SU847331A1 - Function generator - Google Patents

Description

(54) FUNCTIONAL CONVERTER

one

The invention relates to computing and can be used for the functional conversion of ancross signals.

A functional transducer is known, which contains functional units for generating members of a row, approximating a simulated function, to the outputs of which amplifiers with adjustable transmission coefficients are connected, storage elements and a summing unit, in which the voltage-to-pulse-frequency converter controls the functional blocks through a delay element the members of the row, and the gain control ratio of the amplifiers is carried out by the control unit M e

The disadvantages of this converter are the limited reproduction of a given function due to a constant synchronization period, and the reproduction accuracy of a given function is low due to the considerable integration time of the integrators, which increases with the degree of approximating polynomial.

Most (The closest device proposed is a converter consisting of a series of series-connected integrating amplifiers, to the corresponding outputs of which potentiometers are connected via inverters, the sliders of which are connected to the corresponding inputs of the adder. The output of the adder is connected to the comparison device. The output of the comparison device

fO through a matching amplifier, an electronic switch and a cathode cascade connected to the output of a trigger producing rectangular pulses and the input of a conversion trigger,

15 the output of which is connected to the electronic key IT. .

The disadvantages of this converter are limited capabilities due to the saturation of integrators

20 and the impossibility of automatically changing the type of functional dependence due to the presence of uncontrollable potentietlets & s and the limited accuracy due to the constant sampling rate of a given function.

The purpose of the invention is to increase the accuracy of the class of reproducible dependencies.

The goal is achieved by the fact that a functional converter containing connected integrating amplifiers, reset keys, connected parallel to the capacitors of the integrating amplifiers, amplifiers with controlled transmission coefficient, the output of each of which is connected to the corresponding input of the adder, the converter is inserted extension to frequency, delay element, information transfer cries and gain setting unit, output connected to control inputs Odamplifiers with controllable transmission coefficient, the inputs of which are connected to the outputs of the respective ontegators via information transfer keys, the control inputs of information transfer keys are connected to the output of a voltage-to-frequency converter connected via a delay element to the control inputs of reset keys.

The drawing shows the block diagram of the functional Converter.

The functional converter contains integrating amplifiers 1, made on amplifiers 2 of direct current, resistors 3 and capacitors 4, reset keys 5 connected in parallel with capacitors of integrating amplifiers, information transfer keys 6 connected to amplifiers 7 with controlled transmission ratio, storing elements 8, the delay element 9, the voltage converter 10 to the pulse frequency, the adder 11 and the amplifier coefficient setting unit 12.

The Converter operates as follows.

When applying a constant voltage to the input of the converter at the output of each nth integrating amplifier 1, a voltage of the form

you, n UD- t At the time of applying voltage

At the converter input to the pulse repetition frequency (PNC 10, pulses appear at its output, the frequency of which is direct (inversely proportional to the input signal. Signals from the output of the IFC 10 control the information transfer keys, and through the delaying element 9 using reset keys 5 At the time of closing the keys of the information transfer on the storage elements 8, the voltages corresponding to the voltages on the outputs of the amplifiers 1 are fixed. Since the closures of the closures of the information transfer keys 6 are proportional to the input voltage, then The output at the output of the corresponding recording “1st element 8 at the moment of locking the keys 5 has the form

Ui n-K-Uo-L Sc (- oU 7R After the elements 8 memorize the information, delay element 9 outputs a signal to turn on the reset keys, so that the capacitors of the integrating amplifiers break. The converter is ready for the new operation cycle. At the output of the adder 11

8s.)

which is a given functional dependence on the input value Ug, (.

If it is necessary to change the type of functional dependence, the block 12 of the task of gain factors gives signals for changes in the gain factors of amplifiers 7.

Since the output signal of the proposed converter is a discretely variable signal with a variable sampling step, functionally dependent on the input voltage, unlike the amplitude modulated pulse signal in a known device, the proposed converter provides a much more reliable reproduction of a given functional dependence. The method of retrieving information from each integrating amplifier, storing it at times, proportional (inversely) to the input signal and subsequent summation, is more noise-proof than the method of applying continuously changing signals to the input of the adder and subsequent storing the sum signal at times proportional to the input voltage

The introduction of reset keys allows to significantly reduce their operating time in the playback mode of the function, which leads to an accuracy of the converter operation.

The use of amplifiers with an adjustable gain factor and a block of setting the gain factors allows changing the type of functional dependence in time, or programmatically, thus achieving an extension of the class of reproducible dependencies.

Claims (1)

Invention Formula Functional converter containing serially connected. integrated integrators, reset switches connected in parallel to the capacitors of the integrating amplifiers, amplifiers with control of the transfer coefficient, output