# Archangelsky converter

(57) Abstract:

The invention relates to measuring technique and can be used as a functional Converter to calculate the values of the functions arc tgk when k<1. The aim of the invention is to enhance the functionality while simplifying the structure of the Converter. This goal is achieved by the fact that the approximation is carried out in a range of angles from 0 to 4, which allows you to apply simple approximating function that was easy to do. The Converter comprises a controlled amplifier, an adder and a reference voltage. Used, an approximate function allows you to simplify the Converter, to provide a large dynamic range of input signals, high-speed, low truncation error of about 0.15^{o}and low instrumental error, which does not exceed methodical. 1 Il. The invention relates to measuring technique and can be used in various functional converters, when you are defining values arctan To high speed, low accuracy and ease of implementation in some interval of values of the argument.

atory, blocks of summation and subtraction of the voltage, the memory block, the block nonlinear correction, switches, and flow calibration. Its work is based on the approximation argument functions, logarithmic functions, orthogonal components.

The device is quite complex in design, has a low performance.Know another device analog transnova Converter containing two resistors with zeropressure conductivity, resistor to zeropressure resistance and an operational amplifier.The device requires the use of complex digital devices, which in combination with the analog signals irrational.Known trigonometric functional converters time-pulse action based on the formation time intervals using a harmonic reference signal, for example, similar to the device in which to obtain the output signal, proportional to the value of arctan (z/x), use two balanced modulator, an adder and a comparator.The device is quite simple in execution, but has low speed.Know another device containing the adders S="ptx2">The device is quite simple to implement, has low performance when using diodes in the feedback circuit of the logarithmic amplifiers, this type of approximation gives a large error 0.7^{about}to change interval argument from zero to 4.The closest General technical characteristics is functional Converter comprising the sensor signals, the controlled amplifier, adder, a controlled voltage reference, block Comparators, operational amplifier with adjustable feedback circuit with corresponding connections. The device performs automatic selection of the gain block when the deviation of the characteristics of the sensor from the linear law, however, does not allow the necessary trigonometric transformation.The aim of the invention is to enhance the functionality while simplifying the structure.This is achieved by the fact that in arctangent Converter containing an adder, a controlled amplifier and voltage reference, the output of which is connected to the first input of the adder, the information input of the control amplifier is the input of the Converter, the second input of the sum is d which is the output of the Converter.The essence of the invention lies in the fact that with limited argument value, for example To < 1, the approximation can be done with a simple function with high precision, specifying select this function in the following form:

arctan K K f(k) for K < 1, (1) where the value of the argument;

f(k) and A K to f(k) < 1;

f(k) 1 f(k) 1;

A and the coefficients chosen from the condition of minimization of the approximation error.The drawing shows a structural diagram Arkhangelskoe Converter.It comprises a controlled amplifier 1, an adder 2, the voltage reference.Blocks in arctangents the Converter is connected as follows. The input of the Converter is connected to the information input of the control amplifier 1 and the second input of the adder 2. The first input of the adder 2 is connected to the reference voltage U

_{op}. The output of the adder 2 is connected to a second managing input of the control amplifier 1. The output of the controlled amplifier 1 is connected to the output Arkhangelskoe Converter.Archangelsky the Converter operates as follows.Input voltage U

_{x}corresponding to the value of the argument It comes to information/SUB> from the source of reference voltage. The value of U

_{op}choose in accordance with the following expression:

U

_{x(max)}K

_{(max)}U

_{op}(2) the Voltage U

_{op}when K

_{(max)}1 is chosen equal to the maximum output signal, that is, U

_{op}U

_{x(max)}. At the output of the adder 2 receive the voltage U

_{2}that depends on the voltage U

_{x}. The voltage U

_{2}from the output of the adder 2 controls the gain of the controlled amplifier 1. This voltage U

_{2}is defined by the following dependency:

U

_{2}U

_{c}C U

_{x}for all voltages U

_{x}when U

_{2}< U

_{2max}and

U

_{2}U

_{2max}for all other values of U

_{x},

where U

_{c}A U

_{2max}and With a U

_{2max}/U

_{op}the coefficients A and A are chosen in accordance with (1);

