverse to transistor 1.

In the initial state, all transistors in the circuit are closed, the tunnel diodes are in the low voltage state. Capacitors 5 and 11 are charged, current does not flow through diode 10. A positive impulse arriving at INPUT 16 transforms diode 2 into a high voltage state. The pick-up switch 1 opens, the capacitor 5 starts to discharge through the resistors 6, 7 and the tunnel diode 2. At the same time, the discharge diode 2 is maintained in the HIGH voltage condition. As soon as the capacitor 5 is reduced to the voltage across the capacitor

11, the near-right one also begins to discharge in the discharge circuit of the capacitor 5. In the circuit of the diodes 9, 10 a current arises, switching the diode

9 In high voltage condition. Transistor 8 opens, the voltage from capacitor II enters the base of transistor 15, which opens and shunts diode 2, as a result of which it switches to the low voltage state.

Transistor 1 is locked, capacitor 5 begins to charge, and at the end of the charge, the circuit changes to the initial state.

Stabilization of the duration of the first pulse of the first impulse is based on the fact that the capacitor discharges the drive circuit time to a voltage that forms part of its charge voltage. The value of this pair is remembered by the capacitor 11 and, depending on the magnitude of the supply voltage, may be different. However, this value is always a constant part of the capacitor capacitor 5.

Subject invention

Rectangular pulse generator but aut. St. No. 303714, characterized in that.

that, in order to stabilize the duration of the pulse when the supply voltage changes, the resistor divider voltage across which the additional capacitor plate, the other plate of which is grounded through the first additional diode, is connected at the price of the discharge time of the capacitor and the second semiconductor diodes capacitor plate, the time of the setting value, moreover, the base-emitter of the first don is connected parallel to the additional tunnel diode ADDITIONAL transistor and to the collector of the last nodklyucheny donolnitelny resistive voltage divider, to the output whose base prisoedpnena second additional transistor included perehodo.m collector - emitter diode parallel to the main tunnel and the additional generator output.

You 2