SU1531209A1 - Integrated element - Google Patents

Abstract

The invention relates to a pulse technique and can be used in the construction of ECL-type microcircuits. The purpose of the invention is to increase the reliability of the integral ECL element by simplifying. The integrated ECL element contains four transistors, four diodes and five resistors. The fourth transistor branches a portion of the input current into the reference voltage shaping circuit at the base of one transistor and simultaneously limits the voltage level at the base of the other transistor, which together form the ECL element. This results in a simplification of the ECL element without reducing the speed and increasing the power consumption. 1 il.

Description

The invention relates to a pulse technique and can be used in the construction of ESP-type microcircuits.

The aim of the invention is to increase reliability by simplifying.

The drawing shows a circuit diagram of an integrated ECL element,

The integrated ECL element contains the first 1 and second 2 resistors connected by the first leads to the power supply bus 3, and the second to the collectors of the first 4 and second 5 transistors and to the first 6 and second 7 outputs, the emitters of the transistors 4 and 5 are connected to the collector of the third transistor 8, the emitter of which is connected through the third resistor 9 to the common bus 10, the base of the transistor 4 through the fourth resistor 11 is connected to the power bus 3 and to the anode of the first diode 12,

whose cathode is input 13, the base of the transistor 5 is connected via the fifth resistor 14 to the supply bus 3 and to the anode of the second diode 15, the cathode of which through the third 16 and fourth 17 diodes connected in series to the common bus 10, the base of transistor 4 is connected to the collector Fourth ... of the transistor 18, the base of which is connected to the collector of transistor 8, and the emitter - to the base of transistor 4 and to the cathode of the diode 15.

The integral ECL element works in the following way.

When the input to the input 13 of the high voltage level, the current through the diode 12 is stopped and through the resistor 11 flows into the base of the transistor 4.

When transistor 4 is opened, transistor 5 is closed. The current through the transistor 4 is determined by the general government

with

to

about with

rum current, performed on the transistor 8 and the resistor 9. The voltage at the base of the transistor 8 is constant and equal to, where Ug is the direct drop in the voltage across the base-to-emitter junction, while the generator current will be equal to

one

which makes it easy to calculate the value of resistors 1 and 2 to obtain a given voltage drop across the outputs 6 and 7.

When the voltage U is reached on the base of transistor 4, transistor 18 opens and excess part of the base current of transistor A along the circuit: power supply bus 3, resistor 11, collector emitter of transistor 18, diodes 16 and 17, fault 10, flows through based on traizistor 5.

In this case, the voltage on the base of the transistor 4 does not exceed the level of 4U, which prevents saturation of the transistor 4 at a given value of the logical voltage drop and output 6. The input current component used to form the reference voltage on the base of the transistor 5 is redundant the base current of the transistor 4, which can be selected from the base circuit of this transistor after it is turned on.

When a low level voltage is applied to the input 13, the transistor 5 opens and the transistors 4 and 18 are closed, as the input current flows with an egan in the circuit: a wide 3 power supply, a resistor 11, a diode 12, an input 13.

g

0

5 5

0

0

The voltage at the base of transistor 5 is constant and equal to 3Ug due to the flow of current through the circuit: power supply bus 3, resistor 14, diodes 15-17, common bus 10.

Claims (1)

Thus, the ECL element contains a smaller number of elements and provides for speed and power consumption not worse than the known technical solution, which allows improving the technical and economic performance of devices made on its basis. Invention Formula An integral ECL element containing the first and second transistors, the collectors of which are respectively connected to the first second outputs and, respectively, through the first and second resistors are connected to the power bus, and the emitters are connected to the collector of the third transistor, the emitter of which is connected through a third bus to the common bus, the base of the first transistor through the fourth resistor is connected to the power supply bus and connected to the anode of the first diode, the cathode of which is connected to the input, the base of the second transistor is connected to the bus across power supply and with the anode of the second diode, the cathode of which is connected through a series of third and fourth diodes to a common bus, about the same and with the fact that, in order to increase reliability, a fourth transistor is inserted, the collector of which with the base of the first transistor, the base with the collector of the third transistor, and the emitter with the base of the third transistor and from the cathode of the second diode.