SU1320888A1 - Transistor switch - Google Patents

Abstract

The invention relates to a pulse technique and can be used in the construction of nanosecond pulse generators. The device contains transistors 1.1-1.N with resistors 2.1-2.N in collector circuits and 3.1-3.N in emitter circuits, capacitors 4.1-4.N, diodes 5.1-5.N, output bus 6, input bus 7, common bus 8, control pulse generator 9, internal resistance 10 of generator 9, power supply 11 and load 12. The invention improves the speed of a transistor switch made according to the proposed scheme by reducing the switching time of transistors. 2 Il. (Lg j- / 1-1 v j-at -o fi9. 1

Description

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The invention relates to a pulse technique and can be used in the construction of nanosecond pulse generators.

The purpose of the invention is to increase the speed by reducing the switching time of the transistors.

FIG. I shows the transistor switch circuit; in fig. 2 - bottom-. v grams of currents flowing through one of the transistors of the transistor switch

The transistor switch contains N transistors 1-1 ... 1-N, N collector resistors 2rl ... 2-N, N emitter resistors 3-1 ... 3-N, K capacitors 4-1 ... 4-N and N diodes 5-1 ... 5-N and the collector of each transistor 1-1 ... 1-N through the corresponding collector resistor 2-1 ... 2-N is connected to the output bus 6, and the emitter each transistor 1-1 ... 1-N is connected to the first output of the corresponding emitter resistor 3-1 ... 3rd, each capacitor 4-1 ... 4-N is connected in parallel to the corresponding output resistor 3-1. ..3-N The second terminal of the first emitter resistor 3-1 is connected to the input bus 7 and through the first diode 5-1 with common fault 8, which is connected to the base of the last 1-N, the base of each previous transistor 1-1 ... 1- (N-1) is connected to the second end of the corresponding emitter resistor 3-2 ... 3rd and through the corresponding diode 5-2 ... 5-N is connected to the common bus 8.

 FIG. Figure 1 also shows the control pulse generator 9, the internal resistance 10 of the control pulse generator 9, the power supply 11 and the load 12.

Transistor key works as follows.

At time tj, (Fig. 2), a pulse of generator 9, having an unlocking polarity, during the time t (Fig. 2), the flow of the control of the nmz current between the control bus 7 and the common pin 8 along the series connected capacitors 4-1 ... 4-K and base-emitter transitions of transistors 1-1 ... 1-N. In this case, the diodes 5-1 ... 5-N are closed, the current in the collectors of the transistors 1-1 ..., .. 1-N is absent, and the capacitors are charged before the voltage U. The maximum duration tr (fig. 2) of the pulse 1g of the generator 9 is limited to 3208882

It is the diffusion time T of minority carriers to the collector junction of transistors 1-1 ... 1-N. In the bases of the transistors 1-1 ... 1-N, by the time 5 t, the charge of minority carriers Qn - t accumulates,

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time t, a current begins to flow through the collector junctions of transistors 1-1 ... 1-N, and an output pulse is measured in load 12. In this case, the collector currents of the transistors 1-1 ... 1-N are closed on a common bus 8 through the base terminals and the corresponding open diodes 5-2 ... 5-N. I- emitter junction transistors

1-1 ... 1-N are locked by the voltage of charged capacitors 4-1 ... 4-N U, an In the time period from t, (Fig. 2) collector transitions of transistors

20 1-1 ... 1-N are open. As the excess charge of minority carriers is absorbed, the collector transitions at time 13 are shifted in the opposite direction and by the time t, transistors 1-1 ... 1-N are locked. Capacitors 4-1 ... 4-N are discharged through resistors 3-1 ... 3-N, and the transistor switch returns to its original state.

30 The speed of this transistor switch is higher than that of the known transistor switches, due to the reduction of the switching transistors.

35

Claims (1)

Invention Formula A transistor switch containing N transistors, N collector resistors, And emitter resistors, an input and a common bus, a collector of each transistor is connected to an output bus through the corresponding collector resistor, and the emitter of each transistor is connected to the first end of the corresponding emitter resistor, that, in order to improve the speed, N capacitors and and diodes are introduced, each capacitor being connected in parallel to the corresponding SP emitter resistor, the second output of the first emitter resistor is connected to the input bus and through the first diode with a common bus that is connected to the base of the last transistor, the ba for each previous transistor is connected to the second end of the corresponding emitter resistor and through the corresponding diode connected to a common bus. 3208882 It is the diffusion time T of minority carriers to the collector junction of transistors 1-1 ... 1-N. In the bases of the transistors 1-1 ... 1-N, by the time 5 t, the charge of minority carriers Qn - t accumulates, AT Invention Formula A transistor switch containing N transistors, N collector resistors, And emitter resistors, an input and a common bus, the collector of each transistor is connected to the output bus through the corresponding collector resistor, and the emitter of each transistor is connected to the first end of the corresponding emitter resistor, characterized in that , in order to improve the speed, N capacitors and and diodes are introduced, each capacitor connected in parallel with the corresponding emitter resistor, the second output of the first emitter resistor is connected to the input bus and through the first diode with a common bus that is connected to the base of the last transistor, the base of each previous transistor is connected to the second output of the corresponding emitter resistor and through the corresponding diode connected to a common bus. t, t fig Z ty t4