SU1045391A1 - Current selector switch - Google Patents

Abstract

CURRENT SWITCH, containing | two bipolar transistors of the same conductivity type ,. KOTO1ZH1X emitters are connected to the first DC source, the second and third DC sources to which transHCTOpOjj collectors are connected, two control signal sources to which the transistor bases are connected, the first Schottky diode connected between the collectors of transistors, and a constant voltage source so that, in order to increase the speed, the second, third and fourth Schottky diodes are introduced, the second Schottky diode being connected opposite to the first Schottky diode, and the third and fourth The Schottky diodes are connected in the forward direction, the scientific research institutes between the DC bus and the transistor collectors. with (O (L N 01 with her

Description

The invention relates to a pulse technique and can be used with logic elements, switches, triggers, forming and coding devices, and analog-to-digital converters.

A current switch is known, built on bipolar transistors with resistors in a collector circuit x 1.

However, in this device, the dynamic capabilities of the transistors are used inefficiently. . ,

The closest in technical essence to the present invention is a current switch comprising two bipolar transistors of one type of conductivity, the emitters of which are connected to the first direct current source, the second and third direct current sources to which the collectors of transistors are connected, two source control signals, which are connected to the base of the transistors, the first diode Schottky, connected between the collectors of transistors, and the source of constant voltage. This device ensures the rapid formation of a voltage drop across the collector of the activated transistor 2.

However, the voltage drop across the collector of the switched on transistor is formed slowly, which reduces the speed of the current switch.

The invention of the invention is an increase in speed.

. The goal is achieved by the fact that a current switch containing two bipolar transistors of the same conductivity type; the emitters of which are connected to the first source of direct current, the second and third sources of direct current, to which the collectors of transistors are connected, two sources of control signals with which the bases of transistors are connected, the first diode of Schottky,

. connected between the collectors of transistors, and a source of constant voltage, introduced the second, third and fourth Schottky diodes, the second Schottky diode switched on counter-parallel to the first Schottky diode and the third and fourth Schottky diodes included in the forward direction between the bus voltage source and collectors of transistors. The drawing shows a circuit diagram of the device.

The current switch contains transistors 1 and 2, the emitters of which are connected to the first DC source 3, sources 4 and 5 of the control signals to which the bases of transistors 1 and 2 are connected,

the second and third sources 6 and 7 of direct current, to which collectors of transistors 1, 2 and four Schottky diodes 8-11 are connected. -Diode 8 is connected between collectors of transistors 1 and 2, diode 9 is connected anti-parallel to diode 8.,., and diodes 10 and 11 are connected in the forward direction between the bus | 12 voltage source and the collectors of transistors 1 and 2. All voltage and current sources are connected to the zero potential bus 13, and the output signals of the current switch are formed at nodes 14 and 15 .

The device works as follows.

The collectors of transistors 1 and 2 are connected via a Schottky diode 10 and 11 to a DC 12 voltage source. All sources of voltage and current in the device are connected to the zero potential bus 13. The output signals of the current switch are formed in the nodes 14 and 15. Schottky diodes 8 and 9 are parallel and opposite in between the collectors of the transistors. The collector circuits of the transistors 1 and 2 feed the DC sources 6 and 7.

Let in the initial state the potential of the base of the transistor 1, fixed by the source 4, is noticeably (0.4-0.7 V) lower than the base potential of the transistor 2, fixed by the source 5. Therefore, the transistor 1 is closed, and the current of the source 3 is taken from emitter circuit of transistor 2

In this state, diode 11 is biased in the forward direction by the collector current of transistor 1, diode 9 is open by the source of current b, diodes 10 and 8 are closed, the collector potential of transistor 1. is close to the potential of the bus 12. To provide such a switch mode, , the sum of the direct currents generated by sources b and 7 was less than the direct current generated by source 3.

In dynamics, the level of the signal generated by source 4 increases, and the level of the signal generated by source 5 decreases. As a result, transistor 2 is closed, and the currents of source 3 are switched into the emitter circuit of the opening transistor 1. The collector current of transistor 2 drops sharply, and with it decreases the conduction current of diode 11, the accelerated switching off of diodes 11 and

9 is provided with a current source 7. The collector current of the enable transistor 1 forces the diode 10 to turn on. The diode 8 is turned on by the current of the source 7.

The next switching of the current generated by the source 3 into the emitter circuit of transistor 2 is achieved by reducing the potential of the base of transistor 1 relative to the potential of the base of transistor 2. The sharply increasing collector current of transistor 2 includes diodes 11 and 9. The acceleration of the diode 9 enables | its turn, the current source 6 provides a quick turn off of the diodes 10 and 8.

Thus, the organization of electrical connections in the collector circuits of transistors 1 and 2 provides a forced turn off of diode 10 {when turning off transistor 1 and forced turning off diode 11 (when turning off transistor 2), therefore, the processes of turning off dyuses 10 and 11 are short-lived. This ensures the rapid formation of the voltage drop across the collectors of the off transistors 1, 2 and, accordingly, increases the speed of the current switch.

Claims (1)

CURRENT SWITCH Two two bipolar transistors of the same type of conductivity,. emitters of which are connected to the first source of direct current, second and third sources of direct current, through which the collectors of transistors are connected, two sources of control signals, to which the bases of transistors are connected, the first Schottky diode connected between the collectors of transistors, and the source of constant voltage, oh cg In order to increase the speed, the second, third and fourth Schottky diodes are introduced, with the second Schottky diode connected counter-parallel to the first Schottky diode, and the third and fourth Schottky diodes are connected in the forward direction, between the bus of the DC voltage source and the collectors of transistors. about SU. „1045391