RU2732444C1 - Analogue-to-digital converter for measuring oscillations - Google Patents

Abstract

FIELD: digital equipment.

SUBSTANCE: invention relates to digital engineering, particularly to devices for converting analogue voltage to digital code. Said result is achieved due to that analogue-to-digital converter for oscillation measurement consists of five switches, differential amplifier with gain factor 2, comparator, direct current amplifier with amplification factor, inverter, two analogue storage devices, control device, serial to parallel converter, counter by module M, cascode differential operational amplifier and device for measurement of maximum value of pulsed analogue signal.

EFFECT: amplification of useful signal, elimination of additive noise recording, faster operation.

1 cl, 1 dwg

Description

The invention relates to the field of digital technology, in particular to devices for converting analog voltage into a digital code.

An analog-to-digital converter is known for its similar practical use, the principle of operation of which is based on the use of an additional narrow-range analog-to-digital converter, to the input of which a converted voltage is supplied, which improves the accuracy of this device [1].

The disadvantages of these devices are the large influence of additive noise and relatively low performance.

The closest in technical essence is an analog-to-digital converter [2], the principle of operation of which is based on increasing the bit depth of the analog-to-digital conversion while maintaining a given speed and simplifying its architecture.

The use of such devices is limited by the lack of the possibility of maximizing the signal amplification and the possibility of registering additive interference, which manifests itself in the form of local extrema.

The objective of the invention is to create a technical solution alternative to the known solution, additionally using a cascode differential operational amplifier [3] and a device for measuring the maximum value of a pulsed analog signal [4] in the circuit, which makes it possible to amplify the useful signal, exclude the possibility of registering additive noise, which manifests itself in the form of local extrema and increase performance.

The required technical result is achieved by the fact that the proposed device contains five keys, a differential amplifier with a gain of 2, a comparator, a DC amplifier with a gain, an inverter, 2 analog memory devices, a control device, a serial-to-parallel code converter, a counter modulo M, a cascode differential operational amplifier and a device for measuring the maximum value of a pulsed analog signal.

The essence of the invention is illustrated by a drawing, where FIG. 1 shows a possible variant of constructing an analog-to-digital converter for measuring oscillations, which contains:

1 key;

2 - key;

3 - key;

4 - key;

5 - key;

6 - differential amplifier with a gain of 2;

7 - comparator;

8 - constant current amplifier with a gain;

9 - inverter;

10 - analog storage device;

11 - analog storage device;

12 - control device;

13 - serial-to-parallel code converter;

14 - counter modulo M;

15 - cascode differential operational amplifier;

16 - device for measuring the maximum value of the pulse analog signal;

An analog-to-digital converter for measuring oscillations works as follows: in the initial state, the control device (12) does not work, the potentials at its outputs are unchanged, and they are equal to unity at the first and third outputs, and zero at the second. Under the influence of these potentials, the third (3) and fifth (5) keys will be permanently closed (open), and the fourth key (4) will be open (closed). The input analog signal is fed to the input of the counter modulo M (14) and the first analog memory (10), in which it is stored, and to the direct inputs of a differential amplifier with a gain of 2 (6) and a comparator (7), in which a comparison is made voltage of this signal with a reference voltage U0; the value of the latter is chosen equal to the price of the most significant bit (for example, half of the maximum value of the input voltage). If the voltage at the input exceeds U0, a logical (log) 1 appears at the output of the comparator (7), which will open key 1 and (through the inverter (9)) close key 2; thus, the reference voltage U0 will be applied to the inverting input of a differential amplifier with a gain of 2 (6). If the voltage at the input is less than U0, a log 0 appears at the output of the comparator (7), which will close key 1 and open key 2: in this case, a voltage equal to 0 will be applied to the inverting input of a differential amplifier with a gain of 2 (6) Thus, the value of the first (most significant) bit of the output code will appear at the output of the comparator (7), and a differential amplifier with a gain of 2 will subtract the voltage supplied to its inverse input (U0 or 0) from the input and double the voltage difference by direct and inverse input; in any case, this difference in magnitude will be less than the discharge price (in the limiting case, it is equal). The output voltage of a differential amplifier with a gain of 2 (6) is fed through an open key (5) to the input of a second analog memory device (11), where it is stored and fed to the input of a DC amplifier with a gain of 2 (8), then it is fed to the input of the cascode differential operational amplifier (15), where the useful signal is maximally amplified, the output of the DC amplifier with a gain of 2 (8) is connected in series with the input of the cascode differential operational amplifier (15), the output of the cascode differential operational amplifier (15) is connected in series with the input devices for measuring the maximum value of the pulsed analog signal (16), then the voltage is fed to the input of the device for measuring the maximum value of the pulsed analog signal (16), after which the possibility of registering additive noise manifested in the form of local extrema is excluded, the output of the device for measuring Measurement of the maximum value of the pulse analog signal (16) is connected to the input of the key (4), then through the key (4) and the comparator (7) it is fed to the input of the serial-to-parallel code converter (13).

SOURCES OF INFORMATION

1.Ru 2168269, 2001

2.Ru 2245000, 2005

3.Ru 2640744, 2016

4.Ru 2063048, 1996

Claims (1)

An analog-to-digital converter for measuring oscillations, consisting of five switches (blocks 1-5), a differential amplifier with a gain of 2 (block 6), a comparator (block 7), a DC amplifier with a gain of 2 (block 8), an inverter ( block 9), two analog memory devices (block 10, block 11), control devices (block 12), a serial-to-parallel code converter (block 13), a counter modulo M (block 14), characterized in that it additionally contains cascode differential operational amplifier (block 15) and a device for measuring the maximum value of a pulsed analog signal (block 16), and the output of the DC amplifier with a gain of 2 (block 8) is connected in series with the input of the cascode differential operational amplifier (block 15), the output of the cascode differential operational amplifier (block 15) is connected in series with the input of the device for measuring the maximum value of the pulse a tax signal (block 16), in turn, the output of the device for measuring the maximum value of the pulse analog signal (block 16) is connected to the input of the key 4 (block 4).

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