SU362427A1 - ALL-UNION - Google Patents

Description

one

The invention relates to the field of pulsed technology and can be used in radio electronic devices for various purposes, in particular in devices for generating a signal in terms of duration.

One-shot emitter couplings are known, containing two transistors of the same conductivity, the emitters of which are interconnected, the master / C-chain time and the emitter follower on the transistor of another conductivity, which serves to reduce the recovery time.

A disadvantage of the known devices is the effect of parasitic capacitances on the speed of transient processes, which sets the C-chain relative to the circuit board body.

In order to eliminate the influence of parasitic capacitances on the speed of the transient processes relative to the circuit board case in the proposed device, one capacitor plate of the time setting the 7 C-chain is connected to the circuit board body and the other to the emitter of the emitter follower transistor and the base of one of the single-oscillator transistors The collector of which is connected through a resistor to the common point of connection of the base of the emitter-newer transistor and the base of the other single-transistor.

The drawing shows the scheme of the proposed device.

The single-oscillator contains transistors 1 2 p - p - p conductivity, connected by emitters, to which resistor 3 and emitter follower are connected on transistor 4 p-P - p conductivity, the base of the latter is connected to the base of transistor 4, and the emitter of transistor 4 is connected to the base of transistor 2. The emitter of the transistor 4 and the base of the transistor 2 are connected to the time of the master / C-chain, consisting of a resistor 5 and a capacitor 6, the second plate of which is connected to the circuit board body.

The collector of the transistor 2 is connected to the base of the transistor / through a resistor 7 of a divider consisting of resistors 8 and 9.

The resistor 10 is connected to the collector of the transistor 1. A control current signal source // is connected to the transistor bases.

; and 4.

In the initial state, the transistor / is closed, the transistors 2 and 4 are open. The control signal from source 11 opens transistor 1 and closes transistors 2 and 4. From this moment on, capacitor 6 begins to charge through resistor 5. The steady state of the single-oscillator during the formation of the output signal is maintained by the feedback voltage supplied from the transistor collector 2 at the base of the transistors I p 4. At the point in time when the base potential of the transistor 2 is compared with the base potential of the transistor /, the reverse regenerative process begins. The transistors open, the transistor / closes. The restoration of the original voltage on the capacitor 6 is carried out by the emitter follower current on the transistor 4. The output signal is taken from the resistor 10.

Thus, the duration of the output signals is determined by the resistor 5 and the capacitor 6. Since one plate of the capacitor 6 is connected to the circuit board housing, at the connection point of the other capacitor plate all parasitic capacitances relative to the circuit board housing are part of the capacitor capacitor time . In this case, the parasitic capacitances limit the minimum duration of the output signal, but do not affect the rate of transient processes in the oscillator.

Type of invention

One-vibrator with zmitterny connection, containing two transistors of the same conductivity,

the emitters of which are interconnected, the time of the master / C-chain and the emitter follower on the transistor of a different conductivity, which serves to reduce the recovery time, characterized in that

in order to eliminate the influence of parasitic capacitances, the time of the driving chain relative to the housing of the circuit board on the speed of transient processes, one plate of the capacitor is connected to the time of the driving / C-chain

The body of the mounting plate and the other are connected to the emitter of the emitter follower transistor and the base of one of the single-transistor transistors, the collector of which is connected via a resistor to the common connection point of the base of the emitter-repeater transistor and the base of the other single-transistor.

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