SU634305A1 - Functional generator - Google Patents

Description

This invention relates to analog computing.

Functional converters are known which contain an operational amplifier with a diode-resistive circuit at the input, which can be used to reproduce the function of a module with a dead band flj. However, the width of the dead zone of such a converter depends substantially on temperature, which is caused by the temperature drift of the voltage drop across the diodes.

Closest to the proposed invention is a functional converter containing an bias voltage source, an operational amplifier, the limiting diode of which is connected to the output of the operational amplifier, and the cathode is the output of the converter, a feedback resistor connected between the input of the operational amplifier and the cathode of the limiting diode, a bias resistor connected between the inputs of the operational amplifier and the positive

the output of the bias voltage source, the input resistor, the first output of which is connected to the input of the operational amplifier, and the second output is the input of the G21 converter; the disadvantage of such a device that reproduces the deadband is limited functionality, since it cannot be used for playback function module.

The purpose of the invention is to enhance the functionality by reproducing the function of the module with the dead zone.

This is achieved by the fact that the negative terminal of the bias voltage source is connected to the output of the operational amplifier.

FIG. 1 is a diagram of the proposed functional converter; in fig. 2 - the characteristic of the converter.

Claims (2)

The functional converter includes an operational amplifier 1, an input resistor 2, a limiting diode 3, a feedback resistor 4, a bias voltage source 5, a bias resistor 6. Functional Converter works as follows. When diode 3 is closed, the output of the function converter is connected only to the input of amplifier 1. The voltage at the input of the operational amplifier covered by negative feedback is practically zero. The state of the converter, when the diode 3 is closed and the amplifier 1 is in the linear mode, corresponds to the deadband on the characteristic of the functional converter. With positive input signals, the signals are large ((E (-h-V.). Where Iv2 and R are the resistances of resistors 2 and 4; the lower limit of the op amp 1, H is the bias source 5, the op amp 1 is saturated, inverse the connection is released and the input voltage is no longer equal to 0. It is determined by the combined effect of the input signal and the saturation voltage of the operational amplifier 1. Since diode 3 is closed, the output voltage of the function converter is proportional to the input voltage by a factor of T / (R A) deT - resisted e of resistor 6, With negative input signals smaller than T 2/1, (), where And the direct voltage drop across diode 3, q and one 3 opens, and the transfer coefficient of the converter is 2 () The position of the break points on the characteristic of the converter and transfer coefficients outside the zone of insensitivity allow adjustment within wide limits. In particular, when the resistances of resistors 2 and 4 are equal, with an appropriate choice of magnitude, a symmetrical characteristic can be obtained. In this case, the coordinates of break points bodies identified R. E /. boosters: 7, whence WHAT, with stability and large, compared with iJg, the value of E /) is the effect of temperature drift. For example, on diode 3 in the proposed scheme, it can be significantly weakened. The limiting levels of some Sovre of the integrated integral operational amplifiers have a high temperature stability, which allows to significantly reduce the relative change in the size of the transducer's non-sensitivity zone in the temperature range. As the source 5 of the voltage of the room, any known level bias circuit can be used having the appropriate parameters. In a row, the source 5 can practically be realized as two series-connected resistors connected between the output of the operational amplifier 1 and the power source, and the resistor connected to the output of the amplifier 1 must be bridged by a capacitor. Thus, the proposed functional converter allows one to extend the functionality of the known by reproducing the function of the module with the deadband without additional hardware costs. The use of the proposed device in blocks of nonlinear functions of analog computing devices and in nonlinear components of automatic control systems allows a significant reduction in equipment size and power consumption, since a functional converter implemented on three operational amplifiers is usually used to realize the function of a module with a dead zone. . Claims of the Invention A function converter comprising an bias voltage source, an operational amplifier, a limiting diode whose anode is connected to the output of an operational amplifier, and a cathode is the output of a converter, a feedback resistor connected between the input of the operational amplifier and the cathode of the limiting diode, a bias resistor connected between the input of the operational amplifier and positive iodine of the bias voltage source, the input resistor, the first output of which is connected to the input of the opera amplifier, and the second output is the input to the converter, which is so that, in order to expand the functional possibilities by reproducing the function of the module with the dead zone, the negative terminal of the bias voltage source is connected to the output of the operational amplifier. Sources of information taken into account in the examination: 1, USSR Author's Certificate No. 429364, cl. Q 01 I 19/22, 1974. 2. Patent of France hfc 1603729,  cl. q On Q 7 /, 26, 1971.