SU1345214A1 - Device for automatic selection of amplification factor - Google Patents

Abstract

The invention relates to amplifying devices with a large gain control range and can be used in analog computers. The aim of the invention is to expand the range of the gain control. The device for automatic selection of the gain factor comprises a signal sensor 1, an amplifier unit 2 with a controlled gain factor, an adder 3, a control source 4 of reference voltages, a comparator unit 5, an output 6, an operational amplifier 7, an adjustable feedback circuit 8. The operation of the device is based on the automatic selection of the gain of the amplifier unit 2 depending on the magnitude of the deviation of the characteristic of the sensor 1 signal from the linear law 2 or less. and S (L

Description

The invention relates to amplifying devices with a large range of gain control and can be used in angular computers.

The purpose of the invention is to expand the range of adjustment of the gain

Fig. 1 shows a functional diagram of an apparatus for automatically selecting a gain factor; FIG 2 - a graphical process for converting a non-linear characteristic of a device

The device comprises a signal sensor 1, an amplifying unit 2 with a controllable coefficient, an adder 3, a controlled source 4 of a voltage source, a comparators unit 5, an input 6, an information amplifier 7, an adjustable feedback circuit 8.

The device works as follows.

Suppose that the dependence of the voltage at the output of sensor 1 of the signals on its input parameter U is nonlinear (Fig. 2, curve I) and it needs to be linearized (Fig. 2, direct II). To do this, in the step of tuning, curve I is broken down into segments ab, b, c, d, d, e, ee, e-f, each of which is approximated by a straight line. The operation of the device is convenient to install in stages. The number of stages is determined by the number of approximating segments.

Let it be necessary to linearize the section 0-abb-in curve I of figure 2. This is carried out in two stages. At the first stage, the linearization of the 0-a-b section is achieved by applying voltage from the output of sensor 1 to the first informatioin input of the amplifying unit 2. At the output 6, the voltage reaches the level U ,, and triggers one of the comparators of the comparators 5, the output voltage of which affects the control input of the controlled source of the reference voltage A and the control input of the amplifying unit 2, which is made on the operational amplifier 7 with an adjustable feedback circuit 8,

. Formed voltage Ugy. The second output of the controlled source 4 reference voltages is fed to the input of the adder 3, the coefficient ne

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the reduction of which is equal to one. The second information input of the amplifier unit 2 of the third output of the controlled source 4 is the reference voltage-- the scientific research institute receives a voltage that allows the output voltage of the amplifier unit 2 to be reduced to zero. Then, the gain of the amplifying unit 2 is changed by the value determined by the angle cJ- (Fig. 2) by adjusting the parameter of the adjustable feedback circuit 9, which makes it possible in sections 0-a-b to ensure the gain constant and, therefore, linearize this site.

At the second stage of linearization of the 0-a-b-b section, the work proceeds as follows.

When the voltage at output 6 reaches the level J,, the next comparator of the Comparators block 5 is triggered, the output voltage of which affects the control source 4 of the reference voltages and the control input of the amplifier block 2. The generated voltage id; g. equal source 4 opn;; voltage comes to adder 3. At 7 input of the amplifier unit 2 s. the third output of the controlled source 4 of the reference voltage, the generated voltage enters, allowing to reduce the output voltage of the amplifier unit 2 to zero. Then, the gain of the amplifying unit 2 is changed, determined by the angle p (figure 2), which allows to provide an immeasurable gain in areas 0-a-b-b, and therefore linearize this section. The linearization of the 0-ab-b-d region and the subsequent steps are performed in a similar manner.

The proposed device for automatic selection of the coefficient of amplification is characterized by a wide range of adjustment of the gain, which allows its use with a large class of screen sensors with nonlinear characteristics.

Claims (1)

Formula invent; neither An apparatus for automatically selecting a gain factor comprising a signal sensor whose output connected to the first information input of an amplifier unit with a controllable gain factor, and a comparators unit, characterized in that, in order to expand the range of the gain control, an adder and a controllable source of reference voltages are inserted into it, and the output of the amplifier unit with a controllable factor gain is connected to the first input of the adder, the output of which is the output of the device and connected to the first input a comparators unit, the output of which is connected to the control inputs of the amplifying unit with a controlled gain factor and a controlled source of reference voltages, the first and second outputs of which are connected respectively to the second inputs of the adder and the comparator unit, the third output of the controlled source of reference voltages is connected to the second information input of the amplifying unit with a controllable coefficient; UBt, Df, Editor I. Casard Compiled by O. Otradnov Tehred L. Serdyukova Order 4922/48 Circulation 670 Subscription VNIIPI USSR State Committee for Inventions and Discoveries 113035, Moscow, Zh-35, Raushsk nab., D. A / 5 Production and printing company, Uzhgorod, Projecto st., 4 cpue.Z Corrector S.Cherni