SU471658A1 - Generator - Google Patents

Description

one

The invention relates to a pulse technique and can be used in various radio devices, for example, as a master oscillator, the pulse frequency of which is controlled by a resistor.

A known generator containing an integrating C-circuit connected between the power supply buses, a pn-transistor connected by an emitter to the output of the / C-circuit, and the base to a resistive voltage divider and collector of the first p-p- / g- a traisistor whose base is connected to a pn-jt7-TpaH3HCTOpa collector, and a second pn-n transistor whose emitter is connected to a common bus.

However, the known device has an insufficient coefficient of overlap in the pulse frequency.

The aim of the invention is to increase the pulse overlap rate.

To do this, in the generator, the second pn-transistor is connected by a collector through a resistor to the base, and the base to the emitter of the first p-jE7 - “- transistor connected to a common bus through a resistor.

The drawing shows the electrical circuit of the generator.

The generator contains three transistors 1, 2,

3, an integrating circuit formed by a capacitor 4 and a resistor 5, a voltage divider consisting of resistors 6 and 7, resistors 8. and 9.

The generator works as follows. At the first moment after powering up, the voltage on the capacitor 4 is zero. The voltage at the base of transistor 1 is equal to the voltage taken from the divider formed by resistors 6 and 7. This voltage is blocking for transistor 1. The remaining transistors will also be closed. Voltage on capacitor 4, age

exponentially, it tends to the voltage level of the power source. When it is compared with the voltage removed from the divider across resistors 6 and 7, transistor 1 will begin to open. With some

the emitter current of transistor 1, the gain across the loop formed by transistors 1 and 2, is greater than one. As a result of this avalanche-like process, transistors 1 and 2 become saturated. This process corresponds to the leading edge of the pulse. The transition process of transistors 1 and 2 from the closed state to the saturated transistor 3 has no effect, since

stage it remains closed.

Transistors 1 and 2 are maintained in a saturated state by discharging capacitor 4. During the time that the discharge current of capacitor 4 is sufficient to keep transistors 1 and 2 in a saturated state, the top of the pulses is formed. At this stage, the voltage removed from the resistor 8 is large, so the transistor 3 is open and saturated. Resistor 9 through a saturated transistor 3 connects to a common point of the generator, shunt the input circuit of transistor 2. In order for transistors 1 and 2 to go from a saturated state to a closed state, it is necessary that the current through the timing resistor 5 in this phase of operation is not sufficient to saturate the transistors 1 and 2.

Bypassing the input circuit of transistor 2 allows the current to be increased through the resistor 5 to increase, i.e., to reduce its minimum possible resistance. As capacitor 4 is discharged, the emitter current of transistor 1 tends to flow through resistor 5, and at some point in time transistors 1 and 2 will go out of saturation and the gain across the loop formed by transistors 1 and 2 will exceed one. As a result of the avalanche process resulting from this, transistors 1, 2, and 3 will go to the closed state. This process corresponds to the leading edge of the pulse. Then all the processes are repeated.

Subject invention

A generator containing an integrating C-circuit, connected between the power source, a p -p transistor connected by the emitter to the output 7 of the C-circuit, and the base - to a resistive voltage divider and collector of the first pnp transistor, the base which is connected to the collector of a pnp transistor, and the second pn-to-transistor, the emitter of which is connected to a common length, characterized in that

the increase in the overlap coefficient in terms of the pulse repetition rate, the second np-transistor is connected by a collector through a resistor to the base, and the base to the emitter of the first np-ft transistor

through a resistor to the common bus.