SU601827A1 - Logical threshold element - Google Patents

Description

The invention relates to automation and to computing.

Known threshold logic elements having an input adder, the output of which through an amplifier is connected to the earthquake element l.

However, narrow functionality and low reliability are typical for these threshold logic elements.

Also known threshold logic element having a linear adder, the output of which is connected to the input of the discriminator 2., IS

The purpose of the invention is to enhance the functionality of increasing the reliability of the element.

To do this, in a threshold logic element having a linear adder, the output of which is connected to the input of the discriminator, the discriminator is made on a transitional phototransistor optically coupled. 25

with LED, the anode and cathode of which is connected to the auxiliary input of the device.

The drawing shows an example of a threshold logic element.

The threshold logic element contains a linear adder on resistors 1-5 and diodes 6-15, a discriminator on a single junction phototransistor 16, resistors 1719 and a capacitor 2O, an LED 21 whose poles (anode and cathode) are connected to the terminals of an additional input 22. The element is connected to the positive 23 n negative 24 poles of a DC power source. The control signals are fed to inputs 25-29, and the value of the output signal is taken from the output of the AC.

The device works as follows.

Claims (2)

In the absence of a control signal at the auxiliary input 22, the light signal is not transmitted via an optical connection between the LED 21 and the single-transition phototransistor 16. The threshold logic element implements the threshold function tvM, x, iT,) F 1 El tw-x- T) F 0, where p is a function, implemented by the element; W.- the weight of the input element i. X value of the input signal t (X -rjol i- - 1 П1 is the number of element inputs, T is the element threshold value. The discriminator's response threshold is determined by the resistor value 19. When the threshold is reached}, the element triggers. in the relaxadio mode, the frequency of which is determined by the total value of resistors 1-5 and the capacitance of the capacitor 20, the amplitude of the output impulses taken from the output 30, is choked by resistors 17, 18. zi o the single transition LED of the single junction to the phototransistor 16 transmits the light of the voltage changing volt — ampere characteristic of the single junction phototransistor / a. The element changes the threshold to work. A new M} value, the threshold values are determined by 3 3 .- where T is the value depending on the current value Formula of the invention Threshold logic element having a linear adder, the output of which is connected to the discriminator input, characterized in that it has a reliable extension the discriminator is made on a single junction phototransistor, optically coupled to the LED, the anode and cathode of which are connected to the auxiliary input of the device. Sources of information, cited in c) Need for Expertise: 1, US Patent No. 3250517, Cl, ZO7-88. 5, 1966. 2.Ao6f onpaBOB O. E, et al. Designing circuits and nodes EVL1, pa threshold elements. LA. 1976, p. 17, fig. 1-10.