SU720841A1 - Analog majority device - Google Patents

Description

(54) ANALOG MAJOR DEVICE

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The invention relates to the field of automation and electronics and can be used in the construction of automatic control and monitoring, creating functional converters, modeling various processes, as well as when backing up analog circuits.

Priority selection devices are known that contain a diode circuit for selecting the largest and smallest signals 2.

The disadvantage of these devices is that they do not provide sufficient accuracy, reliability, have a limited scope, are not technologically advanced in the MW design.

The closest to the technical essence of this invention is an analog majority device containing an amplifier 3.

The disadvantage of this device is that at low levels of input signals, it ceases to perform its functions, i.e. it has a restriction of sensitivities that are typical of the lower level of input signals, which significantly degrades the accuracy, iDe6efiSG

narrows the field of application of the device in control systems where the input signals

change 1 YTs from zero io wakeyalbnogo value. In addition, it has another significant drawback,

that the device is critical to the magnitude of the load and is not technologically adaptable, since it requires an individual selection of the parameters of the resistors included in it according to the characteristics of the diodes used, and also requires an additional power supply isolated from the ground.

The aim of the invention is to increase the accuracy and reliability of the device.

The goal is achieved by the fact that a switch, comparators, a decoder, keys are entered into the device, the inputs of the comparators are connected to the inputs of the KOMjrfytatbpa, and the outputs are connected to the inputs of the integrator, the outputs

the decoder is connected via keys to the control inputs of the switch, the output is connected to the input of the amplifier.

The functional scheme of the majority device is represented in the drawing.

The device contains a switch 1, amplifier-2, comparators 3-5, decoder 6, keys 7-9, sources 10-12 of input signals, inputs 13-15 of the switch, inputs 16-21 and outputs 22-24 of the comparators 3-5, inputs 25-27 and outputs 28-30 of the decoder 6, control inputs 31-33 and output 34 of switch 1, input 35 and output 36 of amplifier 2, input 37 of switch 1, input 38 of the decoder 6.

Consider the operation of the device by the example of three input signals x i о, x i, and X 12 (indexes with x denote the belonging-, Sffoetb Signals to the corresponding input or output of the device), coming through the switched inputs 13-15 to the switch 1 and through the inputs 16 -21 - to comparators 3-5, where the level of input signals is compared.

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The device has a high speed. The delay introduced by the device is defined as

 t. + t, 4-t

B K A.KF K

t c response time (k6mp arator

Where

(not more than 1 µs), td-g - time of operation of the decoder

(not more than 60);

KA - key activation time (not

more than 1 µs)

V is the switch on time (not

more than 1 µs).

Due to the use of a buffer amplifier with a unit coefficient of power, when X1 is about x 11 xi 2, the output 22 of the comparator 3 will have a high signal level, the output 23 of the comparator 4 is low and the output 24 of the comparator 5 is low. Assuming a high level of “1, low for“ Oh,

at outputs 22, 23 and 24 of the comparators 3, 4 and 5, we have the binary code “100.

The comparators 3-5 are connected to the outputs 25-27 of the decoder 6, the output 29 of the decoder 6 through the switch 8 is connected to the control input 32 of the switch 1. In the switch 1

opens a channel corresponding to the passage of the signal xi i (the average of the three input signals) fed to the input 35 of amplifier 2, the output 36 of which is

the output of the circuit from which the signal xi 1 is taken. At other ratios of the input signals, the device operates in the same way as shown in the table of the truth of the device operation.

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neither in the presence of deep negative feedback, the device has high input and very low output impedances. The output voltage copies the input voltage of the open channel of the switch and does not depend on the magnitude of the load. The sensitivity of the device is determined by the koMnapaTOpOB trigger threshold and does not exceed 1-2 mV; it is technologically easy to manufacture, since it does not require adjustment. The same way

You can implement a circuit for any odd number of input signals.

The proposed device, away from the known ones, does not have a lower limit for limiting the level of input signals; it does not require an additional isolated power source and configuration.

Claims (3)

Invention Formula An analog majority device containing an amplifier, characterized in that, in order to increase the accuracy and reliability of the device, a switch, comparators, a decoder, keys, inputs of the comparators are connected to the inputs of the switch, and outputs to the decoder inputs, decoder outputs via keys so10 J0- Dineny with the control inputs of the switch, the output of which is connected to the input of the amplifier. Sources of information taken into account during the examination 1. USSR Author's Certificate No. 190664, cl. G 06 F 11/00, 1965. 2. Gilbo, E.P., et al. Signal processing based on an ordered choice. M., “Owls. radio, 1975, p. 309, fig. 7, 9. 10 3. USSR author's certificate number 219919. cl. G 06 F 11/00, 1976 (prototype).