SU1575307A1 - Multithreshold logic member - Google Patents

Abstract

This invention relates to automation and computing. The aim of the invention is to increase the number of functions implemented by the multithreshold logic element. The device contains a linear adder 1, consisting of input diodes 2, separation diodes 3, resistors 4, determining the weights of the inputs of a multithreshold logic element, a multithreshold discriminator 6 made on AND-NE 7 logic elements, a resistive divider on resistors 8. To achieve the set targets for each single-threshold discriminator, with the exception of the discriminator with the highest threshold, introduced three resistors 13, 14, 15, three transistors 9, 10, 11, and new functional connections. 1 il.

Description

one

(21) 4487403 / 24-21

(22) 09/28/88

(46) 06/30/90. Bul G 24

(71) Omsk Polytechnic Institute

(72) I.A.Palnov

(53) 621.374 (088.8)

(56) USSR author's certificate

No. 1262722, cl. H 03 K 19/096, 1986.

Author's certificate of the USSR No. 573883, cl. H 03 K 19/38, 1977.

USSR Author's Certificate No. 538490, cl. H 03 K 19/12, 1977.

(54) MULTI-THROUGH LOGICAL ELEMENT

(57) The invention relates to automation and computing. Purpose

The invention is an increase in the number of functions implemented by a multithreshold logic element. The device contains a linear adder 1, consisting of input diodes 2, separation diodes 3, resistors 4, determining the weights of the inputs of a multithreshold logic element, a multithreshold discriminator 6 made on AND-NE 7 logic elements, a resistive divider on resistors 8. To achieve the set The targets for each single-threshold discriminator, with the exception of the discriminator with the highest response threshold, are three resistors 13, 14, 15, three transistors 9, 10, 11, and new functional connections. 1 il.

with SS

(L

This invention relates to automation and computing.

The purpose of the invention is to increase the number of functions implemented by the multithreshold logic element.

The drawing shows a diagram of the device.

The multithreshold logic element contains a linear sum torus 1, consisting of input diodes 2, separation diodes 3, resistor 4, determining the weights of the inputs of a multithreshold logic element connected to the positive pole 5 of the power supply, multi-threshold discriminator 6 of one-series discriminator connected in series on I-NE 7 gates, the first inputs of which are connected to the outputs of a resistive divider of resistors 8, which determine the response thresholds. The emitters of the first 9, second 10 and third 11 transistors are connected to the negative pole 12 of the power supply. The base of the first transistor 9 is connected through the first resistor 13 to the second input of the discriminator on the NAND gate 7 and to the output of the discriminator with the closest high threshold. The collectors of the first 9 and second transistors 10 are connected to the base of the third transistor 11 and through the third resistor 14 to the positive pole of the power source. The base of the second transistor 10 through the second resistor 15 is connected

ate 1 Јl

with

to the auxiliary input of the discriminator and to terminal 16 of the control of the operation of the discriminator. The second input of the NAND 7 element of the single-threshold discriminator with the highest Trigger threshold is connected to terminal 16 for controlling the operation of this discriminator. The inputs 17 receive the input variables, and the output 18 produces the result of the implementation of the switching function by a multi-threshold logic element. The power source is not shown.

Multithreshold logical element works as follows.

ten

The weights of the inputs are equal to one. Rapids

T1

T

triggers T 1,,,

.., A - n. For definiteness, suppose that the number of inputs is eight, and paragraph 8. Before starting work, a binary code is applied to terminals 16 that specifies the number and size of the element thresholds. In this case, the unit sign is 15753074

The power supply through transistors 4 and open diodes 2 enters the output circuits of the input variable signal sources. The potentials on the –output of the resistive divider are not enough to trigger the discriminators on the logs of the AND-HERE elements 7. At the output 18 of the multithreshold logic element, the level of the logical unit is formed. If only one input variable is equal to one, then only one discriminator is triggered on the NAND 7 element with the threshold T, 1 (the discriminator whose output is connected to the output 18) and a logic zero level is generated at the output of the multithreshold logic element. When two input variables with single values arrive, the corresponding diodes 2 of the linear adder close and the current through the resistors 4 and the open diodes 3 comes through the resistors 8 to the negative pole 12 of the source

20

high discriminators with thresholds T 1,

variable variable fed to terminal

4 / - ka nutrition. Work one-way 16, permits the work of the corresponding m v

the discriminator on the NAND 7 element, since the transistors 10 and 11 associated with it are in the open and closed states, respectively. The output signal of the element AND NOT 7 post 30

T2 2.

