SU1223359A1 - Multithreshold logic element - Google Patents

Abstract

The invention relates to automation and calculator technology. The purpose of the invention is to enhance the functionality and improve reliability. The device contains for each input keys on transistors 1 and 2 h -p-fi- and php-conductivity, resistors 3 and weight resistor 4. Resistive divider resistors 5. Multi-threshold discriminator 9, consisting of two input logic elements AND-NOT 10, has a threshold T of 1. The thresholds of the subsequent discriminators increase by one. The number of single-threshold discriminators in the element is equal to the number of weight resistors –4.1 sludge. (L with f2 N9 tNP 00 ca. ate; o

Description

The invention relates to automation and computing, in particular to threshold logic elements.

The purpose of the invention is to enhance functionality and increase reliability.

Introducing a change in the structure of a multithreshold logic element will reduce by half the number of resistors that determine the weights of the inputs.

The drawing shows a schematic diagram of a multithreshold logic element.

The multithreshold logic element for each input contains keys on transistors 1 and 2 hph and p-conductivity, resistors 3 and for each pair of inputs a weight resistor 4. The collectors of m-ph transistors 1 of each pair of inputs are connected and connected through resistors 4 to the output of the resistive divider on the resistors 5, the input of which is connected to the positive pole 6 of the power supply. The emitters of pp-h-transistors 1 of each pair of input are connected to emitters of p-h-p transistors 2, the collectors of which are connected to the negative pole 7 of the power supply. The bases of the second and the first pnp transistors 1 are connected to the bases of the first and second pn transistors 2 respectively and connected through resistors 4 to the input terminals 8 of a multi-threshold logic element. The multi-priced discriminator 9 consists of two-input logical elements AND-NOT 10, which form single-threshold discriminators. The input t1 of the threshold element IS-NOT is connected to the positive pole of the power source, and the output 12 is the output of the multithreshold logic element (the power source is not shown in the drawing). A single-threshold discriminator on the element AND-HE 10, one of the inputs of which is connected to terminal 11, has a threshold of operation T, 1. The trigger thresholds of subsequent discriminators increase by one compared with each previous one. The number of single threshold discrimination: the tori in the element must be equal to the number of weight resistors 4.

1223359

Multithreshold logical element works as follows.

Let the number of inputs of an element be eight. In this case, it contains four single-threshold discriminators with thresholds of srabatshan, T

ten

thirty

2,. If the input signals of the element are logic zero, then all h-p-h transistors 1 are closed, the potentials of the junction points of the resistors 5 are equal to the voltage of the power source. At the exit of the single-threshold discriminator with the smallest threshold, there is a

15 level logical zero. At the output 12 of a multithreshold logic element there is a level of logical units.

Let the value of a variable equal to one be supplied to one of the inputs of a multithreshold logic element, and to the remaining inputs the values of the variables equal to zero. In this case, the i-p-h transistor 1 and pn-p25 transistor 2, the bases of which through a resistor 3 are connected to terminal 8, to which the unit value is supplied. variable will be in the open and closed states respectively. All other i-p-h transistors 1 are closed, and p-to p-transistors / ry 2 oTKpbiTfci. Through a circuit of resistors i 3 and a resistor 4, included in the circuit of series-connected open h-p-n and p-h-p transistors 1 and 2, a current flows reducing the potential at the connection points of the resistors 5. This causes the discriminator to trigger with a threshold T 1.

40 all other discriminators, St. with a resistive divider, there is a high voltage level. The output of the discriminator with a threshold T is set to a single value of the logic function, and the output 12 of the multithreshold logic element of parity is zero.

If the terminals 8 belonging to different pairs of inputs of a multi-core logic element receive single values of logic variables, then for each pair of inputs having a single and zero value of the input variables, there is a circuit

55 of the series-connected open and -r-c and p-and-p-transistors 1 and 2. In this case, through a circuit of resistors 5 and resistors 4, included in the circuit

35

Let the number of inputs of an element be eight. In this case, it contains four single-threshold discriminators with thresholds of srabatshan, T

2,. If the input signals of the element are logic zero, then all h-p-h transistors 1 are closed, the potentials of the junction points of the resistors 5 are equal to the voltage of the power source. At the exit of the single-threshold discriminator with the smallest threshold, there is a

logical level zero. At the output 12 of a multithreshold logic element there is a level of logical units.

