SU1252926A1 - Pulse duration conditioner - Google Patents

Abstract

This can be used in the development of pulse generators. The purpose of the invention is to reduce the recovery time of the circuit. The driver contains an RS flip-flop 5, a self-oscillating multivibrator 2, the input 3 of the former, an emitter follower 4, a diode 5 and the output 16 RS-flip-flop is made on ECL-vents x 7 and 8 with load resistors 11 and 12. The multivibrator is made on an ECL valve 6 with load resistors 9 and 10, a capacitor 13 and a chain of resistors 14 and 15, one of which is control. Enable Smitter Repeat A parallel to a resistive charge-discharge circuit and ensuring its opening at the moment the capacitor starts to discharge and closes at the moment the charge starts, which in turn is achieved by the combined use of a diode, a transistor and an RS flip-flop, allows to achieve a positive effect. 2 ill.

Description

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The invention relates to a rexFiUKe pulse and can be used in the development of impulse generators.

The purpose of the invention is to reduce the recovery time of the circuit.

Fig. 1 shows the electrical circuit of the driver; in fig. 2 - temporary diagrams of his work.

The pulse width former contains trigger 1, self-oscillating multivibrator 2, input 3 of the imager, emitter follower 4, diode 5. Multivibrator 2 and short-circuit trigger I are made on ECL ventilator x 6-8 with load resistors 9-12, multivibrator 2 contains a valve 6, a capacitor 13 and a chain of two series-connected resistors 14 and 15, one of which is regulating. The shaper has an output of 16.

Shaper pulse duration works as follows.

In the initial state, the valve 6 is closed by supplying the inhibitory potential to its input from the single output of the trigger 1. Then the direct output of the valve 6 will have the potential of logical 1, and the inverse potential of logical o. In this case, capacitor 13. is discharged to the potential of logical O (Ug,, Fig. 2). With the arrival of a short positive pulse generated between ECL levels at input 3, trigger I jumps over and causes switching of valve 6. Then the direct output of valve 6 will have a potential of logical O, and the inverse - of logical I. Condenser 13 will begin to charge through resistors 14 and 15, and as soon as the potential on it reaches the valve tripping voltage 6 (U), it will switch regeneratively and, in turn, will cause the trigger 1 to switch to the initial state. At the time when the trigger switches to the initial state, the emitter follower 4 is opened and the capacitor 13 is quickly discharged to the initial level due to the small output resistance of the emitter follower 4 (2-3 Ohms).

Diode 5, included in the forward direction, is designed to compensate for the direct voltage drop across the circuit.

2529261

the base-emitter of the emitter transistor is repeatable 4. In those cases when it is necessary to generate pulses of minimum duration H 5 5 NS, first, reduce the capacitance of the capacitor 13 to the installation capacitance and, second, reduce the resistor 14 (resistor 15 is equal to zero ), because of which the efficiency of using only the diode K to reduce the recovery time of the circuit is lost, since the resistance of the resistor 14 at the same time is comparable to the effective or even less direct resistance of diode 5, which is 30-50 Ohms. Turning on the emitter follower 4 parallel to the resistive branch of the charge - discharge circuit and ensuring its opening at the time of the start of the capacitor 13 and closing at the time of the start of the charge (achieved due to the combination of the use of diode 5, the transistor and the trigger 1) .

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Claims (1)

Invention Formula A pulse length shaper containing a trigger, a single output of which is connected to the control input of a self-oscillating multivibrator, the output of which is connected to A first trigger input, the second input of which is a driver input, characterized in that. that, in order to reduce the recovery time, a diode and an emitter follower on a p-h-p type transistor are introduced into it, the base of which is connected to the cathode of the diode, the collector is the trigger bus is triggered on the ECL fans, the inverse trigger output through the serially connected diode and the first load resistor, and the direct output through the second load resistor connected to the power bus, while the self-oscillating multi-vibrator contains an ECL gate with load resistors connected to bus food the first input of which is connected via a capacitor to the direct output of an ECL valve, which is an output of a self-oscillating multivibrator, the inverse output of an ECL valve through a series-connected regulating resistor and a resistor connected to the first input of an ECL valve and an emitter follower emitter. Editor A. Koeorie Compiled by M, Leonova Tehred M. Hodannch Proofreader A. Obruchar Order 4630/56 Circulation 816 Subscription VNIIPI USSR State Committee for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., D. 4/5 Production and printing company, Uzhgorod, st. Project, 4 Fig2