At the output of the single-threshold discriminator with a threshold of T2 2, a low voltage level is set. This leads to the appearance of the level of a logical unit at the output of the discriminator with a threshold of operation T 1 and at the output 18 of forming the output function. i

sings to the input of the discriminator with a lower threshold and to the base of the corresponding transistor 9. If the control variable has a zero value applied to terminal 16, then the corresponding multithreshold discriminator on the AND-NE element 7 is excluded from the multithreshold discriminator structure, since the output transistor of the AND-HE element 7 closes. The corresponding transistor 10 also closes, thereby ensuring the transmission of information from the discriminator output with the nearest high threshold to the discriminator input with the nearest lower threshold relative to the excluded discriminator. In this case, the information is transmitted without inversion, since it passes through two transistors 9 and 11, connected in accordance with a common emitter circuit. Let single values of variables be supplied to all terminals 16. In this case, the element has eight trigger thresholds: T0 8.

T, - 1, T5

2,

..., ig

If all input variables fed to terminals 17 are equal to zero, then the current from the positive pole 5 is source discriminators with thresholds T 1,

 m v

T2 2.

At the output of the single-threshold discriminator with a threshold of T2 2, a low voltage level is set. This leads to the appearance of the level of a logical unit at the output of the discriminator with a threshold of operation T 1 and at the output 18 of forming the output function. i

The multithreshold logic element works in a similar way on other sets of input variables, realizing the switching function

f (x ",

x

© x2 ©

® x.

Consider the implementation of another switching function. Let the control code be set as follows 10000001. In this case, the multithreshold logic element has two thresholds.

Tf

1, T2 8.

0

five

Show it. If the input set contains only zeros or only one unit, then the element works in the same way as in the previous case. If the number of units in the input set is from two to seven, then the input function of the multithreshold logic element is zero because a logical unit is formed at the output of the discriminator with a threshold T-8, which through open pairs of transistors 9, 11 associated with threshold thresholds

triggers T 2, Te 3,

1j - 7, is fed to the discriminator input with a trigger threshold T 1, since the remaining inputs of this discriminator also contain levels of logical units, then its output (and output 18) contains a logic zero level If all input variables of a multi-threshold, logical element are unit, then all diodes 2 of the linear adder are closed and the current from the positive pole 5 of the power source through all the resistors A flows through the resistor

l (.Xjt xg) X X X XdHdX HuX V X4X2XjX X5XgX-, Xg.

By setting other code values at terminals 16, it is possible to vary within large limits the number and magnitudes of the thresholds of a multi-threshold logic element. To increase the weights of the inputs, several terminals 17 can be combined and the corresponding input variable fed into them.

Claims (1)

Invention Formula A multithreshold logic element containing a linear adder consisting of input diodes and a resistor array, the outputs of which are connected through the corresponding separating diodes to the input of a resistive divider, the outputs of which are connected to the corresponding first inputs of an AND-collector with a multi-threshold discriminator, the second the input of each of which, except for the NAND element with the highest triggering threshold l is connected to the output of the subsequent NAND logic element, the output of the I - element E with the lowest threshold is output apparatus, wherein for the purpose chto8 a divider of resistors 8 to the negative pole 12 of the power supply. EP this case is the output potential of the re-. A cyst splitter 8 becomes sufficient to trigger a single-cost discriminator with a threshold of Td 8. A low voltage level is set at its output, which is transmitted to the discriminator input with a response threshold T ,, 1 ". This leads to a high voltage level at the output 18 of the formation logical function From the above example, it follows that the multithreshold logic element implements the function: five increasing the number of implemented switching functions, for each single-threshold discriminator on the NAND element, with the exception of the discriminator with the highest response threshold, three resistors and three transistors emitters of which are connected to the negative pole of the power source are additionally added, the base of the first transistor is connected to the output through the first resistor of the AND-NO discriminator with the nearest high threshold s The base of the second transistor is connected via a second resistor to the auxiliary input of its NAND element and to the corresponding control terminal of the discriminator, the collectors of the first and second transistors are connected to the base of the third transistor and through the third resistor to the positive pole of the power source, the collector of the third transistor is connected to the output of its AND-NOT element the second input of the AND element -NOT single threshold 5 of the discriminator with the highest threshold is connected to the control terminal of the operation of this discriminator. with "# 0