U

_{2max}the voltage at which the gain controlled amplifier 1, is equal to the unit. In this case, for simplicity, let us assume U

_{2max}U

_{op}.The condition U

_{2}U

_{2max}can be performed in different ways, for example by using the output stage with a limitation in the adder 2, so the cascade restrictions on the structural diagram is not shown and not a separate unit.Thus, MK U

_{x}/U

_{op}you can write

U

_{2}U

_{2max}(A aK). (4) This voltage U

_{2}is supplied to the control input of the control amplifier 1. The transmission coefficient of this controlled amplifier 1 is controlled using the voltage U

_{2}coming from the output of the adder 2. This voltage has a value in accordance with expressions (3), (4), so the output voltage can be written as follows:

U

_{1}U

_{o}U

_{x}f(k), (5) where U

_{x}U

_{op}K and f(k) A aK.Consequently, the received expression in accordance with (1).U

_{1}U

_{o}arctan K K U

_{op}f(k) for U

_{x}/U

_{op}where f(k) A-aK f(k) < 1;

f(k) 1 f(k) 1;

A and the coefficients chosen from the condition of minimization of the approximation error.I.e. arctan K [( /4)/U

_{op}]U

_{o}( /4) K f(k), where U

_{x}/U

_{op}the argument value of 0 To 1.0.The approximation error of q can be obtained from the following expression: q 1 [K(A aK)/arctgK] To 1.For example, when A 1,075 and 0.29 error q in dependence from 0 To 1 will change from 0 to 0.3

^{about}therefore, the truncation error will be equal to q/2 i.e. 0,15

^{about}. Instrumental error of the device will not exceed metodicheskoe implementation is not difficult.The proposed Converter is very simple, consists of two operational amplifiers, one of which is used as an adder in the feedback circuit which includes a Zener diode, and the other OS is used as an adjustable amplifier, the maximum transmission coefficient of each block does not exceed one, so U

_{o}can vary in a wide range of input signals. ARCHANGELSKY CONVERTER comprising an adder, a controlled amplifier and voltage reference, the output of which is connected to the first input of the adder, the information input of the control amplifier is the input of the Converter, characterized in that in it the second input of the adder is connected to the input of the Converter, and the output connected with the control input of the control amplifier whose output is the output of the Converter.

**Same patents:**

_{1}= arcsin x,

_{2}=arccos x, and various analog computing devices

**FIELD: computer engineering; automation, data processing and measurement technology.**

**SUBSTANCE: proposed converter has two registers, NOT gate, angle-code-to-sine/cosine-code functional conversion unit, two digital-to-analog converters, reference voltage supply, pulse generator, counter, two capacitors, subtracting amplifier, two modulators, threshold unit, two selector switches, two buffer followers, threshold voltage supply, comparison circuit, D flip-flop, and reference code shaper; all these components enable functional control of converter during recording pulse time and supply of signal indicating normal or abnormal operation of converter to user thereby essentially raising its self-control ability and yielding profound and reliable information.**

**EFFECT: enhanced comprehensiveness of control and reliability of converter output data.**

**1 cl, 2 dwg**

FIELD: computer engineering, in particular, functional transformers of angle code to sine-cosine voltages, possible use in data processing systems.

SUBSTANCE: device contains block for functional transformation of angle code to code of sine and cosine, generator of impulse pack, NOT element, registers, support voltage source, digital-analog converter, switch, capacitors, buffer repeaters, modulators, threshold block.

EFFECT: increased precision of transformation.

2 cl, 2 dwg

FIELD: physics, computer engineering.

SUBSTANCE: invention relates to computer engineering, specifically special-purpose computers. The technical result is achieved by a device for calculating trigonometric functions, which comprises sine and cosine registers, increment registers of the same values, two converters for converting direct code into complementary code, connected, besides by connections between said units, with a clock pulse generator, a memory unit and an argument counter.

EFFECT: method of removing limitations on an argument of calculated functions in the range from 0 to + when calculating trigonometric functions.

1 dwg