SU1026311A1 - Device for transmitting discrete signals - Google Patents

Abstract

A DEVICE FOR TRANSFER OF DISCRETE SIGNALS, containing a transistor-transistor logic element, the output of which is connected to the input of a transistor effort - - - ctg and-dctek, th {: G, SL; 0-c g I o.k,: o :, ta; - ::. I .. "1, ..-, .-, ..w-siit J bodies, for example, two-stage with a common emitter on two transistors, and a resistor, characterized in that, in order to increase the reliability of work, additional first ones are introduced into it and the second transistors, with the base of the first additional transistor connected to the collector of the second transistor of the transistor amplifier, the emitter through the resistor to the power supply terminal, the collector to the collector of the second additional transistor, the base of which is connected to the base of the second transistor of the transistor amplifier, tter - with device code.

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The invention relates to a pulse technique and can be used, for example, in amplifying installations. A known amplifier containing three transistors connected in a circuit with a common emitter, the collector of each of which is connected to the base of the previous transistor, resistors are included in the collector and emitter circuits of each transistor 1 3 The disadvantage of this device is low reliability. Closest to the proposals: there is a device for transmitting DisKpeTHbix signals, containing a transistor-transistor logic element whose output is connected to the input of a transistor amplifier, such as a two-stage amplifier. with a common emitter on two transistors, and a resistor i 2. The disadvantage of the device is also low reliability. The purpose of the invention is to increase the reliability of the device. The goal is achieved by the fact that a device for transmitting discrete signals containing a transistor-transistor logic element, the transistor of which is connected to the input of a transistor amplifier | for example, a cadre with a common emitter on two triggers: and a resistor are added to the additional first and second transistors, the base of the first additional transistor is connected to the collector of the second transistor of the transistor amplifier, the emitter through the resistor to the power supply bus, the collector to the second collector ; a. of the transistor, the base of which is connected to the base of the second transistor of the transistor amplifier, and the emitter - with the output bus. The drawing shows a structural electrical circuit of the device. The device contains a transistor CT1 transistor logic element 1, a transistor amplifier 2, for example, a double-stage with a common emitter on two t-razistor 3 and 4 and resistors S -.8, a resistor 9, additional tractors 1O and 11 (output). The device works as follows. When the output transistor of the element 1 is locked (with a free collector at the output, for example, the circuit 155La8 is known), the transistor 3 is o-traced by the base current flowing through the resistor S and goes into saturation. The small value (close to zero) of the voltage of a nastier collector-emitter of transistor 3 locks the output transistor 11 and transistor 4. The voltage across the collector of the locked transistor 4 and the base of the transistor 10 is equal to the supply voltage E, which ensures the locked transistor 10. In this logical On the outgoing bus, the device produces a voltage equal to zero - a logical zero. When the transistor of element J is small, the magnitude (close to zero) of the saturation voltage of the collector emitter of the output transistor of element 1 locks the transistor 3. Transistors 11. and 4 are unlocked by the base currents flowing through the resistor 6. The collector current of transistor 4 creates a drop in resistor 7 The voltage across the collector of transistor 4 and at the base of transistor 10 decreases, and transistor 10 opens. Through the open transistors 10 and 11, a load current flows, and a high voltage is generated at the output terminal of the device - a logical unit. If in this logical mode the output bus is short-circuited with the total device width, then the voltage on the bases of transistors 11 and 4 is equal to the voltage drop at the base-emitter junction of transistor 11, while the transistor 4 is locked, because of its emitter the voltage is zero, and when the transistor 4 switches, the transistor 11 is also locked, turning off the load current, .. Thus, the device provides for limiting the output current at any value of the output short-circuit resistance to a common power, thereby reliability of its work.

Claims (1)

A DISCRETE SIGNAL TRANSMISSION DEVICE containing a transistor-transistor logic element, the output of which is connected to the input of a transistor amplifier, for example, two-stage with a common emitter on two transistors, and a resistor, characterized in that, in order to increase the reliability of operation, an additional first and the second transistors, the base of the first additional transistor connected to the collector of the second transistor of the transistor amplifier, the emitter through a resistor to the bus of the power source, the collector to the collector of the second additional transistor whose base is connected to the base of the second transistor amplifier transistor <emitter and - an output bus of the device. SU .... 1026311> 1 1026311 2