SU1056221A1 - Function generator - Google Patents

Abstract

FUNCTIONAL GENERATOR, containing an operational amplifier, integration capacitor, two sources of stepped voltages, two current-leading resistors and a key, where the sources of stepped voltages are connected to the common output of the key and the integrated capacitor, and the output of the amplifier is connected torus generator, different teM. that, in order to increase the accuracy and expand the class of reproducible functions, it introduced a clock pulse generator, an additional source of step voltage, a resistive voltage divider and a large-scale resistor, and the non-inverting input of the operational amplifier is coupled with a common VIVRDS4 key and an integrating co-deasator and large-scale resistor - with its output, inverter ||| 1st input is connected to the middle terminal of the resistive voltage divider whose extreme terminals are connected respectively to the output of the This amplifier and a zero potential bus, free servo and control key input are connected respectively to an additional CTjmeH4aToro voltage source and clock generator, and the free output of the integrated capacitor is connected to the zero potential bus.

Description

This invention relates to the field of technology,

Known functional generator containing a multi-phase multi-vibration integrator, .click, and an analog storage device, the principle of operation of which is based on the summation of triangular pulses l) "

The drawbacks of the device are low accuracy, each section of the approximation is reproduced as a result of the addition of two triangular functions, and the lack of input means for non-zero initial values of the function. ,

The most technical inventive nature of the invention is. functional generator containing an operational amplifier, integrating capacitor, two sources

step voltages, two current-measuring {Eesistor and a key, with step-voltage voltages being applied via corresponding current-supply resistors connected to the junction terminal of the key and the integrating capacitor connected to the feedback circuit of the operational amplifier, and the output of the operational amplifier is output function generator.

The disadvantages of the known functional generator are the possibility of introducing non-zero initial values, the function and the low accuracy of reproduction of the function, that. obus- . caught by the possibility of accumulating errors. of individual approximation sites “I.

The aim of the invention is to improve the accuracy to the expansion of the class of reproducible functions.

The goal is achieved by the fact that this functional generator contains an operational amplifier, an integrating capacitor, two sources of stepped voltages, two current supply resistors and a switch, the sources of stepped voltages 4 and the cutors corresponding to the current supply resistors are connected to the common output of the key and the integrating capacitor, and the output an operational amplifier is the output of a functional generator; a clock generator is introduced; an additional amplifier, a step voltage voltage, a resis, an active pulse. voltage divider and scale resistor, the non-inverting input of the operational amplifier of the connections with the common output of the key and the connecting capacitor and through the masigub resistor - with its output; the inverting input is connected to the middle output of the resistive voltage divider, the extreme outputs of which are connected respec- tively with you. an opamp with a zero potential bus, a free output and a control key input are connected

respectively, to the additional source of step voltage and the clock pulse generator, and the free output of the integrating capacitor is connected to the zero potential bus.

The drawing is a diagram of a functional generator.

The functional generator contains sources of 1-3 step voltages of current supplying resistors 4 and 5, a scale resistor .6, a resistive voltage divider on resistors 7 and 8, a clock generator 9, a switch 10, an operating amplifier 11, and an integrating capacitor 12.

The generator works as follows: ohm.

In the initial state, the voltage Ugx is not the output of source 1 and the voltage Ug at the output of source 2 is equal to nj, the voltage UBXJ at the output of source 3 is half the initial value of te reproduced, my function: Ugx3 0.5 fg. At the initial time point t4, the control pulse from the output of the generator 9 by opening et key 10 for a very short time interval during which the capacitor 12 infects from source 3 to the level UBX. In this case, the output voltage of the amplifier

RT

.rU, SI- :-) - Uj, 2i „., fe.

h „. :

If resistances of resistors 7 and 8

are the same Ry Re.

During the first interval of approximation of the output of the source 2 or 1, a constant level is determined which determines the inclination angle of the sawtooth voltage at the output of the device — the first link of the approximate linear circuit is formed (for a linear charge of the capacitor 12) 6 were related by RJs R 4- Well)

When t: t | the generator again oTKpHsaie key 10 for a short period of time. At this point, the output of the source 3 is set, constant voltage. Equal 0, 5 f; f, where f is the value of the reproduced function at. As a result, the voltage on the capacitor 12 becomes equal to U jj.j, and

at the output of the device - f,.

I, -,,.

During the second approximation interval, at the output of the generator 9, a second link of the polyline is formed, the slope of which is set by a constant level from the output of source 1 or 2.

the further formation of the approximating lscmana occurs as described.

Thus, in the proposed device, as well as in the known, a piecewise linear 10562 approximation of the reproducible function is realized by integrating step signals from the output of sources 1 2. However, the values of the output voltage at the approximation nodes are set directly by the large condensate -5 pa 12 from the source 3. Thanks to this. The integration error during the whole process does not exceed the error of forming one link of the broken line / which improves the accuracy of the generator 10. In addition to TorOf, source 3 allows you to set at the initial time nonzero voltage at the output of generator 9, which expands the class of playback functions. . The technical and economic effect is to increase the accuracy and. expanding the class of reproducible functions by introducing a clock generator of an additional source of a step, voltage, and scale resistor, which eliminated the accumulation of reproduction errors in individual sections of the function and reproduced fuiccin with nonzero initial values.

Claims (1)

FUNCTIONAL GENERATOR, comprising an operational amplifier integrating a capacitor; two step voltage sources; two current-carrying resistors and a key, and step voltage sources are connected through the corresponding current-carrying resistors to the common output of the key and the integrating capacitor, and the output of the operational amplifier is the output of the functional generator, which is the result of TeM. that, in order to increase accuracy and. expanding the class of reproducible functions, a clock generator, an additional step voltage source, a resistive voltage divider and a scaler, a resistor are introduced into it, and the non-inverting input of the operational amplifier is connected to the common output of the key and the integrating capacitor and through its large-scale resistor with its output ·, inverting the input is connected to the medium. to the output of the resistive voltage divider, the extreme terminals of which are connected respectively to the output of the operational amplifier and to the zero potential bus, the free output and the control input of the key are connected respectively to an additional source of 'step voltage' and a clock generator, and the free output of the integrating capacitor is connected to the bus zero potential. SU _mt 1056221> Masdelia 8, key in • I