SU411611A1 - - Google Patents

Description

one

The invention relates to radio engineering and can be used to obtain short, stable pulses, adjustable in duration.

Known pulse generator containing a resistive-capacitive symmetric bridge and two regenerative key transistors of different types of conductivity.

However, the known generator does not provide for the formation of frequency-consistent and duration-controlled multi-polar pulses with an amplitude close to the voltage of the power source.

In order to form stable but frequency and time-varying different-polarity pulses with an amplitude close to the voltage of the power source, series-connected resistors and an emitter-transistor base corresponding to its regenerative key are included in the bridge diagonal.

The drawing shows the principal electrical circuit of the proposed generator.

The proposed generator contains a resistive-capacitive symmetric bridge, consisting of resistors 1 and 2 and capacitors 3 and 4, and two regenerative keys on transistors 5, 6 and 7, 8. Transistors 5, 6 and 7, 8, included in the key circuits , have a different type of conductivity.

In the diagonal of the bridge between the connection point of resistor 2 and capacitor 4 and point

The connections of the resistor 1 and the capacitor 3 are connected in series with the resistor 9 and the base-emitter section of the transistor 5 of the regenerative switch. This day forms a null organ.

In the bridge diagonal between the connection point of resistor 2 and capacitor 3 and the connection point of resistor 4 and capacitor 4 are connected in series the resistor 10 and the switch formed by transistors 7 and 8. This circuit serves to discharge the capacitor 4.

The pulse generator works as follows. After turning on the power transistors 5,

6 and 7, 8 are reliably locked due to small (almost zero) values of reactance in the arms of the bridge. From this moment on, capacitors 3 and 4 begin to charge. Upon reaching the balance of the bridge, the regenerative switch is triggered on transistors 5 and 6, which, unlocking an avalanche, discharges capacitor 3, thereby forming the leading edge of the pulse received from the zero-body at the connection point of the resistor 9 and the base-to-emitter junction of the regenerative switch five).

At the same time, the charging of capacitor 4 continues through parallel-connected resistors 2 and 9 to the magnitude of the processing voltage of the regenerative key on transistors 7 and 8. The key on transistors 7 and 8, like an avalanche, discharges the capacitor, 4, forming the rear edge of the pulse and the leading edge of the reverse polarity pulse removed from the resistor 10.

The regenerative switch on transistors 5 and 6 is locked at the moment of discharge of the capacitor 4. Then the process repeats.

The diagonal of the symmetric bridge includes a series-connected resistor 9 and an emitter section — the base of the transistor of the corresponding regenerative key, which results in increased stability.

Adjusting the pulse width is obtained by varying the resistance of the null organ.

Subject invention

A pulse generator containing a resistive-capacitive symmetric bridge and two regenerative keys on transistors of different conductivity types, characterized in that, in order to form frequency-stable and adjustable-duration, different-polarity pulses with amplitude close to the voltage of the power source, to the diagonal of the bridge connected in series are the resistor and the emitter section - the base of the transistor of the corresponding regenerative key.