SU879765A1

SU879765A1 - Analogue-digital conversion method

Info

Publication number: SU879765A1
Application number: SU782476788A
Authority: SU
Inventors: Валентин Сергеевич Гутников
Original assignee: Ленинградский Ордена Ленина Политехнический Институт Им.М.И.Калинина
Priority date: 1978-04-18
Filing date: 1978-04-18
Publication date: 1981-11-07

Description

Изобретение относится к вычислительной технике и может найти применение при построении цифровых помехозащищенных вольтметров и аналого- , цифровых преобразователей.The invention relates to computer technology and can find application in the construction of digital noise-free voltmeters and analog, digital converters.

Известен способ аналого-цифрового преобразования, основанный на двухтактном интегрировании, с введением специальной весовой функции при интегрировании преобразуемого сигнала [12 ·A known method of analog-to-digital conversion, based on push-pull integration, with the introduction of a special weight function when integrating the converted signal [12 ·

Известен способ аналого-цифрового преобразования, по которому весовая функция реализуется путем умножения сигнала на изменяющийся от времени 15 коэффициент с помощью управляемого резистивного делителя, установленного на’ входе интегратора, а при преобразовании входного сигнала в частоту весовую функцию реализуют пу- 20 тем использования делителя с управляемым коэффициентом пересчета,установленного на входе счетчика,подсчитывающего импульсы этой частоты за заданный промежуток времени [2] .There is a method of analog-to-digital conversion, in which the weight function is realized by multiplying the signal by a time-varying coefficient 15 using a controlled resistive divider installed on the integrator input, and when converting the input signal to frequency, the weight function is realized by using a divider with controlled conversion factor installed at the input of the counter, counting the pulses of this frequency for a given period of time [2].

Недостатком этих способов является низкая точность преобразования.The disadvantage of these methods is the low accuracy of the conversion.

Целью изобретения является повышение точности преобразования. 30The aim of the invention is to increase the accuracy of the conversion. thirty

Указанная цель достигается тем,. что по способу аналого-цифрового преобразования, основанному на двух-. . тактном интегрировании входного и опорного сигналов, включающего преобразование входного напряжения в ряд токов, их интегрирование в первом такте в течение равных промежутков времени до операции интегрирования во втором такте опорного сигнала, осуществляют преобразование опорного напряжения в ряд токов, число которых равно числу токов в первом такте интегрирования; суммируют их и устанавливают попарно равными коэффициенты преобразования между токами в первом и втором тактах интегрирования.The specified goal is achieved by. that according to the method of analog-to-digital conversion based on two. . integration of the input and reference signals, including the conversion of the input voltage into a series of currents, their integration in the first cycle for equal periods of time before the integration operation in the second cycle of the reference signal, the reference voltage is converted into a series of currents, the number of which is equal to the number of currents in the first cycle integration; summarize them and set the conversion factors between the currents in pairs in the first and second integration steps in equal pairs.

Структурная электрическая схема устройства, реализующего способ, приведена на чертеже.Structural electrical diagram of a device that implements the method shown in the drawing.

Устройство содержит переключатель 1, интегратор 2, блок 3 управления, преобразователи 4-6 напряжения в ток и ключи 7-9.The device comprises a switch 1, an integrator 2, a control unit 3, voltage-to-current converters 4-6 and switches 7-9.

С помощью переключателя 1 на вход интегратора 2 через один или несколько преобразователей 4-6 может быть подано входное и_9< или опорное U_o напряжение. Выходной сиг-* нал интегратора 2 поступает на вход блока 3, который управляет переключателем 1 и ключами 7-9.Using switch 1 to the input of the integrator 2 through one or more converters 4-6 can be applied to the input and _{9 <} or reference U _o voltage. The output signal * of integrator 2 is fed to the input of block 3, which controls switch 1 and keys 7-9.

