SU391722A1 - LOW-FREQUENCY PULSE GENERATOR - Google Patents

Description

one

The invention relates to radio engineering and can be used in stable low frequency generators, to the output of which frequency dividers are connected, made on triggers.

A generator of low-frequency pulses is known, which contains an LC-generator on an oleval transistor with a C-circuit of the automatic α-bias and a pulse arrester made on a transistor.

The purpose of the invention is to increase the steepness of the front ends of the output pulses.

For this, the gate of the field-effect transistor is connected via a capacitor to the collector of the pulse limiter transistor and through a resistor to the connection point of the capacitor and the resistor of the automatic bias circuit.

FIG. 1 shows the conventional electrical circuit of the proposed generator; in fig. 2 - stress diagrams.

The generator of low-frequency imiulsov contains LC-generator on a lolev transistor /, assembled according to a three-point scheme. The LC oscillator circuit consists of an inductance coil 2 with a tap and a capacitor 5. The auto-bias circuit of the LC generator contains a capacitor 4, a resistor 5 and a diode 6. The base of the transistor 7, which is a pulse limiter, is connected to the field-effect transistor table. The gate of the field-effect transistor / through the capacitor 8 is connected to the collector of the transistor 7, and through a resistor 9 to the connection point of the capacitor 4 and resistor 5.

The load on the drain of the field-effect transistor / is a resistor 10; the load of transistor 7 is resistor 11. The generator output is the collector of transistor 7. Transistor 1 operates in the drain current cut-off mode. On the resistor 10, pulses are generated across the voltage, which are then limited and amplified by the transistor 7.

FIG. 2a, a voltage plot of diode 6 representing a sinusoidal oscillation is shown. At the time of unlocking the transistor 7, the voltage drop created "on the resistor //, acts through the capacitor 8 on

the gate of the field-effect transistor / so that it contributes to an even faster detachment of the transistor 7. This leads to an abrupt increase in the voltage across the resistor 11. In FIG. 26 Showing impulses

on the gate of the field-effect transistor 1, arising at the time of opening of the transistor 7. FIG. 2b — current pulses of transistor 7. FIG. 2d - voltage pulses at the generator output (on the resistor 11).

Subject of invention

A low-frequency impulse generator containing an LC-reHepaTOp field-effect transistor with an automatic bias C-circuit and a pulse limiter made on a transistor, characterized in that

increasing the steepness of the fronts of the output pulses, the gate of the field-effect transistor through a capacitor is connected to the collector of the pulse-limiting transistor and through a resistor to the connection point of the capacitor and the resistor of the automatic bias circuit.

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