SU1621165A1 - Transistor logic component - Google Patents

Abstract

The invention relates to a pulse technique and can be used in discrete automation systems. The purpose of the invention is to reduce power consumption. The transistor logic element contains two diodes, seven resistors, a phase-separation transistor, a composite transistor made on the first and second transistors, an output transistor, a third transistor, and an input transistor. The introduction of new connections reduces the average power consumption by eliminating the flow of end-to-end currents. 1 silt

Description

The invention relates to a pulse technique and can be used in discrete automation systems.

The aim of the invention is to reduce power consumption.

The drawing shows an electrical principle, a transistor logic element circuit.

The transistor logic element contains a phase-separation transistor 1, the collector of which is connected through the first resistor 2 to the power supply bus, the emitter to the base of the output transistor 3, the emitter of which is connected to the common bus, and the collector with the composite transistor emitter and output 4. The composite transistor includes the first 5 and The second 6 transistors connected in such a way that their collectors are combined and form a collector of a composite transistor, connected through the seventh resistor 7 to the power supply bus, the base of transistor 5 forms the base of a composite tra ican, the emitter of the transistor 5 is connected to the base of transistor 6 and transistor 6, the emitter of the emitter forms a composite transistor, the collector of the third transistor connected to the base 8

transistor 3 emitter to a common bus, and the base is connected to the terminals of the third 9 and second 10 resistors, the anode of the second diode 11, the cathode of which is connected to the second output of resistor 9 and the emitter of transistor 5, the second output of resistor 10 is connected to the common bus, the base of transistor 5 is connected to the collector of transistor 1, the base of which is connected to the emitter of the input transistor 12 and through the fourth resistor 13 to the common bus, the collector and base of the transistor 12 through the fifth 14 and sixth 15 resistors are connected to the power bus, the base of the transistor 12 of the diode 16, the cathode of which is connected to the input 17.

Transistor logic element works as follows

Let the input voltage 17 be low, then the transistors 1,12,3 are closed because there is no current in the base circuits of these transistors. The output 4 will be set to a high voltage level, defined by the open transistors 5 and 6 of the composite transistor. Transistor 8 is open, as its base transmits to

with

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A high level through a resistive divider formed by resistors 9 and 10. When the input voltage changes from low to high, diode 16 is locked and the base of transistor 12 receives current from power bus 5 through resistor 15. Transistor 12 opens and flows into its collector circuit the current detected by the resistor 14 and entering the base of the transistor 1. Transistor 1 opens, a current defined by resistor 2 flows through its collector 10 circuit, which through the collector - emitter circuit of the open transistor 8 flows into a common bus and potential on the collector of transistor 1 is reduced. The collector-emitter circuit of transistor 8 shunts the base-emitter junction of output transistor 3 and it continues to remain closed. Thus, there is a reduction in potential based on the composite transistor 20 and, accordingly, a decrease in the high voltage level at the output of the circuit when the output transistor is turned off. The resistive divider transmits a voltage drop from the base of the composite transistor 25 to the base of the transistor 8 and it starts to turn off. The emitter current of transistor 1 begins to flow into the base of the output transistor 3, and transistor 3 opens. Consequently, the establishment of a low voltage circuit at the output 30 occurs when the composite transistor is already disconnected, and thus the through current when output 4 goes from a high to a low state is eliminated.

When the input signal goes from high to low, diode 16 is opened, transistors 12 and 1 are closed.

An increase in the potential at the collector 40 of transistor 1 to the magnitude of two base-emitter junctions leads to a surge of current into the base of transistor 8 through the capacitance of the reverse-biased diode 11 closed at the first moment of time. Transistor 8 opens and a sharp decrease in potential occurs at the emitter of transistor 1 . Since the voltage at the base of transistor 1 changes slowly because of the high resistance resistor 13, a short-time additional opening of transistor 1 occurs due to the discharge of its diffusion capacitance through the emitter junction and, therefore, the potential increase at the collector transistor 1.55

This is a slowdown in the rise of potential on the basis of a composite transistor and the presence of a low-impedance collector-emitter circuit of transistor 8 for switching off the output-. Transistor 3 provides elimination of the through current when the output of the circuit goes from low to high. Resistor 7 is needed to limit the current during a short circuit at the output of the circuit. Thus, the proposed technical solution allows to eliminate the through current when the element is switched, i.e. the average power consumed by the circuit is reduced, as well as the speed increase from low to high

Claims (1)

Invention Formula A transistor logic element containing two diodes, a phase separation transistor, the collector of which is connected through the first resistor to the power supply bus and the base transistor, which includes the first and second transistors, the collectors of which are combined and form the collector of the composite transistor, the base of the first transistor forms the base of the composite transistor , the emitter of the first transistor is connected to the base of the second transistor, and the emitter of the second transistor forms the emitter of the composite transistor, which is connected to The output transistor and collector, the emitter of which is connected to the common bus, and the base to the emitter of the phase separation transistor and the collector of the third transistor, the emitter of which is connected to the common bus, and the base through the second resistor connected to the common bus, connects the first transistor to the first output of the third resistor-, the base of the phase-separation transistor is connected to the emitter of the input transistor and through the fourth resistor to the common bus, the collector and the base of the input transistor, respectively, through the fifth and sixth pe stories are connected to the power bus input transistor base is connected to the anode of the first diode of which cathode is connected to an input of NAND gate, the transistor collector through a seventh composite resistor connected to the power bus, characterized soup d- that. in order to reduce power consumption, the second terminal of the third resistor is connected to the base of the third transistor and the Y anode of the second diode, the cathode of which is connected to the first terminal of the third resistor. "U /four 77 /five o-KF U with ABOUT #