Let one of the inputs of a multithreshold logic element receive the value of a variable equal to one, and to the other inputs the values of the variables equal to zero. In this case, the ip-h transistor 1 and pn-transistor 2, the bases of which through the resistor 3 are connected to terminal 8, to which the unit value of the variable arrives, will be in the open and closed states, respectively. All other i-p-h transistors 1 are closed, and p-to p-transistors 2 oTKpbiTfci. Through a circuit of resistors i 3 and a resistor 4, included in the circuit of series-connected open h-p-n and p-h-p transistors 1 and 2, a current flows reducing the potential at the connection points of the resistors 5. This causes the discriminator to trigger with a threshold T 1.

all other discriminators, St. with a resistive divider, there is a high voltage level. The output of the discriminator with a threshold T is set to a single value of the logic function, and the output 12 of the multithreshold logic element of parity is set to zero.

If the terminals 8 belonging to different pairs of inputs of a multithreshold logic element receive single values of logic variables, then for each pair of inputs having a single and zero value of input variables, there is a circuit

of the series-connected open and -r-c and p-and-p-transistors 1 and 2. In this case, through a circuit of resistors 5 and resistors 4, included in the circuit

3

collectors of open hph transistors 1, a current flows, determined by the number of units received at the inputs of a multithreshold logic element. The voltages on the outputs of the resistive divider from resistors 5 decrease, which leads to the activation of discriminators on AND-HE elements 10. AND-NOT 10 in this case is equal to the number of unit values of the variables received at the inputs of the multithreshold logic element of parity. If an odd number of variables are supplied to the inputs of a multithreshold parity logic element, then an odd number of discriminators is triggered, and output 12 is set to a low voltage level corresponding to a logical zero. With an even number of single input variables, an even number of discriminators is triggered, and output 12 sets a high voltage level corresponding to a single value of the logic function.

In the case when the unit values of the variables enter the terminals 8 belonging to one pair of inputs of a multithreshold logic element, both pn-p-transistors 2 of this pair of inputs of a multithreshold logic 40

the element is closed, the current through the emitter of the hpn transistor, the emitter

The second p-and-p transistor is connected to the emitter of the second p-p-p-transis-, torus, the base of the second and first p- "rp-transistors are connected respectively to the bases of the first and second i-p-p-transistors and through the first and second resistors are connected to the corresponding input terminals of the multithreshold logic element, the collectors of the first and second nn-transistors of each pair of inputs are combined and connected to the second output of the weighting corresponding resistor, the first outputs of which are connected to the first input of the logical element and NOT, having of the lowest threshold.

resistor 4 is absent, and the output function of the element is determined by combinations of variables on other inputs. For example, three variables equal to one are fed to the inputs of a multithreshold logic parity element, and two units are supplied to terminals 8 that relate to one pair of element inputs. Consequently, the current through the resistor A related to this pair of inputs is absent and the output function of the multithreshold logic element of parity is zero, since the current through the resistors 5 is determined by only one pair of series-connected 45

VINILI Order 1723/58 Circulation 816 Subscription Branch PPP Patent, Uzhgorod, ul. Project, 4

Indoor np-h and p-h-p-transistors 1 and 2.

Claims (1)

Invention Formula A multithreshold logic element containing a resistive divider, the input of which is connected to the positive pole of the power source, the outputs are connected to one inputs of logical elements AND –NE, the second discriminator, the second input of each of which except the one having the smallest threshold, is connected with the output of the next logical element IS-NOT, ir-h-transistors and weight resistors, the first outputs of which are connected to the second input of an INE logic element having the smallest trigger threshold n with the positive pole of the power source, the output of the NAND logic element having the highest trigger threshold is the output of the device, which is intended to extending functionality and increasing reliability, it additionally contains for each pair of inputs two resistors and two The p-h-p transistors, whose connectors are connected to the negative pole of the power source, the emitter of the first p-h-p transistor is connected to