RU1833863C - Sine function generator - Google Patents

Abstract

The invention relates to analog computing. The aim of the invention is to increase the accuracy of the converter without increasing hardware costs. The converter contains two three-input inverting adders

Description

The invention relates to analog computing and can be used in the construction of special computers, ADCs, etc. to calculate the sln (P1 / 2X) value at the output of the device when the value of Xn is applied, the input of the device is in the range from 0 to 1.

The aim of the invention is to increase the accuracy of the converter without increasing hardware costs.

The goal is achieved in that in a functional sine converter, both non-inverting smart multipliers are replaced by inverting ones, and both two-input non-inverting Tms adders are replaced by three-input inverting ones.

The novelty of the claimed invention is due to the fact that a fundamentally different circuit solution was used to obtain the result: the circuit elements were replaced, the connections between the elements were changed, and the weight coefficients were chosen differently.

This embodiment of the device allows to reduce the maximum error of the converter. In the worst case, at X 0.05424424, it has a value of 0.0011457% of the whole scale.

The increase in accuracy is due to the fact that the function sin (P1 / 2 X) is approximated by the formula

 1.571283 - 0.1180807 x - 0.358186 x2

1 - 0.07108679 x + 0.1661036 x2 according to the criterion of the best uniform approximation at 0 X 1.

In FIG. 1 shows a block diagram of a converter; in FIG. 2 is a graph of the theoretical error of the converter over the entire operating range of input voltages.

The inventive functional sine converter comprises a three-input inverting adder 1. Inverting multipliers 2 and 3, an inverter 4 and a three-input inverting adder 5.

00 SE CO 00

oh co

The input of the converter is connected to the first adder 1 and the control inputs of the multipliers 2 and 3, the output of the adder 1 is connected to the first input of the multiplier 2 and the third input of the adder 5, the output of the multiplier T is connected to the first input of the multiplier 3, the second input of the adder 1 and the second input of the adder 5, the output of the multiplier 3 is connected to the third input of the adder 1 and the input of the inverter 4, the output of the inverter 4 is connected to the first input of the adder 5, the output of which is the output of the converter.

The device operates as follows: the input voltage of the converter is supplied to the first input of the adder 1 and the control inputs of the multipliers 2 and 3, the signal from the output of the adder 1 is fed to the first input of the multiplier 2 and the third input of the adder 5, the output signal of the multiplier 2 is fed to the first input the multiplier 3, the second input of the adder 1 and the second input of the adder 5, the signal from the output of the multiplier 3 is fed to the third input of the adder 1 and the input of the inverter 4, from the input of the inverter 4. the signal is fed to the first input of the adder 5, from the output of which you can remove the output signal function generator.

Using the device according to the described invention allows to increase the accuracy of the converter by 8.2 times without increasing hardware costs compared to the prototype and to obtain the value of the sin (P1 / 2 X) function in the worst case with an accuracy of 0.0011457% of the whole scale, which is clearly illustrated by the graph shown in FIG. 2.

Claims (1)

SUMMARY OF THE INVENTION A functional sine converter comprising two adders, two multipliers and an inverter, wherein the input of the converter is connected to the first input of the first adder and the first input of the first multiplier, the output of the first multiplier is connected to the first input of the second multiplier, the output of the second multiplier is connected to the input of the inverter, the output of the inverter connected to the first input of the second adder, the output of which is the output of the converter, characterized in that, in order to improve accuracy, the adders and multipliers in it are filled with inverters, and the input of the converter is connected to the second input of the second inverting multiplier, the output of the first inverting adder is connected to the third input of the second inverting adder and the second input of the first inverting multiplier, the output of the first inverting multiplier is connected to the second inputs of the first and second inverting adders a multiplier is connected to the third input of the first inverting adder. Cha  x ffiF77Pff573 G. ... ,, jt rt0ff07 0.7 f sfoze 0.758 / 86 it pye.i Cb h xa j. N V; “S“ S S “S  N f fe Ch & “Ch     G G Z-0 / SVWSJn J &# 0 e / 0 u / J & s afe04 / # & // / / gff6e / J A /