SU725205A1 - Pulse generator - Google Patents

Description

(54) PULSE GENERATOR

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The invention relates to a pulse technique and can be applied in automation devices and phase-pulse control systems. A pulse generator is known on a single junction and bipolar transistor 1. However, this generator does not provide for adjustments of the time at which the output pulses form during the entire period of the clock pulses (the pulses that control the start of charging of the time by the reference capacitance). The purpose of the invention is to obtain a regulation of the formation time of the output signals (1 pulses over the entire period of clock pulses. To achieve this goal, the pulse generator at the single junction and bipolar transistor, whose emitt is connected to the common bus, and the collector through the resistor is connected to the power supply bus, and through the diode emitter of a single junction transistor, the first base of which through a resistor is connected to the common bus, which is connected to one lining of the capacitor, a memory element and a zener diode are inserted, and This is connected to another plate by the time of the master capacitor, and the cathode by the emitter of the unijunction transistor, the second base of which is connected to the power supply bus through a regulating resistor, and the first base to one of the inputs of the Psm element, the other input of which is connected to the bus pulse clock, and the output - with the base of the bipolar transistor. The drawing is a schematic diagram of the generator. The pulse generator contains a single junction transistor 1, the time specifies the resistor 2 and the capacitor 3, the bipolar transistor 4 of the type pnp, em the terrain of which is connected to the common power supply bus, the diode 5 in the conductive direction relative to the current of the power supply, the anode of which is connected to the time by the driving resistor 2 and the collector of the bipolar transistor 4, and the cathode to the emitter of the single junction transistor 1, zener diode 6, the cathode of which connected to the cathode of the diode 5 and the emitter of the unijunction transistor 1, and the anode to the time of the driving capacitor 3, memory element 7, for example, a trigger, the output of which is connected to the base of the bi-polar transistor 4, the first

the input is connected to the generator 8 clock pulses, and the second to the first base of the unijunction transistor 1 and the load resistor 9, a variable resistor 10 connected by the outermost leads to the power supply 11, and an average output to the second base of the unijunction transistor 1. The second capacitor plate 3 and The second output of the load resistor 9 is connected to a common bus.

The pulse generator works as follows.

In the initial state, the single junction transistor 1 and the bipolar transistor 4 are closed. When the power supply 11 is turned on, the Zener diode B is ignited and the capacitor 3 is charged through the circuit: power source 11, power supply resistor 2, diode 5, zener diode b, capacitor 3, common bus. Thus, at the initial moment of time, the voltage on the emitter of the unijunction transistor 1, which is equal to the stabilization voltage of the zener diode b, is present. As the capacitor 3 charges, the potential of the emitter of the unijunction transistor 1 increases and, when it reaches the switching voltage, the single junction transistor 1 is avalanche switched. The capacitor 3 begins to discharge through the zener diode and the emitter circuit of the transistor 1 to the load resistor 9. Resistor 9 produces a positive pulse, which is fed to the output and to the second input of the memory element 7, for example a trigger. The trigger overturns into another steady state, in which the bipolar transistor 4 is opened. The voltage on the collector of the transistor 4 is close to zero. The same voltage on the anode of the diode 5. Voltage; at the cathode of this diode, it is positive and equal to the voltage at the emitter of transistor 1. Therefore, diode 5 is blocked. The charging current is now closed through transistor 4. As the capacitor 3 is discharged, the emitter current decreases and transistor 1 turns off. The transistor 4 is in the open state before the arrival at the first input of the memory element 7 of a clock pulse tilting the trigger, after which the transistor

4 locked. The process in the generator is repeated. When the voltage on the second base of the transistor 1 is changed with the help of the resistor 10, it is possible to change the threshold of its operation and thereby change the time of formation of the output pulses relative to the clock. When the voltage across the second base of the transistor 1 decreases, the delay time of the generated pulses decreases. When

the voltage across the emitter of transistor 1 will reach a value of 0, and. KUe, where UCT is. stabilization voltage zener b, K - transfer coefficient of a single junction transistor, the voltage at the second base, the time of formation of the output pulse will correspond to the clock pulse.

The zener diode is chosen for a stabilization voltage not less than the required magnitude of the output pulse voltage amplitude.

Claims (1)

The invention The pulse generator on a single-pass and bipolar transistor, the emitter of which is connected to a common bus, and the collector through a resistor to the power supply bus, and through a diode to the emitter of a single-junction transistor, the first base of which 0 through a resistor is connected to a common bus that is connected with one plate, the time of the driving capacitor, characterized in that, in order to obtain an adjustment of 5 times the formation of output pulses throughout the period of clock pulses, a memory element and a zener diode are inserted into it, the anode of which is connected to the other plate is the time of setting the capacitor, and the cathode is connected to the emitter of the single junction transistor, the second base of which is connected to the power supply bus through a regulating resistor and the first base to one of the inputs of the memory element, 5 the other input is connected to bus clock. impulses, and the output from the base of the bipolar transistor. Sources of information taken into account in the examination of 50 1. USSR Copyright Certificate №488325, cl. H 03K 3/335, 12.18.73 (prototype). Out one