SU1304037A1 - Device for determining gain factor of operational amplifiers - Google Patents

Abstract

The invention relates to analog computing and can be used in systems for the automated control of the parameters of operational amplifiers. The purpose of the invention is to increase accuracy and speed. The device for determining the gain of the operational amplifiers contains a source of reference voltage 1, three scaling elements 2-4, a digital-controlled resistor 5, an analog-digital converter 6, a balancing resistor 7, a controlled operational amplifier 8, a storage register 9, a division block 10, a multiplier 12, the scale unit 13, the readout unit 14 and the switch 15. With the control of each operational amplifier, the switch 15 is set to the operating position and the analog-to-digital change is made by the former 6, only one voltage U (at the junction of the scaling elements 2-4. or S (L CA5 O 4 O CO -sj

Description

The invention relates to analog computing technology and can be used in automated control systems for the parameters of operational amplifiers.

The purpose of the invention is to improve accuracy and speed.

The drawing shows a block diagram of a device for determining the gain of operational amplifiers.

The device contains a source of reference voltage 1, three scaling elements 2-4, a digital-controlled resistor 5, an analog-digital converter 6, a balancing resistor 7, a controllable operational amplifier 8, a memory register 9, a division unit 10, a scale setting input 11 devices, a multiplier 12, a scale unit-13, a block 14 of subtraction and a switch 15.

The device works as follows.

At the output of the scale unit 13, the scale factor M required for measuring this type of controlled operational amplifier 8 is set. The signal from the output of the scale unit 13 in the parallel binary code is fed to the control input of the digital controlled resistor 5, setting the value of its resistance, ensuring the ratio

RJ + RB (1)

M

Where

3 "5

40

- resistance of the scaling 3 and digitally controlled 5 resistors. Before starting the measurement, the switch 15 is reset. The output of the reference voltage source 1 is set to the voltage U, the value of which is measured once before the start of monitoring and is kept stable for the entire batch measurement time. When each operational amplifier is monitored, the switch 15 is set-50 is injected into the operating position, and only one voltage is measured by the analog-digital converter 6. At the junction point of the scaling resistors 2,3 and 4, its rank is determined by the ratio

A device for determining the gain of the operational amplifiers, comprising a first, second and third scaling resistors, a reference voltage source, a switch and a balancing resistor, the output of the reference voltage source being connected via the first scaling resistor to the first outputs of the second and third scaling resistors, the second terminals of which are connected respectively to the inverting input and the output of the controlled operational amplifier, the non-inverting input of which through symmetrize A connecting resistor is connected to the zero potential bus, and the first and second inputs of the switch are connected respectively to the first and second terminals of the first scaling resistor, which connects to that.

and

M

k, + k, m

and

that, in order to improve accuracy and speed, a digital-controlled resistor, an analog-to-digital converter, a storage register, a multiplier, a dividing unit, a subtraction unit and a large-scale unit were entered into it, with the output of the switch connected to the input of the analog-digital converter whose output connected to the first input of the dividing unit and through the memory register to the second input of the dividing unit, the digitally controlled re- R - 55 P is connected between the zero potential bus and the inverting input of the controlled operational amplifier, the control input of the digital direct current resistor, the input of the large-scale

Letter 8, K -1+

where K is the gain of the controlled operational force. . R

R

V

Voltage U is transformed by the smooth form of an analog-to-digital converter 6, then the result of dividing from the output of dividing unit 10 to the input of multiplier 12, which is produced

+ 1-

 .

in tsifi n and, the output signal

and,

M

and

  M,

This signal is fed to the input of subtraction unit 14, to another input from which the output of the block of scale unit 13 is given a signal, and the required value K is obtained at the device output.

Claims (1)

20 claims A device for determining the gain of the operational amplifiers, comprising a first, second and third scaling resistors, a reference voltage source, a switch and a balancing resistor, the output of the reference voltage source being connected via the first scaling resistor to the first outputs of the second and third scaling resistors, the second terminals of which are connected respectively to the inverting input and the output of the controlled operational amplifier, the non-inverting input of which is symmetrized through A connecting resistor is connected to the zero potential bus, and the first and second inputs of the switch are connected respectively to the first and second terminals of the first scaling resistor, which connects to that. 3 13040374 the block and the first input of the subtractor multiplier, the second block input is connected to the scale input, or connected to the output of the scaler, the second input multiply the block, and the output of the video block is connected to the first input of the block.