В первом такте интегрирования производится интегрирование с заданной весовой функцией входного сигнала и₆₎₍ (t). При этом переключатель ³1 находится в верхнем положении, а весовая функция реализуется путем замыкания в определенной последовательности ключей 7-9. При этом одновременно может быть замкнуто несколько ключей, но необходимо,чтобы на протяжении первого такта интегрирования, каждый из ключей был замкнут одно и тоже время.In the first integration step, integration with the specified weighting function of the input signal and _{6) (} (t) are performed. In this case, the switch ³ 1 is in the upper position and the weighting function is realized by closing in a certain sequence of keys 7-9. At the same time, it can be closed several keys, but it is necessary that during the first integration step, each of the keys be locked at the same time.

Во втором такте производится интег-15 рирование опорной напряжения ио.При этом переключатель 1 находится в нижнем положении. Во втором такте параллельно работают все преобразователи напряжение-ток, для чего на время 20 второго такта замыкаются все ключи.In the second step, the integration of the reference voltage is performed. In this case, switch 1 is in the lower position. In the second cycle, all voltage-current converters work in parallel, for which all the keys are closed for the time 20 of the second cycle.

Общая точность преобразования не зависит от точности преобразователей напряжение-ток.The overall accuracy of the conversion is independent of the accuracy of the voltage-current converters.

Claims

The invention relates to computing and can be used in the construction of digital noise protected voltmeters and analog-digital converters. There is a method of analog-digital conversion based on two-stroke integration, with the introduction of a special weight function when integrating the converted signal g. There is a method of angular-digital conversion, in which the weighting function is realized by multiplying the signal by the time-dependent coefficient by using a controlled resistive divider installed at the integrator input, and when converting the input signal to the frequency, the weighting function is implemented using the divider control The recalculation coefficient, set at the input of the counter, which counts the pulses of this frequency for a specified period of time 2J. The disadvantage of these methods is low conversion accuracy. The aim of the invention is to improve the conversion accuracy. This goal is achieved by which is an analog-to-digital conversion method based on two-. integrating the input and reference signals, including converting the input voltage to the current currents, integrating them in the first cycle for equal periods of time before the integration operation in the second clock of the reference signal converts the reference voltage to a number of currents, the number of which is currents in the first cycle of integration; summing them up and setting the conversion ratios between the currents in the first and second integration cycles in pairs equal to each other in pairs. The structural electrical circuit of the device implementing the method is shown in the drawing. The device comprises a switch 1, an integrator 2, a control unit 3, voltage to current converters 4-6, and switches 7-9. Using switch 1, input Ugy or reference and voltage can be supplied to the input of integrator 2 through one or several converters 4-6. The output signal of the integrator 2 is fed to the input of the block 3, which controls the switch 1 and the keys 7-9. In the first integration cycle, integration is performed with a given weighting function of the input signal Uj (t). In this case, the switch 1 is in the upper position, and the weight function is realized by locking in a certain sequence of keys 7-9. At the same time, several keys can be closed at the same time, but it is necessary that each of the keys be closed at the same time during the first integration cycle. In the second cycle, the reference voltage is integrated. The switch 1 is in the lower position. In the second cycle, all voltage-current converters operate in parallel, for which all keys are closed for the time of the second cycle. The overall conversion accuracy does not depend on the accuracy of the voltage-current transducers. Analog-to-digital conversion method based on push-pull integration of the input and reference signals, including converting the input voltage into a series of currents, integrating them in the first cycle for equal periods of time, in order to improve the accuracy of the conversion, before the integration operation, in the second cycle of the reference signal, the reference voltage is converted into a series of currents, the number of which is equal to the number of currents in the first integration cycle, summarize them and set vayut pairwise equal conversion factors between the currents in the first and second integration cycles. Sources of information taken into account in the examination 1. The author's certificate of the USSR, cl. G 01 R 23/10 1970.

2.UK patent number 1276137 N ki G 4 G, published. 1976 (prototype) °.

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